JPH09261656A - Video compression encoding device - Google Patents

Abstract

(57) Abstract: In a conventional moving image compression encoding apparatus, when a scene change occurs, the amount of generated code increases because the correlation between frames before and after the scene change is small, and the rate is increased from the next frame. The image quality of the image after the scene change is deteriorated by performing the compression encoding with the generated code amount suppressed by using the quantization table having the large quantization step value so that the buffer does not overflow. The present invention relates to four filters 4, 5, 6, 7 having different frequency characteristics (upper limit of pass band) for removing unnecessary high frequency components from a video signal, and a scene for detecting a scene change. The change detection circuit 3 and, when a scene change is detected, the selection circuit 8 that outputs the video signal of the frame immediately after the scene change that has passed through the filter 7 having the lowest upper limit of the pass band to the orthogonal transformation circuit 10 as it is.
It is comprised including. As a result, the amount of generated code after a scene change is suppressed and the image quality can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture compression coding apparatus for carrying out compression coding of a moving picture using frame correlation of video signals.

[0002]

2. Description of the Related Art Compression coding of a moving image is performed by using frame correlation of a video signal. FIG. 7 shows the configuration of a conventional moving picture compression coding apparatus for compressing and coding a moving picture using the frame correlation of this video signal.

In the figure, the video signal input to the input terminal 101 is input to the filter 102. Filter 1
In 02, unnecessary high-frequency signal components are removed by compression coding of a moving image, and the output thereof is input to the subtraction circuit 103.
In the subtraction circuit 103, the subtraction processing of the video signal from the filter 102 and the video signal of one frame before from the frame memory 111 is performed, and the difference data is processed by the orthogonal transformation circuit 1.
04 is input. The orthogonal transformation circuit 104 is the subtraction circuit 1
From the difference data which is the output of 03.
Pixels are taken in as a unit block (N and Μ are positive numbers), and a coefficient obtained by converting the pixel array from a time axis region to a different region is output to the quantization circuit 105.

The quantization circuit 105 quantizes each coefficient.
At that time, the quantization circuit 105 quantizes each coefficient based on a quantization table selected from several types of quantization tables having different quantization step values. The quantizing circuit 105 is provided with a quantizing table so that the amount of generated code and the amount of transmitted code are within a certain range.

The quantized data output from the quantization circuit 105 is extracted for each unit block and input to the variable length coding circuit 106. Here, the variable length coding is performed using an efficient coding method such as Huffman coding. The variable-length coded data is input to the rate buffer circuit 107, read from the rate buffer circuit 107 at a prescribed speed, and output to the transmission path. The rate buffer circuit 107 serves as a buffer that absorbs the difference between the generated code amount and the transmitted code amount because the output of the variable length encoding circuit 106 has a variable rate and is different from the rate of the transmission path.

The output of the quantization circuit 105 is input to the inverse quantization circuit 108 and inversely quantized. The output of the inverse quantization circuit 108 is input to the inverse orthogonal transformation circuit 109, where it is returned to the original signal. This signal is the adder 1
The video signal is returned to the video signal substantially equal to the video signal from the filter 102 through 10 and is input to the frame memory 111. The frame memory 111 stores this video signal and supplies it to the subtraction circuit 103 to perform a difference calculation with the video signal of the next frame.

In this way, since the moving image is compression-encoded by taking the difference between the frames, the frame difference signal output from the subtraction circuit 103 becomes almost zero in the case of a series of moving images having a large correlation between the frames. Become. By compressing and coding this frame difference signal, moving image information can be transmitted with a small code amount.

[0008]

However, when a scene change such as switching of a large scene occurs in a video, the generated code amount increases because the correlation between frames before and after the scene change is small. For this reason, the amount of code in the rate buffer temporarily increases, and compression coding is performed with a small amount of code generated using a quantization table with a large quantization step value so that the rate buffer does not overflow from the next frame. . Therefore, the image quality deteriorates from the image after the scene change (the second frame after the scene change).

The present invention is intended to solve such a problem, and it is possible to suppress an increase in the amount of code generated when a scene change occurs and to improve the image quality of the image after the scene change. An object is to provide a compression encoding device.

[0010]

In order to achieve the above object, a moving picture compression coding apparatus according to the present invention, as described in claim 1, removes a high frequency component of an input video signal. The difference between the first filter and the second filter that removes the high frequency component of the input video signal and whose upper limit of the pass band is lower than that of the first filter, and the frame of the video signal that has passed the first filter are calculated. Subtracting means, orthogonal transforming means for orthogonally transforming the difference signal obtained by the subtracting means, quantizing means for quantizing the output signal of the orthogonal transforming means, and scene change detecting means for detecting a scene change from the input video signal. ,
When a scene change is detected by the scene change detecting means, a second filter is selected, and a selecting means for directly introducing the video signal of the frame immediately after the scene change that has passed through the second filter into the orthogonal transforming means. It is equipped with.

In the present invention, the high frequency component is removed from the video signal of the frame immediately after the scene change by using the second filter having a low upper limit of the pass band, and the information amount of the video signal itself is reduced. By directly introducing the video signal having a small amount of information to the orthogonal transform means, performing orthogonal transform, and then quantizing, the amount of code can be suppressed to a lower value than that when the frame difference is taken, and the generated code amount can be suppressed. . Therefore, in the compression encoding of the next frame, the probability that the generated code amount must be reduced by using the quantization table having a large quantization step value is significantly reduced, and the deterioration of the image quality of the image due to it can be suppressed. Note that the image quality of the first frame immediately after a scene change is reduced by reducing the amount of information, but due to human visual characteristics, the image immediately after a scene change is hard to see, so the image of the first frame immediately after a scene change is Degradation of image quality is not a problem.

Further, the moving picture compression coding apparatus of the present invention is
As described in claim 2, a plurality of filters for removing high frequency components of the input video signal and having different upper limit values of pass bands, and subtraction means for taking a difference between frames of the video signal passed through the filter. An orthogonal transforming means for orthogonally transforming the difference signal obtained by the subtracting means, a quantizing means for quantizing the output signal of the orthogonal transforming means, a scene change detecting means for detecting a scene change from the input video signal,
When a scene change is detected by the scene change detecting means, the filter having the lowest upper limit of the pass band is selected from the filters, and the video signal of the frame immediately after the scene change that has passed through the selected filter is orthogonally transformed. Introduced directly into the means, for the subsequent frames,
a selection means for introducing a video signal that has passed through this filter into the subtraction means while switching to a filter having the next lower upper limit of the pass band for every n (n is an integer of 1 or more) frames. Is.

That is, according to the present invention, the information amount of the video signal is minimized in the first frame immediately after the scene change, but the information amount of the video signal is gradually increased every time the frame is switched in the subsequent frames. That is. By doing so, it is possible to reduce the difference between the first frame immediately after a scene change with a small amount of information and the next and subsequent frames, suppress the generated code amount, and change the image quality rapidly. It is possible to prevent the image from being unnatural due to.

Further, in the moving image compression encoding apparatus of the present invention, as described in claim 3, the first filter for removing the high frequency component of the input video signal, and the high frequency component of the input video signal. Subtracting the difference between a plurality of second filters each having a lower upper limit value of the pass band and different upper limit values of the pass band from each other and a frame of the video signal passed through the first filter. Means, orthogonal transformation means for orthogonally transforming the difference signal obtained by the subtraction means, quantization means for quantizing the output signal of the orthogonal transformation means, and quantized data obtained by the quantization means for a variable length code. Variable length coding means for converting the code, buffer means for holding the code obtained by the variable length coding means, code reading means for reading the code held in the buffer means at a predetermined rate, and scene check from the input video signal. A scene change detecting means for detecting a scene change, a code quantity detecting means for detecting the code quantity held in the buffer means, and a scene change detecting means for detecting a scene change, the code quantity detected by the code quantity detecting means. A selection means for selecting an optimum one from a plurality of second filters based on the above, and for directly introducing the video signal of the frame immediately after the scene change that has passed through the selected second filter to the orthogonal transformation means. It will be.

With this configuration, it is possible to minimize deterioration of the image of the first frame immediately after the scene change by reducing the information amount of the video signal itself.

Further, in the moving picture compression encoding apparatus of the present invention, as described in claim 4, the first filter for removing the high frequency component of the input video signal, and the high frequency component of the input video signal. Subtracting the difference between a plurality of second filters each having a lower upper limit value of the pass band and different upper limit values of the pass band from each other and a frame of the video signal passed through the first filter. Means, orthogonal transformation means for orthogonally transforming the difference signal obtained by the subtraction means, quantization means for quantizing the output signal of the orthogonal transformation means, and scene change detection means for detecting a scene change from the input video signal. , The scene change interval measuring means for measuring the scene change interval and the scene change interval measuring means when the scene change is detected by the scene change detecting means. The optimum one is selected from the plurality of second filters based on the interval between the selected scene change and the next scene change, and the video signal of the frame immediately after the scene change that has passed through the selected second filter is selected. It comprises a selecting means to be directly introduced into the orthogonal transforming means.

With this configuration, it is possible to minimize the deterioration of the image of the first frame immediately after the scene change by reducing the information amount of the video signal itself.

Further, the moving picture compression coding apparatus of the present invention is selected by the selecting means in the moving picture compression coding apparatus according to any one of claims 1 to 4, as described in claim 5. It is characterized in that the quantization parameter of the quantization means is variably set according to the filter.

According to the present invention, it is possible to further reduce the generated code amount of the frame immediately after the scene change.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of a moving picture compression coding apparatus according to the present invention.

The video signal input from the input terminal 1 is input to the scene change detection circuit 3 and the delay circuit 2. The scene change detection circuit 3 detects a scene change from the video signal and inputs the result to the selection circuit 8. As a concrete method of detecting this scene change, a method of obtaining a difference between the frames and assuming that a scene change has occurred when the difference value is equal to or more than a preset threshold value, an original video signal There is a method in which an identification signal indicating that a scene change position is between the frames is inserted between frames before and after the scene change, and the scene change is detected by detecting the identification signal.

The plurality of video signals delayed by the delay circuit 2 are four filters 4, 5, 6, in this embodiment.
7 is input. The filters 4, 5, 6, and 7 have different frequency characteristics, and supply the selection circuit 8 with the unnecessary high-frequency components removed from the video signal in accordance with the unique frequency characteristics. The reason why the delay circuit 2 gives a predetermined delay to the video signal is that the output of the scene change detection circuit 3 and the outputs of the filters 4, 5, 6, 7 are input to the selection circuit 8 in synchronization. is there.

FIG. 2 shows the frequency characteristics of each filter. Each filter is a low-pass filter (LPF) having an upper limit of the pass band, and the upper limit value of the pass band is low in the order of 4, 5, 6, and 7. Therefore, the amount of information of the video signal that has passed through the filters 4, 5, 6, and 7 decreases in the order of the filter 4, the filter 5, the filter 6, and the filter 7.

Before the scene change occurs, that is, when the scene change detection circuit 3 does not detect the scene change, the selection circuit 8 selects the output of the filter 4 having the highest upper limit of the pass band. That is, the video signal with the largest amount of information is selected as the video signal after passing through the filter, and the subtraction circuit 9
Is input to The subsequent operation is the same as the conventional one.

That is, the subtraction circuit 9 performs a subtraction process on the video signal from the filter 4 and the video signal from the frame memory 17 one frame before, and the difference data is input to the orthogonal transformation circuit 10. The orthogonal transformation circuit 10 takes in horizontal Ν pixels and vertical M pixels as a unit block (N and Μ are positive numbers) from the difference data, and transforms the pixel array from a time axis domain to a different domain, and a quantization circuit 11
Output to The quantization circuit 11 quantizes each coefficient using a quantization table selected from several types of quantization tables having different quantization step values. The quantized data output from the quantization circuit 11 is extracted for each unit block, input to the variable length coding circuit 12, and variable length coding is performed. The variable-length coded data is input to the rate buffer 13, then read at a prescribed speed, and output to the transmission path. The output of the quantization circuit 11 is input to the inverse quantization circuit 14 and inversely quantized. The output of the inverse quantization circuit 14 is input to the inverse orthogonal transform circuit 15, where it is returned to the original signal. This signal is the adder 1
The video signal is returned to a video signal substantially equal to the video signal from the filter 4 through 6 and is input to the frame memory 17. The frame memory 17 stores this video signal and supplies it to the subtraction circuit 9 for performing a difference calculation with the video signal of the next frame.

When the scene change detection circuit 3 detects a scene change, the scene change detection circuit 3 outputs a scene change detection signal to the selection circuit 8.
When the selection circuit 8 receives the scene change detection signal, it selects the output of the filter 7 having the lowest upper limit of the pass band.
Since the output of each filter and the output of the scene change detection circuit 3 are synchronized by the delay circuit 2, the output video signal of the filter selected when the selection circuit 8 inputs the scene change detection signal is the video signal immediately after the scene change. It is a frame. As a result, the video signal having the smallest amount of information is selected by the selection circuit 8 and input to the subtraction circuit 9.

When the scene change detection circuit 3 detects a scene change, the switch 18 between the frame memory 17 and the subtraction circuit 9 is opened. As a result, the video signal having a small amount of information that has passed through the filter 7 is directly supplied to the orthogonal transformation circuit 10, and the coefficient obtained by the orthogonal transformation is quantized by the quantization circuit 11.
Therefore, the amount of generated code for the frame immediately after the scene change is smaller than that when the frame difference is taken because the amount of information of the video signal itself is small, and the generated code amount can be suppressed. Therefore, in the compression encoding of the next frame, the probability that the generated code amount must be reduced by using the quantization table having a large quantization step value is reduced, and the deterioration of the image quality of the image can be suppressed.

Although the image quality of the image of the first frame immediately after the scene change is deteriorated by reducing the information amount of the video signal itself, the image immediately after the scene change is hard to see because of human visual characteristics, and therefore, the image immediately after the scene change is made. The deterioration of the image quality of the image of the first frame of is not a problem. On the other hand, in the case of the conventional method, the image quality deteriorates from the next frame at the beginning, so that the deterioration of the image quality is easily caught by human eyes. Therefore, according to this embodiment, the image quality of the image after the scene change is apparently and reliably improved.

Further, the selection circuit 8 uses the timer 30 to measure the elapsed time from the input of the scene change detection signal, and the filters to be selected are the filters 6 and 5 each time one frame has elapsed. , And filter 4 in that order. That is, the amount of information in the video signal is minimized in the first frame immediately after the scene change, but in the subsequent frames, the amount of information in the video signal is gradually increased each time the frame is switched.

By doing so, it is possible to reduce the difference between the first frame immediately after a scene change and the subsequent frames having a small amount of information, and to suppress the generated code amount. Moreover, it is possible to prevent the image from being unnatural due to a rapid change in image quality. Next, a second embodiment will be described.

FIG. 3 is a block diagram showing the configuration of the moving picture compression coding apparatus according to the second embodiment.

This moving picture compression coding apparatus has a code quantity detection circuit 19 for detecting the code quantity (or code occupancy rate) in the rate buffer 13 in the structure of the apparatus according to the first embodiment shown in FIG. Is added. The code amount detected by the code amount detection circuit 19 is referred to when the selection circuit 8 inputs the scene change detection signal from the scene change detection circuit 3. The selection circuit 8 determines, based on the current code amount in the referred rate buffer 13, which filter output is selected from the three filters 5, 6 and 7 whose upper limit of the pass band is suppressed.

The selection circuit 8 makes the current code amount in the rate buffer 13 "large" or "small" according to a predetermined evaluation standard.
When the code amount is evaluated as "small", the output of the filter 5 having the largest amount of information is selected from the three filters 5, 6 and 7 to select the code amount. Is evaluated to be “large”, the output of the filter 7 having the smallest amount of information is selected, and when the code amount is evaluated to be “intermediate”, the output of the filter 6 is selected.

The subsequent operation is the same as that of the first embodiment. The video signal selected by the selection circuit 8 is directly supplied to the orthogonal transformation circuit 10 through the subtraction circuit 9, and the coefficient obtained by the orthogonal transformation circuit 10 is Quantization is performed by the quantization circuit 11.

By doing so, it is possible to minimize the deterioration of the image of the first frame immediately after the scene change by reducing the information amount of the video signal itself. Next, a third embodiment will be described.

FIG. 4 is a block diagram showing the configuration of the moving picture compression coding apparatus according to the third embodiment.

This moving image compression encoding apparatus has the structure (the number of frames) of the scene change from the scene change detection timing by the scene change detection circuit 3 in the structure of the apparatus according to the first embodiment shown in FIG. A scene change interval measuring circuit 20 for measuring is added. When the scene change detection circuit 3 detects a scene change, it inputs a detection signal for the previous scene change to the selection circuit 8 at the detection timing of the next scene change. When the scene change detection circuit 3 inputs the scene change detection signal to the selection circuit 8, the scene change interval measurement circuit 20 inputs the number of frames until the next scene change to the selection circuit 8. Therefore, it is a necessary condition that the scene change detection circuit 3 has sufficient memory to hold the video signal from one scene change to the next scene change. Further, the scene change detection circuit 3 and the scene change interval measuring circuit 20 input the scene change detection signal and the number of frames to the selection circuit 8 and the input of the video signal from each filter 4, 5, 6, 7 to the selection circuit 8. In order to synchronize with, the delay circuit 2 is also required to be provided with a sufficient memory for holding the video signal from one scene change to the next scene change.

The selection circuit 8 is the scene change detection circuit 3
When a scene change detection signal is input from the three filters 5, 6, 7 whose upper limit of the pass band is suppressed based on the number of frames indicating the interval from the scene change interval measuring circuit 20 to the next scene change. Decide which filter output to select.

The selection circuit 8 evaluates the scene change interval into three levels of "long", "short" and "intermediate" according to a predetermined evaluation standard, and when the scene change interval is evaluated as "long", the above three filters 5 are used. , 6 and 7 the output of the filter 5 with the largest amount of information is selected, and if the scene change interval is evaluated as "short", the output of the filter 7 with the smallest amount of information is selected and the scene change interval is When it is evaluated as "the middle", the output of the filter 6 is selected.
That is, the fact that the interval to the next scene change is short indicates that the code amount of the rate buffer 13 tends to increase, and in this case, the output of the filter 7 having the smallest amount of information is selected so that the rate is increased. The code amount in the buffer 13 can be suppressed.

By doing so, it is possible to minimize the deterioration of the image of the first frame immediately after the scene change by reducing the information amount of the video signal itself. Next, a fourth embodiment will be described.

FIG. 5 is a block diagram showing the structure of the moving picture compression coding apparatus according to the fourth embodiment.

This moving image compression encoding apparatus has the same structure as the apparatus of the first embodiment shown in FIG. 1 and is used in the quantization circuit 11 based on the information of the filter selected by the selection circuit 8. It is configured to select a table. The quantization circuit 11 has several kinds of quantization tables with different quantization step values, and the generated code amount can be reduced by using a table with a large quantization step value. In this moving image compression coding apparatus, filters 5, 6, 7 having a low upper limit of pass band in the selection circuit 8 are used.
When is selected, the generated code amount is further reduced by selecting a quantization table having a larger quantization step value than the quantization table normally used. As described above, the frame whose image quality is deteriorated by the method of the present invention is only the first frame immediately after the scene change, and the first frame immediately after this scene change is apparently no problem even if it deteriorates to some extent in human visual characteristics. is there.

The four embodiments have been described above.
These can be appropriately combined and configured.
FIG. 6 shows the configuration of a moving picture compression coding apparatus in which the above four embodiments are combined. In this example, the selection circuit 8 outputs the scene change detection signal from the scene change detection circuit 3,
Based on the code amount of the rate buffer 13 from the code amount detection circuit 19 and the scene change interval from the scene change interval measurement circuit 20, an optimum filter is selected and at the same time, a quantization table used in the quantization circuit 11 is selected. It is composed.

[0045]

As described above, according to the moving picture compression coding apparatus of each claim of the present invention, since the generated code amount of the first frame immediately after the scene change can be suppressed, the compression coding of the subsequent frames is performed. In this case, the low image quality quantization in which the generated code amount is suppressed is not performed, and the image quality after the scene change can be improved.

According to the moving picture compression coding apparatus of the second aspect of the present invention, the information amount of the video signal is minimized in the first frame immediately after the scene change, but the subsequent frames are switched every time the frame is switched. By gradually increasing the information amount of the video signal, it is possible to reduce the difference between the first frame immediately after the scene change and the subsequent frames with a small information amount, and suppress the generated code amount. In addition, it is possible to prevent the image from being unnatural due to a sharp change in image quality. further,
According to the moving picture compression coding apparatus of claims 3 to 4, the deterioration of the image of the first frame immediately after the scene change due to the reduction of the information amount of the video signal itself can be suppressed to the minimum. It will be possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a moving picture compression encoding apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing frequency characteristics of each filter in the moving picture compression encoding apparatus of FIG.

FIG. 3 is a block diagram showing a configuration of a moving picture compression encoding apparatus according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a moving picture compression encoding apparatus according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a moving picture compression encoding apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a moving picture compression encoding apparatus according to a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a conventional moving image compression encoding device.

[Explanation of symbols]

 1 ... Input terminal 2 ... Delay circuit 3 ... Scene change detection circuit 4, 5, 6, 7 ... Filter 8 ... Selection circuit 9 ... Subtraction circuit 10 ... Orthogonal transformation circuit 11 ... Quantization circuit 12 ... Variable length coding circuit 13 ... Rate buffer 14 ... Inverse quantization circuit 15 ... Inverse orthogonal transformation circuit 16 ... Adder 17 ... Frame memory 18 ... Switch 19 Code amount detection circuit 20 Scene change interval measurement circuit 30 Timer

Claims (5)

[Claims] 1. A first filter for removing a high frequency component of an input video signal, and a second filter for removing a high frequency component of the input video signal, the upper limit of a pass band of which is lower than that of the first filter. A filter, a subtracting unit that takes a difference between frames of the video signal that has passed through the first filter, an orthogonal transforming unit that orthogonally transforms the difference signal obtained by the subtracting unit, and an output signal of the orthogonal transforming unit is a quantum signal. Quantizing means for converting the input video signal, scene change detecting means for detecting a scene change from the input video signal, and when the scene change detecting means detects a scene change, the second filter is selected and the second filter is selected. A moving picture compression coding apparatus, comprising: a selecting means for directly introducing the video signal of the frame immediately after the scene change that has passed through the filter to the orthogonal transforming means. Place. 2. A plurality of filters for removing a high frequency component of an input video signal, each having a different upper limit value of a pass band, a subtraction unit for calculating a difference between frames of the video signal passed through the filter, and the subtraction. Orthogonal transforming means for orthogonally transforming the difference signal obtained by the means, quantizing means for quantizing the output signal of the orthogonal transforming means, scene change detecting means for detecting a scene change from the input video signal, and this scene change When a scene change is detected by the detection means, the filter having the lowest upper limit of the pass band is selected from the filters, and the video signal of the frame immediately after the scene change which has passed through the selected filter is converted into the orthogonal transformation means. For the next and subsequent frames, the upper limit of the pass band is the next lower frame for every n (n is an integer of 1 or more) frames. While switching to filter, moving picture compression encoding apparatus characterized by comprising a selection means for introducing a video signal that has passed through the filter to the subtracting means. 3. A first filter for removing a high-frequency component of an input video signal, and an upper limit of a pass band lower than that of the first filter for removing a high-frequency component of the input video signal and passing each other. A plurality of second filters having different band upper limit values, subtraction means for taking a difference between frames of the video signal that has passed through the first filter, and orthogonal transformation means for orthogonally transforming the difference signal obtained by the subtraction means. A quantizing means for quantizing the output signal of the orthogonal transforming means, a variable length coding means for variable length coding the quantized data obtained by the quantizing means, and a variable length coding means Buffer means for holding a code, code reading means for reading the code held in the buffer means at a predetermined rate, scene change detecting means for detecting a scene change from the input video signal, Code amount detecting means for detecting the code amount held by the buffer means, and when the scene change is detected by the scene change detecting means, the plurality of second numbers are detected based on the code amount detected by the code amount detecting means. And a selecting means for directly introducing the video signal of the frame immediately after the scene change, which has passed through the selected second filter, to the orthogonal transforming means. Image compression coding device. 4. A first filter for removing a high frequency component of an input video signal, and an upper limit of a pass band lower than that of the first filter for removing a high frequency component of the input video signal and passing each other. A plurality of second filters having different band upper limit values, subtraction means for taking a difference between frames of the video signal that has passed through the first filter, and orthogonal transformation means for orthogonally transforming the difference signal obtained by the subtraction means. A quantizing means for quantizing the output signal of the orthogonal transforming means; a scene change detecting means for detecting a scene change from the input video signal; a scene change interval measuring means for measuring an interval between the scene changes; When a scene change is detected by the scene change detecting means, the next scene from the scene change measured by the scene change interval measuring means is detected. The optimum one is selected from the plurality of second filters based on the interval up to the frame change, and the video signal of the frame immediately after the scene change that has passed through the selected second filter is directly introduced to the orthogonal transformation means. A moving picture compression coding apparatus comprising: a selection unit. 5. The moving picture compression coding apparatus according to claim 1, wherein the quantization parameter of the quantization means is variably set in correspondence with the filter selected by the selection means. Video compression encoding device.