JPH08139903A - Image processing unit and image processing method - Google Patents

Abstract

PURPOSE: To simply apply edit processing to an original with simple configuration at a low cost and to select different resolution for each range. CONSTITUTION: A binarization processing section 6 applies binarization processing to image data read by an original read section 1 and a density discrimination section 2 discriminates markers in the original based on the density of the image data. A counter of a control signal generating section 5 counts the number of picture elements of a specific color after filter processing in a discrimination area set by a discrimination area setting section 4, and an output processing section 7 uses a different resolution in the main scanning direction/subscanning direction of a concerned line or a succeeding line from that of other lines when the count is a set value or over and provides the output of the binarization processing result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus such as a facsimile.

[0002]

2. Description of the Related Art Conventionally, in an image processing apparatus such as a facsimile, an original 102 is illuminated by a light source 101 such as a fluorescent lamp as shown in FIG. 21, and the reflected light is converted into an electric signal by a photoelectric conversion device 103 such as a CCD. Instead, the correction / A / D conversion device 104 performs correction processing such as shading correction and analog / digital conversion processing to obtain multi-valued image data.

When binary image data is required for an output image such as a facsimile, the multi-valued image data is sent to the binarizing circuit 105 and binarized by a certain threshold value to obtain an output image. . For example, in the case where the multi-valued image data represents the density of a document, a portion having a density equal to or higher than a threshold appears as black, and a portion having a density lower than the threshold appears as white. Is printed out.

In such a facsimile, there is a case in which it is not necessary to send the original or there is a portion which is not desired to be sent, and the original may be edited and sent.
For example, even if there are a plurality of originals, it may be necessary to transmit only one part of each original. In such a case, a necessary part is cut out and pasted on another sheet and then the original is transmitted, or a part which is not desired to be transmitted is hidden and the original is read before being transmitted.

When performing the editing work for cutting and pasting originals in this way, an extra work is required in addition to the transmission, and it is necessary to make a separate copy of the originals to be saved, which is very complicated. Met.

As an image processing apparatus for solving this point, as shown in FIG. 22, a necessary portion in the original is surrounded by a marker such as a highlighter pen, and a marker portion 111 is detected by a color scanner provided in the reading section. FIG. 23 based on the result.
It is generally known that there is a function of performing editing such as deletion of image data as shown in, or that having a function of inputting an area to be edited in advance into an input device in the device and performing editing according to the input result. ing.

[0007]

However, the above-mentioned conventional image processing apparatus has the following problems.

The above-mentioned method of judging the marker portion using the color scanner increases the cost as compared with the case of using the monochrome scanner. Further, in the method of inputting a region edited in advance into the input device in the device, an input device for specifying the region is required in addition to the image processing device, and as a result, there are problems such as an increase in cost and complication of the device. .

Further, although photographs and large characters can be read at low resolution, characters and thin line portions may be difficult to read unless the resolution is high. In order to deal with such a case, in the conventional image processing apparatus, it is necessary to separately provide a range designation input device and the like, and it is impossible to switch the resolution by the range designation without providing such a device. Met.

In view of the above-mentioned conventional problems, the present invention is an image processing apparatus and an image processing apparatus having a simple structure and a low cost, which can easily perform an original editing process and can change the resolution for each range. The purpose is to provide a method.

[0011]

In order to achieve the above object, the image processing apparatus of the first invention comprises a reading means for reading an original and outputting the read result as image data for each pixel, and the reading means for reading. Binarizing means for performing binarization processing of the obtained image data, judging means for judging a specific color portion in the original on the basis of density or luminance data of the image data read by the reading means, and output of the judging means. Filtering means for filtering the results, determination area setting means for setting the determination area of the specific color portion, counting means for counting the number of pixels of the specific color portion after the filtering processing in the determination area, When the count result of the counting means is equal to or more than a set value, the resolution of the line or the next line is changed from that of the other line and the binarization is performed. It is obtained and output means for outputting the binarization result of the stage.

In order to achieve the above object, the image processing apparatus of the second invention is a reading means for reading an original and outputting the reading result as image data for each pixel; and an image data read by the reading means. Perform value conversion process 2
Valuing means, deciding means for deciding a specific color portion in the original on the basis of the density or luminance data of the image data read by the reading means, filtering means for filtering the output result of the deciding means, and the identifying means. When the determination area setting means for setting the determination area of the color portion, the counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, and the count result of the counting means is equal to or more than a set value Only in the next line, there is provided output means for performing processing of not outputting the image which is the binarization processing result of the binarization means and collectively outputting the images over a plurality of pages.

To achieve the above object, an image processing apparatus according to a third aspect of the present invention comprises a reading means for reading a document and outputting the read result as image data for each pixel, and an image data read by the reading means. Perform value conversion process 2
Valuing means, deciding means for deciding a specific color portion in the original on the basis of the density or luminance data of the image data read by the reading means, filtering means for filtering the output result of the deciding means, and the identifying means. When the determination area setting means for setting the determination area of the color portion, the counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, and the count result of the counting means is equal to or more than a set value Only in the next line, there is provided output means for performing processing for outputting an image which is the result of the binarization processing by the binarization means and collectively outputting the images over a plurality of pages.

In order to achieve the above object, an image processing method according to a fourth aspect of the present invention comprises a reading process for reading a document and outputting the read result as image data for each pixel, and an image data read by the reading process. A binarization process for performing binarization, a determination process for determining a specific color portion in a document based on the density or luminance data of the image data read by the reading process, and a filter for filtering the processing result of the determination process. Execution processing, determination area setting processing for setting the determination area of the specific color portion, count processing for counting the number of pixels of the specific color portion after the filter processing in the determination area, and count result of the count processing Is greater than or equal to the set value, the resolution of the line or the next line is changed from that of the other line and the processing result of the binarization processing is changed. It is obtained so as to perform an output process of force.

[0015]

According to the image processing apparatus of the first aspect of the present invention, the binarizing means binarizes the image data read by the reading means, and the judging means determines the density or brightness of the image data. A specific color portion such as a marker in the document is determined based on the data. The counting means counts the number of pixels of the specific color portion after the filter processing in the determination area set by the determination area setting means, and the output means, when the count result is equal to or more than the set value, the line or the next line. For example, the resolution in the main scanning direction / sub scanning direction is changed from that of the other lines, and the binarization processing result is output.

According to the image processing apparatus of the second invention, the binarizing means performs the binarizing processing of the image data read by the reading means, and the judging means uses the density or the brightness data of the image data for the original document. A specific color portion such as a marker in the inside is determined. The counting means counts the number of pixels of the specific color portion after the filter processing in the judgment area set by the judgment area setting means, and the output means outputs the 2 in the next line only when the count result is equal to or more than the set value. The process of not outputting the image that is the result of the binarization process is performed, and the images over a plurality of pages are collectively output on, for example, one page.

According to the image processing apparatus of the third invention, the binarizing means performs the binarizing processing of the image data read by the reading means, and the judging means uses the density or the brightness data of the image data for the original document. A specific color portion such as a marker in the inside is determined. The counting means counts the number of pixels of the specific color portion after the filter processing in the judgment area set by the judgment area setting means, and the output means outputs the 2 in the next line only when the count result is equal to or more than the set value. A process of outputting an image that is the result of the binarization process is performed, and the images over a plurality of pages are collectively output as, for example, one page.

According to the image processing method of the fourth invention, the original is read, the read result is output as image data for each pixel, the read image data is binarized, and the density or brightness of the read image data is obtained. A specific color portion such as a marker in the original is determined from the data, and the processing result of the determination processing is filtered. Further, the determination area of the specific color portion is set, and the number of pixels of the specific color portion after the filter processing in the determination area is counted. Then, when the count result is equal to or more than the set value, the resolution of the line or the next line is changed from that of the other line, and the processing result of the binarization processing is output.

[0019]

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

FIG. 1 shows a first image processing apparatus according to the present invention.
It is a block diagram which shows the schematic structure of an Example.

In FIG. 1, reference numeral 1 denotes an original reading unit for reading an original and outputting multivalued data corresponding to the read density. On the output side of the original reading unit 1, a density determination unit 2 and a filter processing unit 3 are provided. It is connected. The density determination unit 2 has a function of determining the density of the multi-valued image data output from the document reading unit 1 to determine the marker portion written on the document, and the filter processing unit 3 includes the density determination unit. The density determination result of 2 is filtered.

On the output side of the filter processing section 3, a judgment area setting section 4 for setting the judgment area of the marker portion is connected,
A control signal generation unit 5 that generates a control signal for an output processing unit 7 to be described later based on the determination area setting result of the determination area setting unit 4 is connected to the output side.

On the other hand, the output side of the document reading section 1 is connected to the binarization processing section 6 via the filter processing section 3.
The binarization processing unit 6 is a circuit that performs binarization processing of multi-valued image data, and its output side is connected to the output processing unit 7 together with the output side of the control signal generation unit 5.

Further, a resolution conversion control section 8 for generating a control signal for resolution conversion and a sync signal generating section 9 for generating a sync signal of the apparatus are provided, and the sync signal generating section 9 causes the original reading section 1 to operate. , The filter processing unit 3, the determination region setting unit 4, the control signal generation unit 5, the output processing unit 7, and the resolution conversion control unit 8 to a synchronization signal (image clock,
The page sync signal PS, the line sync signal RS, etc.) are output.

Then, the output processing unit 7 performs output processing of the binarization processing result by the binarization processing unit 6 based on the control signals output from the control signal generation unit 5 and the resolution conversion control unit 8.

The operations of the density determination unit 2, the determination area setting unit 4, the control signal generation unit 5, the binarization processing unit 6, and the resolution conversion control unit 8 are controlled by the control unit 10.

The configuration and operation of each of the above components will be described in detail below with reference to FIGS.

FIG. 2 is a time chart showing the relationship between the image data and each sync signal.

The image data V read by the document reading section 1 is transferred in synchronization with the image clock. The page synchronization signal PS is a signal indicating the beginning of the document, and the rising edge of this signal is the start of the first line of the read document. The line synchronization signal RS is a signal representing the beginning of each line, and the rising edge of this signal is the beginning of each line (V11, V21, V31 in the figure).

FIG. 3 is a diagram showing a configuration example of the density determination unit 2.

Reference numerals 2-1 and 2-2 in FIG.
Is multi-valued image data sent from the document reading unit 1. THH and THL are density thresholds, which are set by the control unit 6 and have a relationship of THH> THL. The comparator 2-1 outputs "1" when THH> V, and the comparator 2-2 outputs "1" when THL <V. That is,
In the density determination unit 2, "1" when THL <V <THH
Is output.

FIG. 4 is a graph showing a density histogram of a felt-tip pen (red), a highlighter pen (marker), and a character portion. The horizontal axis represents the density value of multi-valued image data when one pixel is 6 bits (0 to 63), and the vertical axis represents the number of pixels within a certain area.

In the figure, the felt-tip pen portion has a density of 40.
The maximum number of pixels is around ˜50, the density is around 20 in the highlighter portion, and the density is around 62 and 63 in the character portion.
That is, it can be seen from this figure that the character portion and the marker portion can be separated by the density.

FIG. 5 is a diagram showing a circuit example of the filter processing unit 3 in the case of forming a 3 × 3 pixel matrix.

In the figure, 3-1 and 3-2 are line buffers capable of storing image data for one line, and R1 to R9 are registers for storing a 3 × 3 pixel matrix pattern. is there.

According to the filter processing unit 3, as shown in FIG. 6, the density determination result N output from the density determination unit 2 is displayed.
Is serially transferred in synchronization with the image transfer clock CLK and is input to the line buffers 3-1 and 3-2, and the image data V is input to the line buffer 3-1 in synchronization with the image transfer clock CLK. The broken line in FIG. 5 indicates the image data.

Further, the density determination result N output from the line buffer 3-1 in synchronization with the image transfer clock CLK.
Is input to the register R4 and the line buffer 3-2.
The image data V and the density determination result N are output from the line buffer 3-1 with a delay of one line, and the density determination result is sent from two lines and output from the line buffer 3-2.

Further, the image data and the density determination result input to the registers R1, R4 and R7 in synchronization with the transfer of the image data V are input to the registers R2, R5 and R8 and to the registers R2, R5 and R8. The image data and the density determination result are sequentially shifted to the registers R3, R6 and R9,
Construct a pixel matrix of × 3.

In the filter processing section 3, as shown in the circuit example of FIG. 5, when all of M1 to M9 are "1", "1" is set,
When even one of M1 to M9 is "0", "0" is output. By this filter processing, the density determination unit 2 prevents erroneous determination of the intermediate density portion of the edge portion of the character or figure and the highlight pen portion (marker).

FIG. 7 is a diagram showing a circuit example of the judgment area setting section 4.

By setting the judgment area by the judgment area setting unit 4, it is possible to prevent erroneous judgment of the marker portion written for purposes other than editing.

Reference numeral 4-1 in the figure is a counter, and when the LD input is "0", the initial value "0" is loaded in synchronization with the rising edge of the clock. 4-2 and 4-3 are registers, 4-4 and 4-5 are comparators, which compare the output of the counter 4-1 with the outputs of the registers 4-2 and 4-3, and when they are equal, Outputs "1". Reference numeral 4-6 is a JK flip-flop.

The operation of the judgment area setting unit 4 will be described with reference to the time chart of FIG.

In the example of FIG. 8, the third pixel from the beginning of the line is the start of the determination area and the tenth pixel is the end of the determination area. Note that the registers 4-2, 4
The set value of -3 is the value at the beginning and the end of the determination area, and the value is stored in the ROM or the like for each size of the read document or the position in the document.

When the line sync signal RS becomes "0", J
The output of the K flip-flop 4-6 becomes "0", and the initial value "0" is set in the counter 4-1 in synchronization with the image clock CLK. Line sync signal RS is "1"
In the case of, the counter 4-1 is synchronized with the image clock CLK.
Performs counting operation. When the output of the counter 4-1 becomes equal to the set value of the register 4-2, the output of the comparator 4-4 becomes "1", and the Q output of the JK flip-flop 4-6 becomes "1" in synchronization with the image clock CLK. "It becomes.

On the other hand, the output of the counter 4-1 and the register 4
When the set values of -3 are equal, the output of the comparator 4-5 becomes "1" and the Q output of the JK flip-flop 4-6 becomes "0" in synchronization with the image clock CLK. The section in which the Q output of the JK flip-flop 4-6 is "1" is the range of the determination area.

FIG. 9 is a diagram showing a circuit example of the control signal generator 5.

The example shown in the figure shows the case where the control signal of the next line is output when the number of pixels determined to be markers is constant.

In the figure, reference numeral 5-1 is a counter, which performs a counting operation in synchronization with the rise of the image clock CLK when the EN input is "1", and rises the image clock CLK when the LD input is "0". The initial value is loaded in synchronization with. Although the counter 5-1 shown in the figure is a hexadecimal counter, it is not limited to this. A D flip-flop 5-2 outputs the value of the D input to the Q output in synchronization with the rising of the image clock CLK when the G input is "0".

The operation of the control signal generator 5 will be described with reference to the time chart of FIG.

If the marker portion is present on the Nth line, the output of the filter processing unit 3 becomes "1". The counter 5-1 performs a counting operation in synchronization with the image clock CLK while in the determination area and while the filtering result is "1". When the filtering result is equal to or more than the set value in the judgment area, the RCO signal of the counter 5-1 becomes "1",
After that, the counting operation is not performed until the end of the line, and the state is maintained.

When the line synchronizing signal RS becomes "0", the D flip-flop 5-
The output of 2 becomes "1", this output is output throughout the N + 1th line, and the initial value is loaded into the counter 5-1.

When the control signal of the next line is output instead of the control signal of the next line, D
The counter 5-1 instead of the output of the flip-flop 5-2
The RCO output of 1 may be output as a control signal. After that,
The same operation is repeated while reading the original.

FIG. 11 is a diagram showing an example of the circuit of the binarization processing unit 6 which performs the simple binarization process.

Reference numeral 6-1 in the figure denotes multi-valued image data VD and 2
It is a comparator for comparing with the threshold value TH, and outputs “1” when VD ≧ TH. The threshold value TH is set in the register 6-2 by the control unit 10.

FIG. 12 is a diagram showing a circuit example of the output processing section 7.

In the figure, 7-1 and 7-2 are D flip-flops, 7-3 is a 3-input OR gate, and 7-4 is an inverter. When the output signal of the resolution conversion control unit 8 becomes "1", the D flip-flop 7-1 suspends its operation, which causes the same image to be continuously output from the D flip-flop 7-2 for two clocks. , The reduced image is output.

FIG. 13 is a block diagram showing the configuration of the resolution conversion control unit 8, and FIG. 14 is a time chart when the main scanning direction is reduced to 1/2.

Reference numeral 8-1 in the figure is a register for the control unit 10 to set the magnification. Reference numeral 8-2 is a calculation unit, which calculates a magnification in accordance with a preset magnification. A control signal generator 8-3 generates a control signal for enlargement or reduction according to the calculation result of the calculator 8-2. For example, in the case of 1/2 reduction in the main scanning direction, a reduction control signal is output every other clock as shown in FIG. Further, in the sub-scanning direction, the reduction control signal is output line by line.

Next, the overall operation of the image processing apparatus of the present embodiment, which is made up of the constituent elements having the above-described configurations and operations, will be described.

Although not shown, the image data read by the document reading unit 1 is subjected to shading correction, ABC processing, etc., analog / digital converted and serially transferred, and the density determination unit 2 and the filter processing unit. Sent to 3. In the density determination unit 2, the threshold values THH and THL set by the control unit 10 are compared, and THL <V <THH
Only in this case, “1” is output to the filter processing unit 3.

The output of the register R5 of the filter processing unit 3 is binarized by the binarization processing unit 6. The control signal generator 5 generates a control signal by the above operation from the output result of the filter processor 3. The output processing unit 7 reduces the image according to the output result of the control signal generating unit 5 and outputs binary image data. By this processing, a low-resolution image is output on the line where the marker is drawn, and a high-resolution image is output on the other parts.

The inverter 7-4 is removed from the circuit of the output processing unit 7 shown in FIG.
A high-resolution image is output for the line where the marker is drawn,
A low-resolution image is output in the other parts.

From the above, a low-resolution image can be obtained in the photographic part or a part that does not require high resolution.
In a facsimile or the like, the compression rate is improved, which leads to a reduction in transmission time.

FIG. 15 is a block diagram showing the schematic arrangement of the second embodiment of the image processing apparatus according to the present invention, and the elements common to those in FIG. 1 are designated by the same reference numerals.

The image processing apparatus according to the present embodiment is obtained by removing the resolution conversion control section 8 from the apparatus shown in FIG. 1 and replacing the output processing section 7 with an output processing section 7A as shown in FIG. The output processing unit 7A shown in FIG. 16 includes a D flip-flop 7A-1 and an OR gate 7A-2. When the output of the control signal generating unit 5 is "1", an image and a clock are not output. Has become.

Next, the operation of the present embodiment will be described mainly on the points different from the first embodiment.

The document reading unit 1 outputs a document detection signal to the control unit 10 when a document is set. Upon receiving the document detection signal, the control unit 10 issues a reading start command to the document reading unit 1 and the synchronization signal generating unit 9. The sync signal generator 9 which has received this read start command generates a page sync signal and a line sync signal to start reading an image.

The output processing section 7 outputs an image in accordance with the control signal from the control signal generating section 5. When the document reading unit 1 detects the end of the document and the next document is set, the control unit 10 issues a read interruption command to the synchronization signal generation unit 9 to interrupt the reading once.

When the next original is ready to be read, a reading restart signal is output, and thereafter, the same processing as that for the first page is performed. When the document reading unit 1 detects the end of the document again and the next document is not set, the control unit 10 controls the document reading unit 1 and the synchronization signal generating unit 9
A read end command is issued to and the reading ends.

In this case, for example, as shown in FIG. 18, two originals shown in FIGS. 17 (a) and 17 (b) can be collectively output as one sheet only where the marker M is not drawn. is there. This saves recording paper or shortens the transmission time in a facsimile or the like.

FIG. 19 is a block diagram showing the arrangement of the output processing section of the third embodiment according to the image processing apparatus of the present invention.
The same elements as those in FIG. 1 are designated by the same reference numerals.

The image processing apparatus of this embodiment is the same as the apparatus shown in FIG. 1 or 15, except that the output processing section 7 or 7A is replaced with an output processing section 7B as shown in FIG. That is, the entire apparatus of this embodiment is configured in the same manner as in the case of the first embodiment or the second embodiment except for the output processing section. The output processing unit 7B includes a D flip-flop 7
B-1, OR gate 7B-2, and inverter 7B-3
It consists of

According to the image processing apparatus of this embodiment, when the output signal of the control signal generator 5 becomes "1" in the output processor 7B, the D flip-flop 7B-1 outputs a binary signal in synchronization with the clock. An image as a result of the conversion processing is output, and when the output of the control signal generator 5 is "0", the clock is not output.

In this case, when the two originals of FIGS. 17A and 17B are processed, the result is as shown in FIG. 20, and the result opposite to that of the second embodiment is obtained and the marker is drawn. It is possible to output only the parts that have been added to one sheet. As a result, similarly to the second embodiment, the recording paper can be saved or the transmission time can be shortened in a facsimile or the like.

In the above embodiment, the document reading unit 1
Although the marker portion in the document is determined based on the density data of the image read by, the brightness data of the image may be used instead of the density data.

[0077]

As described in detail above, the image processing apparatus according to the first aspect of the present invention includes a reading unit, a binarizing unit that performs a binarizing process on image data read by the reading unit, and A determination unit that determines a specific color portion in the document based on the density or luminance data of the image data read by the reading unit, a filter unit that filters the output result of the determination unit, and a determination region of the specific color portion Determination area setting means for setting, counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, and if the count result of the counting means is a set value or more, the line or the next And the output means for outputting the binarization processing result of the binarization means by changing the resolution of each line from the other lines. Determining a particular color portion by the density data or luminance data of the image in the determination area, an image can be edited by the determination result. This makes it possible to easily edit a document with a simple structure and at low cost, and change the resolution such that, for example, a photograph part or a part that does not need high resolution is converted into a low-resolution image. be able to. Therefore, in a facsimile or the like, the compression rate is improved and the transmission time can be shortened.

According to the image processing apparatus of the second invention, only when the count result of the counting means is equal to or more than the set value, the processing which does not output the image which is the binarization processing result of the binarizing means is performed in the next line. , Since the images over multiple pages are collectively output, the image data is reduced,
In a facsimile or the like, there is an effect such that the transmission time is shortened by the improvement of the compression rate, or the recording paper is saved.

According to the image processing apparatus of the third invention, only when the count result of the count means is equal to or more than the set value, the processing for outputting the image which is the binarization result of the binarization means in the next line is performed. Since this is performed and the images over a plurality of pages are collectively output, the same effect as the second invention is obtained.

According to the image processing method of the fourth invention, a reading process of reading an original and outputting the read result as image data for each pixel, and binarizing the image data read by the reading process 2 A binarizing process, a judging process for judging a specific color portion in an original document based on the density or luminance data of the image data read by the reading process, a filter executing process for filtering the result of the judging process, A judgment area setting process for setting a judgment area of a specific color portion, a count processing for counting the number of pixels of the specific color portion after the filter processing in the judgment area, and a count result of the count processing is a set value or more. In this case, an output process of outputting the processing result of the binarization process by changing the resolution of the line or the next line from other lines. Because be executed, it is possible to obtain the same effects as the first aspect of the invention by a simple image processing method.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an image processing apparatus according to the present invention.

FIG. 2 is a time chart showing the relationship between image data and each synchronization signal.

FIG. 3 is a diagram showing a configuration example of a density determination unit 2.

FIG. 4 is a graph showing density histograms of a felt-tip pen, a highlighter pen, and a character portion.

5 is a diagram showing a configuration example of a filter processing unit 3. FIG.

FIG. 6 is a flowchart showing the operation of the filter processing unit 3.

FIG. 7 is a diagram showing a circuit example of a determination area setting unit 4.

FIG. 8 is a time chart showing the operation of the determination area setting unit 4.

FIG. 9 is a diagram showing a circuit example of a control signal generator 5.

FIG. 10 is a time chart showing the operation of the control signal generator 5.

FIG. 11 is a diagram showing a circuit example of a binarization processing unit 6 which performs a simple binarization process.

FIG. 12 is a diagram showing a circuit example of an output processing unit 7.

13 is a diagram showing a circuit example of a resolution conversion control unit 8. FIG.

FIG. 14 is a time chart when the main scanning direction is reduced to 1/2.

FIG. 15 is a block diagram showing a schematic configuration of a second embodiment of the image processing apparatus according to the present invention.

FIG. 16 is a diagram illustrating a circuit example of an output processing unit according to a second embodiment.

FIG. 17 is a diagram showing an image before processing in the second embodiment.

FIG. 18 is a diagram showing an image after processing in the second embodiment.

FIG. 19 is a block diagram showing a configuration of an output processing unit of a third embodiment of the image processing apparatus according to the present invention.

FIG. 20 is a diagram showing an image after processing in the third embodiment.

FIG. 21 is a block diagram showing a schematic configuration of a conventional image processing apparatus.

FIG. 22 is a diagram showing an image before being processed by the conventional image processing apparatus.

FIG. 23 is a diagram showing an image after being processed by a conventional image processing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 original reading section 2 density determination section 3 filter processing section 4 determination area setting section 5 control signal generation section 6 binarization processing section 7, 7A, 7B output processing section 8 resolution conversion control section 9 synchronization signal generation section 10 control section

Claims (4)

[Claims] 1. A reading unit for reading a document and outputting the read result as image data for each pixel, a binarizing unit for binarizing the image data read by the reading unit, and the reading unit. Judgment means for deciding a specific color portion in the original on the basis of the density or luminance data of the read image data, a filter means for filtering the output result of the judgment means, and a determination for setting a judgment area of the specific color portion. Area setting means, counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, if the count result of the counting means is a set value or more, the line or the next line Output means for outputting the binarization processing result of the binarization means while changing the resolution from other lines. Image processing device. 2. A reading unit for reading a document and outputting the read result as image data for each pixel, a binarizing unit for binarizing the image data read by the reading unit, and the reading unit. Judgment means for deciding a specific color portion in the original on the basis of the density or luminance data of the read image data, a filter means for filtering the output result of the judgment means, and a determination for setting a judgment area of the specific color portion. Area setting means, counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, and binarization in the next line only when the count result of the counting means is a set value or more An output unit that performs a process that does not output the image that is the result of the binarization process of the unit, and that outputs the images over a plurality of pages collectively. An image processing device characterized by the above. 3. A reading unit for reading a document and outputting the read result as image data for each pixel, a binarizing unit for binarizing the image data read by the reading unit, and the reading unit. Judgment means for deciding a specific color portion in the original on the basis of the density or luminance data of the read image data, a filter means for filtering the output result of the judgment means, and a determination for setting a judgment area of the specific color portion. Area setting means, counting means for counting the number of pixels of the specific color portion after the filter processing in the determination area, and binarization in the next line only when the count result of the counting means is a set value or more And an output unit for performing a process of outputting an image which is a result of the binarization process of the unit and collectively outputting the images over a plurality of pages. An image processing device characterized by the above. 4. A reading process of reading an original and outputting the read result as image data for each pixel, a binarization process of binarizing the image data read by the reading process, and a reading process of the reading process. Determination processing for determining a specific color portion in the original based on the density or luminance data of the obtained image data, filter execution processing for performing a filter processing on the processing result of the determination processing, determination for setting a determination area for the specific color portion Area setting processing, counting processing for counting the number of pixels of the specific color portion after the filter processing in the determination area, and if the count result of the counting processing is a set value or more, the line or the next line An image characterized by executing an output process of outputting the processing result of the binarization process while changing the resolution from other lines. Processing method.