CN104601883B - A kind of method and device of image taking - Google Patents

Abstract

The embodiment of the invention discloses an image shooting method and device. The method includes: when receiving a shooting instruction, controlling the first shooting unit to perform a focusing operation along a preset direction, and acquiring a first focusing parameter value; controlling the second shooting unit to perform a focusing operation in a direction opposite to the preset direction performing a focusing operation, and obtaining a second focusing parameter value; determining a focusing point of the terminal according to the first focusing parameter value and the second focusing parameter value; and completing the shooting action by using the focusing point of the terminal. The embodiment of the invention also correspondingly discloses an image capturing device. By adopting the embodiment of the present invention, the first photographing unit and the second photographing unit of the terminal perform focusing operations at the same time, so as to realize rapid focusing during the photographing process.

Description

Method and device for capturing images

technical field

The present invention relates to the technical field of image processing, in particular to an image capturing method and device.

Background technique

At present, most portable devices with camera functions, such as ordinary cameras, mobile phones, and tablet computers, usually use single-camera technology to capture images. The focusing process of devices using a single-camera is generally to find the clearest point by moving the position of the motor, and This position serves as the in-focus position. During the entire focusing process, the image on the photosensitive element in the device will change from blurred to clear and then to blurred, and then the motor will search in small steps to find the clearest position. Although the above-mentioned focusing method can achieve the focusing function, it takes a lot of time to repeatedly adjust the focus motor, which prolongs the image shooting time of the device, and cannot meet the requirements of fast focusing in image shooting for portable devices.

Contents of the invention

Embodiments of the present invention provide an image shooting method and device, which can realize fast focusing during the shooting process.

An embodiment of the present invention provides an image capturing method, which is applied to a terminal, and the terminal includes at least a first capturing unit and a second capturing unit, including:

When receiving a shooting instruction, control the first shooting unit to perform a focusing operation along a preset direction, and acquire a first focusing parameter value;

controlling the second shooting unit to perform a focusing operation in a direction opposite to the preset direction, and acquiring a second focusing parameter value;

determining a focus point of the terminal according to the first focus parameter value and the second focus parameter value;

The shooting action is completed by using the focusing point of the terminal.

Correspondingly, an embodiment of the present invention also provides an image capturing device, including:

The first acquiring unit is configured to, when receiving the shooting instruction, control the first shooting unit to perform a focusing operation along a preset direction, and acquire a first focusing parameter value;

The second acquiring unit is configured to control the second photographing unit to perform a focusing operation in a direction opposite to the preset direction, and acquire a second focusing parameter value;

a determining unit, configured to determine the focus point of the terminal according to the first focus parameter value and the second focus parameter value;

The execution unit is configured to use the focusing point of the terminal to complete the shooting action.

In the embodiment of the present invention, the first photographing unit and the second photographing unit of the terminal can perform focusing operations simultaneously, so as to realize rapid focusing during the photographing process.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic flowchart of an image capturing method provided by an embodiment of the present invention;

Fig. 2 is a schematic flow chart of another image capturing method provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an image capturing device provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another image capturing device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , which is a schematic flowchart of an image capturing method provided by an embodiment of the present invention, which is applied to a terminal, and the terminal includes at least a first capturing unit and a second capturing unit. The method includes the following steps:

S101. When a shooting instruction is received, control the first shooting unit to perform a focusing operation along a preset direction, and acquire a first focusing parameter value.

In a specific implementation, this embodiment can be applied to a device with a shooting function having two or more cameras, and the device with a shooting function may include a camera with two or more cameras, a mobile phone, a tablet computer, a notebook Computers, etc. The subject can be a portrait, or it can be a landscape, an object, etc. The terminal includes at least a first photographing unit and a second photographing unit, wherein the first photographing unit corresponds to a first group of cameras, and the first group of cameras may be one or more cameras fixed within the first area. The camera; the second shooting unit corresponds to the second group of cameras as the physical device, and the second group of cameras may be one or more cameras fixed within the range of the second area. The first area in the terminal can be bounded by the midpoint of the distance between the center of the lens and the center of the imaging plane, the first area and the second area are the positions on both sides of the center point, such as the area close to the lens is the first area , the area far away from the lens is the second area, or the area far away from the lens is the first area, and the area close to the lens is the second area. After locking the subject in the lens when taking a photo, two or more cameras of the terminal can be turned on to focus at the same time to complete the image shooting task.

Before shooting, the preset direction of the terminal can be determined according to the specific positions of the first shooting unit and the second shooting unit. When the terminal receives the shooting instruction, it starts to control the first shooting unit to execute along the preset direction. A focus operation is to acquire a first focus parameter value, where the first focus parameter value is a plurality of first focus parameter values acquired during the focus process.

S102. Control the second photographing unit to perform a focusing operation in a direction opposite to the preset direction, and acquire a second focusing parameter value.

In a specific implementation, when the terminal receives the shooting instruction, while controlling the first shooting unit to perform a focusing operation along a preset direction, the terminal also controls the second shooting unit to perform a focusing operation along a direction opposite to the preset direction. operation, that is, the first photographing unit and the second photographing unit perform relative movement, perform a focusing operation, and obtain a second focusing parameter value, and the second focusing parameter value is a plurality of second focusing parameter values obtained during the focusing process.

S103. Determine a focus point of the terminal according to the first focus parameter value and the second focus parameter value.

In a specific implementation, after receiving the shooting instruction, the first shooting unit and the second shooting unit of the terminal perform a focusing operation at the same time, and acquire the first focusing parameter value and the second focusing parameter value in real time during the focusing process , and judge whether the focusing is completed according to the change trend of the focusing parameter value, or continue focusing by adjusting the focusing operation until the focusing point of the terminal is determined.

S104, using the focusing point of the terminal to complete the shooting action.

In a specific implementation, after the focus point of the terminal is determined, the focus point of the terminal is used to perform a shooting action, and the captured clear image can be stored on the electronic screen display of the terminal or in other ways.

By adopting the embodiment of the present invention, the first photographing unit and the second photographing unit of the terminal can perform focusing operations at the same time, so as to realize rapid focusing during the photographing process.

Please refer to FIG. 2 , which is a schematic flowchart of another image capturing method provided by an embodiment of the present invention. The method includes the following steps:

S201. When a shooting instruction is received, control the first camera unit to perform a focusing operation along a preset direction, and acquire at least two Focus parameter value.

In a specific implementation, this embodiment can be applied to a device with a shooting function having two or more cameras, and the device with a shooting function may include a camera with two or more cameras, a mobile phone, a tablet computer, a notebook Computers, etc. The subject can be a portrait, or it can be a landscape, an object, etc. The terminal includes at least a first photographing unit and a second photographing unit, wherein the first photographing unit corresponds to a first group of cameras, and the first group of cameras may be one or more cameras fixed within the first area. The camera; the second shooting unit corresponds to the second group of cameras as the physical device, and the second group of cameras may be one or more cameras fixed within the range of the second area. The first area in the terminal can be bounded by the midpoint of the distance between the center of the lens and the center of the imaging plane, the first area and the second area are the positions on both sides of the center point, such as the area close to the lens is the first area , the area far away from the lens is the second area, or the area far away from the lens is the first area, and the area close to the lens is the second area. After locking the subject in the lens when taking a photo, two or more cameras of the terminal can be turned on to focus at the same time to complete the image shooting task.

Before shooting, the preset direction of the terminal can be determined according to the specific positions of the first shooting unit and the second shooting unit, wherein the preset direction can be the horizontal direction from the shooting object to the terminal, then the preset The opposite direction of the direction is the horizontal direction from the terminal to the subject, or the preset direction is the horizontal direction from the terminal to the subject, then the opposite direction of the preset direction is from the The horizontal orientation of the object to the terminal. During the process from the start of the focus operation to the end of the focus operation, the terminal obtains at least two focus parameter values of the first camera unit according to the focus algorithm, and feeds back the distance between the currently focused clear position and the lens.

S202. Control the second camera unit to perform a focusing operation in a direction opposite to the preset direction, and obtain at least two sets of focus parameter values obtained by the second camera unit from the start of the focus operation to the end of the focus operation.

In a specific implementation, the focusing operations of the first shooting unit and the second shooting unit are performed simultaneously, that is, when a shooting instruction is received, the terminal simultaneously controls the first shooting unit and the second shooting unit to perform the focusing operation, but the first The focusing operation directions of the photographing unit and the second photographing unit are opposite to each other. Take a dual-camera mobile device as an example. The two cameras move the lens from the specified position to search for the best focus position. One camera is close to the subject, and its focus motor moves the lens along the subject to the imaging plane or photosensitive element. , the focus motor of the other camera moves in the opposite direction to the focus motor of the previous camera, each camera calculates the focus parameter value according to the focus algorithm, and feeds back the distance between the clear focus position and the lens in real time.

S203. Determine whether focusing is successful according to the variation trend of the first focusing parameter value and the second focusing parameter value.

In a specific implementation, the terminal judges whether the focus is successful according to the change trend of the first focus parameter value and the second focus parameter value, and the change trend of the first focus parameter value and the second focus parameter value Divided into two situations.

The first situation is that when the first photographing unit and the second photographing unit perform focusing operations, if the change trend of the first focus parameter value and the change trend of the second focus parameter value are both increasing trends, it is judged that Whether the distance from the first shooting unit to the shooting object is equal to the distance from the second shooting unit to the shooting object, that is, the focusing parameter value and the distance between the focusing plane and the lens are monitored in real time during the focusing process, and the mobile device with dual cameras For example, if the value of the first focusing parameter and the value of the second focusing parameter are increasing at the same time, the imaging on the photosensitive plane will become clearer and clearer. When the distances are equal, it can be directly determined that the current focus has been successfully focused.

The second situation is that when the first shooting unit and the second shooting unit perform focusing operations, if the change trend of any one of the first focus parameter value and the second focus parameter value is a decreasing trend, the The focusing operation of the shooting unit whose changing trend is a decreasing trend is reversely adjusted, and a small-step return search action is performed. The photographing unit whose change trend is non-decreasing among the photographing unit and the second photographing unit performs a focusing action with reference to the photographing unit that has completed focusing, and determines that the focusing is successful. That is, during the focusing process, the focus parameter value and the distance between the focus plane and the lens are monitored in real time. Taking a mobile device with dual cameras as an example, the first camera is regarded as the first shooting unit, and the second camera is regarded as the second shooting unit. When the focus parameter value of the first camera shows a decreasing trend, it is necessary to reversely adjust the focus operation of the first camera, and search in small steps on the return trip to find a point with clear focus. The focus point of the first camera is clear, if you directly move to this position, it is judged that the current focus is successful.

S204. If the focus is successful, determine a focus point for the terminal.

In the specific implementation, when the first focusing unit and the second focusing unit find the position of the focus point, it means that the terminal has successfully focused, and only when the focus is successful during the image shooting process can a clearer image be captured. Therefore, if the terminal When it is detected that the focus is successful, the focus point is determined for the terminal, so that the terminal can take a clearer image.

S205, using the focus point of the terminal to complete the shooting action.

In a specific implementation, the terminal has determined the focus point, and when the terminal is in a state where the focus has been successfully focused, the terminal can acquire the image of the object to be photographed, and display it on the display screen or store it in the storage unit of the terminal.

By adopting the embodiment of the present invention, the focusing operation can be completed jointly by the first shooting unit and the second shooting unit of the terminal, and whether the focusing is successful can be judged according to the obtained variation trend of the focusing parameter value, thereby shortening the focusing time and realizing Fast focusing during shooting.

Please refer to FIG. 3 , which is a schematic structural diagram of an image capturing device provided by an embodiment of the present invention. The device includes the following units:

The first acquiring unit 11 is configured to control the first photographing unit to perform a focusing operation along a preset direction and acquire a first focusing parameter value when a photographing instruction is received.

In a specific implementation, this embodiment can be applied to a device with a shooting function having two or more cameras, and the device with a shooting function may include a camera with two or more cameras, a mobile phone, a tablet computer, a notebook Computers, etc. The subject can be a portrait, or it can be a landscape, an object, etc. The terminal includes at least a first photographing unit and a second photographing unit, wherein the first photographing unit corresponds to a first group of cameras, and the first group of cameras may be one or more cameras fixed within the first area. The camera; the second shooting unit corresponds to the second group of cameras as the physical device, and the second group of cameras may be one or more cameras fixed within the range of the second area. The first area in the terminal can be bounded by the midpoint of the distance between the center of the lens and the center of the imaging plane, the first area and the second area are the positions on both sides of the center point, such as the area close to the lens is the first area , the area far away from the lens is the second area, or the area far away from the lens is the first area, and the area close to the lens is the second area. After locking the subject in the lens when taking a photo, two or more cameras of the terminal can be turned on to focus at the same time to complete the image shooting task.

Before shooting, the preset direction of the terminal can be determined according to the specific positions of the first shooting unit and the second shooting unit. When the terminal receives the shooting instruction, it starts to control the first shooting unit to execute along the preset direction. A focus operation is to acquire a first focus parameter value, where the first focus parameter value is a plurality of first focus parameter values acquired during the focus process.

The second acquiring unit 12 is configured to control the second photographing unit to perform a focusing operation in a direction opposite to the preset direction, and acquire a second focusing parameter value.

In a specific implementation, when the terminal receives the shooting instruction, while controlling the first shooting unit to perform a focusing operation along a preset direction, the terminal also controls the second shooting unit to perform a focusing operation along a direction opposite to the preset direction. operation, that is, the first photographing unit and the second photographing unit perform relative movement, perform a focusing operation, and obtain a second focusing parameter value, and the second focusing parameter value is a plurality of second focusing parameter values obtained during the focusing process.

The determination unit 13 is configured to determine the focus point of the terminal according to the first focus parameter value and the second focus parameter value.

In a specific implementation, after receiving the shooting instruction, the first shooting unit and the second shooting unit of the terminal perform a focusing operation at the same time, and acquire the first focusing parameter value and the second focusing parameter value in real time during the focusing process , and judge whether the focusing is completed according to the change trend of the focusing parameter value, or continue focusing by adjusting the focusing operation until the focusing point of the terminal is determined.

The execution unit 14 is configured to use the focusing point of the terminal to complete the shooting action.

In a specific implementation, after the focus point of the terminal is determined, the focus point of the terminal is used to perform a shooting action, and the captured clear image can be stored on the electronic screen display of the terminal or in other ways.

By adopting the embodiment of the present invention, the first photographing unit and the second photographing unit of the terminal can perform focusing operations at the same time, so as to realize rapid focusing during the photographing process.

Please refer to FIG. 4, which is a schematic structural diagram of another image capturing device provided by an embodiment of the present invention. The device includes the following units:

The first acquisition unit 21, when receiving a shooting instruction, controls the first shooting unit to perform a focusing operation along a preset direction, and obtains the information acquired by the first imaging unit from the start of the focusing operation to the end of the focusing operation. At least two focusing parameter values for .

In a specific implementation, this embodiment can be applied to a device with a shooting function having two or more cameras, and the device with a shooting function may include a camera with two or more cameras, a mobile phone, a tablet computer, a notebook Computers, etc. The subject can be a portrait, or it can be a landscape, an object, etc. The terminal includes at least a first photographing unit and a second photographing unit, wherein the first photographing unit corresponds to a first group of cameras, and the first group of cameras may be one or more cameras fixed within the first area. The camera; the second shooting unit corresponds to the second group of cameras as the physical device, and the second group of cameras may be one or more cameras fixed within the range of the second area. The first area in the terminal can be bounded by the midpoint of the distance between the center of the lens and the center of the imaging plane, the first area and the second area are the positions on both sides of the center point, such as the area close to the lens is the first area , the area far away from the lens is the second area, or the area far away from the lens is the first area, and the area close to the lens is the second area. After locking the subject in the lens when taking a photo, two or more cameras of the terminal can be turned on to focus at the same time to complete the image shooting task.

Before shooting, the preset direction of the terminal can be determined according to the specific positions of the first shooting unit and the second shooting unit, wherein the preset direction can be the horizontal direction from the shooting object to the terminal, then the preset The opposite direction of the direction is the horizontal direction from the terminal to the subject, or the preset direction is the horizontal direction from the terminal to the subject, then the opposite direction of the preset direction is from the The horizontal orientation of the object to the terminal. During the process from the start of the focus operation to the end of the focus operation, the terminal obtains at least two focus parameter values of the first camera unit according to the focus algorithm, and feeds back the distance between the currently focused clear position and the lens.

The second acquiring unit 22 is configured to control the second photographing unit to perform a focusing operation in the opposite direction to the preset direction, and acquire at least two groups of images acquired by the second photographing unit from the start of the focusing operation to the end of the focusing operation. Focus parameter value.

In a specific implementation, the focusing operations of the first shooting unit and the second shooting unit are performed simultaneously, that is, when a shooting instruction is received, the terminal simultaneously controls the first shooting unit and the second shooting unit to perform the focusing operation, but the first The focusing operation directions of the photographing unit and the second photographing unit are opposite to each other. Take a dual-camera mobile device as an example. The two cameras move the lens from the specified position to search for the best focus position. One camera is close to the subject, and its focus motor moves the lens along the subject to the imaging plane or photosensitive element. , the focus motor of the other camera moves in the opposite direction to the focus motor of the previous camera, each camera calculates the focus parameter value according to the focus algorithm, and feeds back the distance between the clear focus position and the lens in real time.

The judging unit 23 judges whether the focusing is successful according to the variation trend of the first focusing parameter value and the second focusing parameter value.

In a specific implementation, the terminal judges whether the focus is successful according to the change trend of the first focus parameter value and the second focus parameter value, and the change trend of the first focus parameter value and the second focus parameter value Divided into two situations.

The first situation is that when the first photographing unit and the second photographing unit perform focusing operations, if the change trend of the first focus parameter value and the change trend of the second focus parameter value are both increasing trends, it is judged that Whether the distance from the first shooting unit to the shooting object is equal to the distance from the second shooting unit to the shooting object, that is, the focusing parameter value and the distance between the focusing plane and the lens are monitored in real time during the focusing process, and the mobile device with dual cameras For example, if the value of the first focusing parameter and the value of the second focusing parameter are increasing at the same time, the imaging on the photosensitive plane will become clearer and clearer. When the distances are equal, it can be directly determined that the current focus has been successfully focused.

The second situation is that when the first shooting unit and the second shooting unit perform focusing operations, if the change trend of any one of the first focus parameter value and the second focus parameter value is a decreasing trend, the The focusing operation of the shooting unit whose changing trend is a decreasing trend is reversely adjusted, and a small-step return search action is performed. The photographing unit whose change trend is non-decreasing among the photographing unit and the second photographing unit performs a focusing action with reference to the photographing unit that has completed focusing, and determines that the focusing is successful. That is, during the focusing process, the focus parameter value and the distance between the focus plane and the lens are monitored in real time. Taking a mobile device with dual cameras as an example, the first camera is regarded as the first shooting unit, and the second camera is regarded as the second shooting unit. When the focus parameter value of the first camera shows a decreasing trend, it is necessary to reversely adjust the focus operation of the first camera, and search in small steps on the return trip to find a point with clear focus. The focus point of the first camera is clear, if you directly move to this position, it is judged that the current focus is successful.

The focus determination unit 24 determines a focus point for the terminal if the focus is successful.

In the specific implementation, when the first focusing unit and the second focusing unit find the position of the focus point, it means that the terminal has successfully focused, and only when the focus is successful during the image shooting process can a clearer image be captured. Therefore, if the terminal When it is detected that the focus is successful, the focus point is determined for the terminal, so that the terminal can take a clearer image.

The execution unit 25 uses the focusing point of the terminal to complete the shooting action.

In a specific implementation, the terminal has determined the focus point, and when the terminal is in a state where the focus has been successfully focused, the terminal can acquire the image of the object to be photographed, and display it on the display screen or store it in the storage unit of the terminal.

By adopting the embodiment of the present invention, the focusing operation can be completed jointly by the first shooting unit and the second shooting unit of the terminal, and whether the focusing is successful can be judged according to the obtained variation trend of the focusing parameter value, thereby shortening the focusing time and realizing Fast focusing during shooting.

The modules or sub-modules in all the embodiments of the present invention can be implemented by a general-purpose integrated circuit, such as a CPU (Central Processing Unit, central processing unit), or an ASIC (Application Specific Integrated Circuit, application-specific integrated circuit).

The steps in the methods of the embodiments of the present invention can be adjusted, combined and deleted according to actual needs.

The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (8)

1. A method for photographing an image, applied in a terminal, the terminal at least including a first photographing unit and a second photographing unit, the method comprising: When receiving a shooting instruction, control the first shooting unit to perform a focusing operation along a preset direction, and acquire a first focusing parameter value; controlling the second shooting unit to perform a focusing operation in a direction opposite to the preset direction, and acquiring a second focusing parameter value; When the first shooting unit and the second shooting are performing focusing operations, if the change trend of the first focus parameter value and the change trend of the second focus parameter value are both increasing trends, determine that the first shooting unit Whether the distance to the shooting object is equal to the distance from the second shooting unit to the shooting object; if they are equal, determine that the focus is successful, and determine the focus point for the terminal; The shooting action is completed by using the focusing point of the terminal. 2. The method according to claim 1, wherein the preset direction is: a horizontal direction from the subject to the terminal; The opposite direction of the preset direction is: a horizontal direction from the terminal to the object to be photographed. 3. The method according to claim 2, wherein the first focus parameter value comprises: at least two focus parameters obtained by the first photographing unit from the start of the focus operation to the end of the focus operation value; The second focus parameter value includes: at least two focus parameter values obtained by the second photographing unit from the start of the focus operation to the end of the focus operation. 4. The method of claim 1, further comprising: When the first shooting unit and the second shooting are performing focusing operations, if the change trend of any one of the first focus parameter value and the second focus parameter value is a decreasing trend, set the change trend as a decreasing trend. The focus operation of the shooting unit of the trend is adjusted in reverse, and the return search action is performed in small steps; After the shooting unit whose change trend is decreasing trend completes focusing through the small step search action on the return journey, the shooting unit whose changing trend is non-decreasing trend in the first shooting unit and the second shooting unit refers to the shooting unit that has completed focusing. Focus action, and confirm that the focus is successful. 5. An image capturing device, applied to a terminal, the terminal at least comprising a first capturing unit and a second capturing unit, the device comprising: The first acquiring unit is configured to, when receiving the shooting instruction, control the first shooting unit to perform a focusing operation along a preset direction, and acquire a first focusing parameter value; The second acquiring unit is configured to control the second photographing unit to perform a focusing operation in a direction opposite to the preset direction, and acquire a second focusing parameter value; A judging unit, configured to determine whether the first focus parameter value's change trend and the second focus parameter value's change trend are increasing trends when the first camera unit and the second camera perform a focusing operation. Whether the distance from the first shooting unit to the shooting object is equal to the distance from the second shooting unit to the shooting object; if they are equal, it is determined that the focus is successful; a focus determination unit, configured to determine a focus point for the terminal if the focus is successful; The execution unit is configured to use the focusing point of the terminal to complete the shooting action. 6. The device according to claim 5, wherein the preset direction is: a horizontal direction from the subject to the terminal; The opposite direction of the preset direction is: a horizontal direction from the terminal to the shooting object. 7. The device according to claim 6, wherein the first focus parameter value comprises: at least two groups of focus parameters obtained by the first photographing unit from the start of the focus operation to the end of the focus operation value; The second focus parameter value includes: at least two groups of focus parameter values acquired by the second photographing unit from the start of the focus operation to the end of the focus operation. 8. The device according to claim 5, wherein the judging unit is further configured to: When the first shooting unit and the second shooting are performing focusing operations, if the change trend of any one of the first focus parameter value and the second focus parameter value is a decreasing trend, the change trend is a decreasing trend The focus operation of the shooting unit is adjusted in reverse, and the return search action is performed in small steps; After the shooting unit whose change trend is decreasing trend completes focusing through the small step search action on the return journey, the shooting unit whose changing trend is non-decreasing trend in the first shooting unit and the second shooting unit refers to the shooting unit that has completed focusing. Focus action, and confirm that the focus is successful.