JPH05336369A - Image reader - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to switch between binary processing and halftone processing of image data read on the way even after starting reading of a document. [Configuration] In the present invention, the timing generator 2
0 periodically outputs a sampling signal to the latch circuit 15 via the OR gate 19. Therefore, when the selection state of the mode selection switch 43 is changed during the reading of the hand scanner unit 4, the latch circuit 15 holds the selection state of the mode selection switch 43 at this point. Therefore, the selector 12 sends the image data input from the A / D conversion circuit 16 to either the binarization circuit 13 or the halftone processing unit 14 according to the mode selection state held in the latch circuit 15. Output. As a result, in this example, even if the original image is being read, the input image data is
It is possible to arbitrarily change whether to perform the binarization process or the halftone process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus which manually moves a hand scanner on a document to read an image of the document and input the image to a main body.

[0002]

2. Description of the Related Art Conventionally, an image reading apparatus of this type is mounted on a facsimile apparatus or the like for storing read image data in an image memory and displaying it on a display screen of an LCD or the like, and then performing processing such as transmission. It has an appearance example as shown in FIG. In FIG. 3, reference numeral 1 denotes a main body of the image reading apparatus, which is provided with a display unit 2 such as an LCD for displaying the read image data and a binary / halftone mode selection switch (hereinafter simply referred to as a mode selection switch) 3. ing. Reference numeral 4 denotes a hand scanner unit.
The image data obtained by manually scanning the document 100 on the original 100 is transferred to the main body 1 side via the code 5. The main body 1 performs various processes on the image data input via the code 5, and then displays it on the display unit 2. Before starting the reading of the document by the hand scanner unit 4, by operating the mode selection switch 3 of the main body 1, the image data transferred from the hand scanner unit 4 to the main body 1 side is binarized, or Whether to perform halftone processing can be switched.

FIG. 4 is a block diagram showing a configuration example of the document reading apparatus shown in FIG. First, the operator switches the mode selection switch 3 to set whether the input image data is binarized or halftone processed when reading a document. After that, the operator pushes the reading start switch 42 of the hand scanner unit 4 to notify the CPU 11 of the main body 1 of the start of reading the original. As a result, the CPU 11 outputs a sample signal to the latch circuit 15, and the circuit 1
5 is operated to cause the latch circuit 15 to hold the mode selection state of the mode selection switch 3. According to the mode selection state held in the latch circuit 15, the selector 12 outputs the input image data to the binarizing circuit 13 when binarizing the input image data, and outputs the halftone when performing the halftone processing. The output is switched to the processing unit 14.

When the reading of the document by the hand scanner unit 4 is started in this state, the image data read by the CCD 41 is input to the A / D conversion circuit 16 on the main body 1 side and digitized. The digitized image data is output by the selector 12 to either the binarization circuit 13 or the halftone processing unit 14. The binarization circuit 13 binarizes the input image data and then outputs it to the display control unit 17 and the image memory unit 18. Display control unit 17
Converts the input image data into a display format and displays it on the display unit 2 in FIG. The image memory unit 18 stores the input image data. When the image data is input to the halftone processing unit 14, the image data is halftone processed here and then sent to the binarization circuit 13. Subsequent processing is the above 2
It is similar to the value conversion process.

Here, using the hand scanner unit 4, FIG.
Manuscript 1 with a mixture of text section a and photo section b as shown in
The case of reading 00 will be described. When such a document is read, the main body 1 must perform binarization processing on the input image data in the portion (a) and halftone processing in the portion (b). However, in the above-mentioned conventional image reading apparatus, once the image reading is started by the hand scanner unit 4, even if the mode selection switch 3 is changed thereafter, the latch circuit 15 does not perform the sampling operation and is initially set. Since the selected mode selection information is supplied to the selector 12, the selector 12 continues to send the image data to the circuit corresponding to the initially set mode. For this reason,
The original 100 as described above had to be read by either one of the binarization processing and the halftone processing. Therefore, when the original is read by the binarization processing, the optimum image processing of the photograph portion B cannot be performed, and when the original is read by the halftone processing, the optimum image processing of the document portion B cannot be performed. .. Therefore, the reading operation of the hand scanner unit 4 is performed at the portions A and B of the original document so that the portion B of the original document shown in FIG. 5 is read by the binarization processing and the portion B is read by the halftone processing. If you stop the operation, switch the image data processing mode, and then start reading again, C
Since the PU 11 processes the portion A as a one-page original document and the portion B as another one-page original document, FIG.
However, there is a drawback that the original document cannot be processed as a one-page original document.

[0006]

As described above, in the conventional image reading apparatus which can select whether the read image data is binarized or halftone processed, once the reading of the original document is started. However, since it is not possible to switch between the binarization processing and the halftone processing in the middle of the process, there is a drawback in that it is not possible to perform optimum image processing on each part of the document containing a photograph or the like in the document. there were.

In view of the above, the present invention eliminates the above-mentioned drawbacks and makes it possible to switch between binarization processing and halftone processing of image data read in the middle of reading the original even after the reading of the original is started. The purpose is to provide a device.

[0008]

SUMMARY OF THE INVENTION According to the present invention, an image reading can be set in accordance with the change-over state of a change-over switch, either of binarization processing or halftone processing of image data read by a scanner. In the apparatus, during the image reading period of the scanner, reading means for periodically reading the switching state of the changeover switch, and image data read by the scanner according to the switching state of the switch read by the reading means. A mode control means is provided for selecting and switching either the direct binarization process or the halftone process and then the binarization process.

[0009]

In the image reading apparatus of the present invention, the reading means periodically reads the switching state of the changeover switch during the image reading period of the scanner. Whether the mode control means directly binarizes the image data read by the scanner according to the switching state of the switch read by the reading means, or performs binarization processing after performing halftone processing. Select either one of them to switch.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the image reading apparatus of the present invention. Reference numeral 1 is a main body for processing image data input from the hand scanner unit 4, 4 is a hand scanner unit for manually scanning a document (not shown) to obtain image data, and 5 is read by the hand scanner unit 4. A code for transmitting image data to the main body 1 side, 11 is a CPU for controlling the image processing operation of the main body 1, 1
2 is a selector for outputting the input image data to either the binarization circuit 13 or the halftone processing unit 14, 13 is a binarization circuit for binarizing the input image data, and 14 is an input A halftone processing unit for performing a halftone process on image data, a latch circuit 15 for reading and holding the mode selection information of the mode selection switch 43 on the hand scanner unit 4 side, and a digital image data for input analog image data 16 An A / D conversion circuit for converting the image data into a display format, a display control section 17 for converting the read image data into a display format and displaying it on the display section, an image memory section 18 for storing the image data,
Reference numeral 19 is an OR gate that takes an OR condition between the sampling signal output from the CPU 11 and the sampling signal output from the timing generator 20, and 20 is the latch circuit 1.
5, a timing generator that periodically outputs a sampling signal for reading the mode selection state of the mode selection switch 43, 41 is a CCD that photoelectrically converts an image on a document (not shown) into image data, and 42 is a reading start of the document. Reading start switch for notifying the CPU 11 of
Reference numeral 43 is a mode selection switch for selecting whether to perform binarization processing or halftone processing on the read image data.

FIG. 2 is a view showing an example of the external appearance of the document reading apparatus of this embodiment shown in FIG. In this example, the hand scanner unit 4
A mode selection switch 43 is provided on the side, and the operator switches the mode selection switch 43 while manipulating the hand scanner unit 4 even during the reading of a document to perform binarization processing on the read image data, or an intermediate value. It is possible to arbitrarily set whether to perform the adjustment processing.

Next, the operation of this embodiment will be described. First, when reading an original, the operator sets the main body 1 by switching the mode selection switch 43 to perform binarization processing or halftone processing of the input image data. After that, when the operator holds the hand scanner unit 4 and starts scanning the original, the operator presses the reading start switch 42 to notify the CPU 11 of the main body 1 of the start of reading the original. As a result, the CPU 11 causes the OR circuit 19 to operate in the latch circuit 15.
A sampling signal is output via this to operate this circuit 15 so that the latch circuit 15 holds the mode selection state of the mode selection switch 43. The selector 12 follows the selection state of the switch held in the latch circuit 15,
When the binarization processing is performed, the input image data is output to the binarization circuit 13, and when the halftone processing is performed, the input image data is output to the halftone processing unit 14.

In this state, when the reading start switch 42 of the hand scanner section 4 is pressed to start reading the original, the image data read by the CCD 41 is transferred to the A / D on the main body 1 side via the code 5. It is input to the conversion circuit 16 and digitized here. The digitized image data is output by the selector 12 to either the binarization circuit 13 or the halftone processing unit 14. For example, when the mode selection switch 43 is initially switched to the binarization processing side, since the latch circuit 15 holds the binarization processing selected state, the selector 12 outputs the input image data as 2 bits.
Switching to output to the digitization circuit 13. The binarization circuit 13 binarizes the input image data and then outputs it to the display control unit 17 and the image memory unit 18. The display control unit 17 converts the input image data into a display format as shown in FIG.
Is displayed on the display unit 2. The image memory unit 18 stores the input image data. After that, when the mode selection switch 43 is switched to the halftone processing side in the middle of this reading, the latch circuit 15 receives the sample signal periodically input from the timing generator 20 via the OR gate 19, and the mode of the mode selection switch 43 is changed. Read and hold the selected state. Therefore, at this time, the selector 12 switches to output the input image data to the halftone processing unit 14. The halftone processing unit 14 performs halftone processing on the input image data and then outputs it to the binarization circuit 13. Subsequent operations are the same as the above-described binarization processing, and the halftone-processed image data is displayed on the display unit 2 and the image data is stored in the image memory 18.

According to the present embodiment, even when the mode selection switch 43 for selecting the binarization processing or the halftone processing of the input image data is switched during the reading of the image data, the main body 1 side The selector 12 operates to change the processing mode. Therefore, as shown in FIG. 5, the document 1 in which the document portion A and the photograph portion B are mixed
When 00 is read, the document portion a can be read by the binarization processing and the photograph portion b can be read by the halftone processing, and thus such read image processing of the original can be optimally performed. Further, since the mode selection switch 43 is provided on the side of the hand scanner unit 4, the operator can easily switch the processing mode of the input image data while the manuscript is being read by the hand scanner unit 4.

[0015]

As described above, according to the image reading apparatus of the present invention, even after the reading of the original is started, the image data read in the middle is switched between the binarization processing and the halftone processing. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image reading apparatus of the present invention.

FIG. 2 is a perspective view showing an external appearance example of the image reading apparatus shown in FIG.

FIG. 3 is a perspective view showing an external appearance example of a conventional image reading apparatus.

FIG. 4 is a block diagram showing a detailed configuration example of the image reading apparatus shown in FIG.

FIG. 5 is a diagram showing an example of a read document.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body 4 ... Hand scanner part 5 ... Code 11 ... CPU 12 ... Selector 13 ... Binarization circuit 14 ... Halftone processing part 15 ... Latch circuit 16 ... A / D converter 17 ... Display control part 18 ... Image memory part 19 ... OR gate 20 ... Timing generator

Claims (1)

[Claims] 1. According to the switching state of the changeover switch,
In an image reading apparatus capable of setting either binary processing or halftone processing of image data read by a scanner, a switching state of the changeover switch is periodically changed during an image reading period of the scanner. Depending on the reading means for reading and the switching state of the switch read by the reading means, the image data read by the scanner is directly binarized or subjected to halftone processing and then binarized. An image reading apparatus comprising: a mode control unit that selects and switches one of the two.