JPH0583522A - Copy machine with area editing function - Google Patents

Abstract

PURPOSE:To provide the copy machine with area editing function which can automatically set a judgement level without dispersion in the case of judging the presence/absence of a marker attached to an original. CONSTITUTION:In a step ST1, the white part of a reference original coloring the first half in white and the latter half in red concerning an original scanning direction, for example, is read and in a step ST2, an output from a CCD image sensor is stored in a memory after A/D conversion. In a step ST3, the image sensor reads the red part of the reference original. In a step ST4, respective color outputs from the CCD image sensor are stored in the memory after A/D conversion. In a step ST5, after the reference original is completely read, a CPU calculates the average values of digital signals corresponding to analog signal outputs from the image sensor concerning the white and red parts of the reference original. In steps ST6, ST7 and ST8, the CPU respectively calculates a gain A, upper limit luminance level VH and lower limit luminance level VL by using the average values calculated in the ST5, and these calculated values are stored in the memory in a step ST9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine with an area editing function capable of editing and copying an area corresponding to the position of a marker attached to a document.

[0002]

2. Description of the Related Art In a copying machine for copying an original image on a sheet, processing such as trimming, masking, in-area color copying, and out-of-area color copying is performed in an area corresponding to the position of a marker attached to the original (hereinafter, There is a copier with an area editing function that can perform area editing.

This conventional copying machine with an area editing function includes a marker determination circuit, and a marker attached to an original is read by a CCD (photoelectric conversion element) image sensor included in the scanner, and the CCD image sensor is operated. By comparing the output with a predetermined determination level by a marker determination circuit, the presence or absence of the marker and the color of the marker are determined.

FIG. 8 is a block diagram showing a structure of a marker judging circuit included in a conventional copying machine having a region editing function.

As shown in the figure, a conventional marker determination circuit
Reference numeral 10 is a color component separation circuit 11, sample and hold circuits 12, 13 and 14, operational amplifiers (op amps) 15, 16 and 17, and an adder.
18 and 19, comparators 20, 21 and 22, AND circuits 23 and 24, and variable resistors 25, 26 and 27.

The output from the CCD image sensor when the marker attached to the original is read is input to the marker determination circuit 10, and the color component separation circuit 11 outputs a red component output (R), a green component output (G) and It is separated into the blue component output (B). These separated outputs R, G and B are
Levels are held by the sample hold circuits 12, 13 and 14, respectively.

Output signal V of sample hold circuit 12
_R is amplified A times by the operational amplifier 15, and the signal V _RA
Is output.

Output signal V of the sample hold circuit 13
_G is added to the output signal V _B of the sample hold circuit 14 by the adder 18, and the operational amplifier 16 outputs the signal V _{G + B.}

Output signal V of sample hold circuit 14
_B is added to the output signals V _R and V _G by the adder 19, and the operational amplifier 17 outputs the signal V _{R + G + B.}

Next, in the comparator 20, the signal V _RA and the signal V _{G + B} are compared, and when V _RA > V _{G + B} , the output of the comparator 20 becomes H (high) level.

In the comparator 21, the signal V _{R + G + B} is compared with the brightness upper limit level V _H, and when V _H > V _{R + G + B} , the output of the comparator 21 becomes H level.

In the comparator 22, the signal V _{R + G + B} is compared with the brightness lower limit level V _L, and when V _L <V _{R + G + B} , the output of the comparator 22 becomes H level.

Finally, AND circuits 23 and 24 take the logical product of the output signals of the comparators 20, 21 and 22, and when all the output signals are at the H level, the pixel of the marker read by the CCD image sensor is It is determined to be red.

In this conventional marker judging circuit 10, the gain A of the operational amplifier 15, the brightness upper limit level V _H and the brightness lower limit level V _L , that is, the judgment levels are adjusted by the variable resistors 25, 26 and 27, respectively. These adjustments are performed by a human by reading a reference document colored in a reference color, for example, red, through a CCD image sensor.

[0015]

In such a conventional copying machine with a region editing function, it is necessary to manually adjust the variable resistance included in the marker judgment circuit when adjusting and setting the judgment level. However, there is a problem that the variation in the value of the adjusted and set determination level becomes large and that the adjustment takes time.

Therefore, the first invention of the present application provides a copying machine with an area editing function, which can automatically adjust and set the determination level for determining the presence or absence of a marker attached to a document without variation. To do.

Further, in order to confirm whether the output from the document reading portion such as the CCD image sensor is normal, for example, a synchroscope must be used, which is a troublesome confirmation.

Therefore, a second invention of the present application is to provide a copying machine with an area editing function, which can easily determine whether or not an abnormality has occurred in a document reading portion.

[0019]

A first invention of the present application is a copier with a region editing function for performing a copy by editing a region corresponding to a position of a marker attached to a document, and reads the document. An original reading unit, a determination unit that determines the presence or absence of a marker by comparing an output level of the original reading unit when the marker is read by the original reading unit with a predetermined determination level, and a reference original is read by the original reading unit. And a setting unit configured to calculate the determination level based on the output level of the document reading unit at the time when the document is read and set the calculated determination level to a predetermined determination level of the determination unit.

According to a second aspect of the present invention, in addition to the means provided in the first aspect of the present invention, an abnormality occurs in the document reading means based on the output level of the document reading means when the reference document is read. A determination means for determining the presence or absence of

[0021]

According to the first aspect of the present invention, the setting means determines the presence or absence of the marker attached to the document based on the output level of the document reading means when the reference document is read by the document reading means. It is automatically adjusted by calculating the judgment level of. The setting unit further sets the calculated determination level as a predetermined determination level to be compared with the output level of the document reading unit in the determination unit when the marker is read by the document reading unit. Therefore, the determination level can be automatically adjusted and set without variation.

According to the second invention of the present application, the determining means determines whether or not there is an abnormality in the document reading means based on the output level of the document reading means when the reference document is read. Therefore, it is not necessary to use another device for confirming the presence or absence of the abnormality, and it is possible to easily determine the presence or absence of the abnormality in the document reading means.

[0023]

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

FIG. 2 is a side sectional view showing an embodiment of the construction of a copying machine with a region editing function according to the first invention of the present application.

As shown in the figure, the copying machine 30 with a region editing function of this embodiment has a photosensitive drum 31, a cleaner unit 32, a charging unit 33, a blank lamp 34, a color developing tank 35, and a main developing tank 36. , Transfer charger 37, peeling charger 38, copy lamp 39, first mirror 40, second mirror 41, third mirror 42, fourth mirror 43, fifth mirror 44, sixth mirror 45, CCD A unit 46, a lens unit 47, a paper tray 48, a manual paper tray 49, a suction conveyance belt 50, a heat roller type fixing unit 51, a paper discharge roller pair 52, and a document table 53 are provided.

Cleaner unit 32, charging unit 33, blank lamp 34, color developing tank 35, main developing tank 36,
The transfer charger 37 and the peeling charger 38 are arranged around the photosensitive drum 31 according to a known manner.

Copying of the original image is performed as follows.

The original placed on the original placing table 53 is illuminated by the copy lamp 39, and the light reflected by the original image is reflected by the first mirror along the optical path indicated by the alternate long and short dash line in FIG.
40, second mirror 41, third mirror 42, fourth mirror 4
The electrostatic latent image is formed on the surface of the photoconductor drum 31 by exposing the original to the surface of the photoconductor drum 31 through the third, fifth mirror 44 and sixth mirror 45.

The electrostatic latent image formed on the surface of the photosensitive drum 31 is formed by the color developing tank 35 and the main developing tank 36.
It is visualized as a toner image.

The paper supplied from the paper tray 48 or the manual paper tray 49 is the photosensitive drum 31 and the transfer charger 37.
It is conveyed to the transfer position between the and. At this transfer position, the toner image formed on the surface of the photosensitive drum 31 is transferred onto the sheet by the transfer charger 37.

The sheet on which the toner image is transferred is sent to the fixing unit 51 by the suction conveyance belt 50, and after the transferred image is fixed, it is ejected from the pair of ejection rollers 52. Thus, the copying of the original image is completed.

Next, the structure of the control device included in the copying machine 30 with the area editing function of this embodiment will be described.

FIG. 3 is a block diagram showing the configuration of the control device 60 included in the copying machine 30 with the area editing function shown in FIG.

As shown in the figure, the control device 60 of this embodiment is configured to control various operations of the copying machine 30 with a region editing function, and is a main control for controlling the entire copying machine as a whole. A unit 61 and a CCD control unit 62 that mainly controls the CCD unit 46 and the blank lamp 34 are provided.

The main control section 61 inputs / outputs (I /
O) Interface circuit 61a, central processing unit (CP
U) 61b, and for example a random access memory (RA
It includes a memory 61c consisting of M).

The CPU 61b is connected to the memory 61c, and includes a drive unit 63 including a mirror motor 54, a main motor 55 and the like included in the copying machine 30 with an area editing function shown in FIG. Unit 3
3, a blank lamp 34, a color developing tank 35, a main developing tank 36, a process / developing unit 64 including a transfer charger 37 and a peeling charger 38, and a suction conveyance belt 5
0, a paper feed / conveyance unit 65 including a pair of discharge rollers 52 and a registration roller 56, a fixing unit 51, an operation panel 66 not shown in FIG. 2, an optical unit 67 including a copy lamp 39 and a lens unit 47. And I / O interface circuit 61a. Also, CPU61b
Is connected to an automatic double-sided unit 68 (not shown in FIG. 2) for copying double-sided originals so that it can communicate via a data communication line.

The CCD control unit 62 includes a CPU 62a, a memory 62b including a RAM, a CCD drive circuit 62c,
It includes a blank lamp drive circuit 62d and a marker determination circuit 70.

The CPU 62a is connected to the memory 62b, and the optical unit 67 and the CCD unit 46 are connected to the CCD.
It is connected through the drive circuit 62c. CPU62a is C
It is connected to the CD unit 46 through a marker determination circuit 70, and is connected to the blank lamp 34 by a blank lamp drive circuit 62.
connected through d.

The CPU 61b of the main control section 61,
The CPU 62a of the CCD control unit 62 is connected so as to be able to communicate via a data communication line.

Next, the structure of the marker determination circuit 70 will be described.

FIG. 4 is a block diagram showing the structure of the marker judging circuit included in the control device of the copying machine 30 with the area editing function shown in FIG.

As shown in the figure, the marker determination circuit 70 of this embodiment includes a color component separation circuit 71 and a sample hold circuit 7.
2, 73 and 74, operational amplifiers 75, 76 and 77, adders 78 and 7
9, comparators 80, 81 and 82, AND circuits 83 and 84,
A / D (analog / digital) converter 85 and D
A / A (digital / analog) converters 86, 87 and 88 are provided.

The difference between the marker judgment circuit 70 of this embodiment and the conventional marker judgment circuit 10 shown in FIG. 8 is that the judgment level of the marker judgment circuit 70 (the gain A of the operational amplifier 75, the upper limit of the luminance input to the comparator 81). Based on the output of the CCD image sensor of the CCD unit 46 when the level V _H and the brightness lower limit level V _L input to the comparator 82 are read, the CP of the CCD control unit 62 is determined.
That is, the marker determination circuit 70 is configured so that it is automatically adjusted and set by U62b.

For this purpose, the marker judging circuit 70 has an A / D converter 85 for converting the analog output from the CCD image sensor into a digital value.

The CCD unit 46 is an embodiment of the document reading means of the first invention of the present application. The CPU 62b is an embodiment of the setting means of the first invention of the present application. The marker judging circuit 70 is an embodiment of the judging means of the first invention of the present application.

Next, the operation of the marker determination circuit 70 will be described.

As will be described later, when the copying machine with the area editing function of this embodiment operates in a predetermined mode, the marker judgment circuit 70 operates as follows.

The analog output of the CCD image sensor when the reference document is read is A / D converted by the A / D converter 85, and the CPU 62a receives the converted digital value from the A / D converter 85, gain A, and upper limit of brightness. The level V _H and the brightness lower limit level V _L are calculated, and those values are stored in the memory 62b.

Therefore, in the area edit copy mode in which the area is edited, the CPU 62a reads out the values of these judgment levels from the memory 62b, and the D / A converters 86, 87 and 88.
The judgment level is set by outputting to each.

The automatic setting of the gain A, the brightness upper limit level V _H and the brightness lower limit level V _L will be described.

FIG. 1 is a flow chart for explaining the operation of the marker judgment circuit 70 in the judgment level automatic adjustment mode of the copying machine with the area editing function according to the first invention of the present application.
FIG. 5 is a histogram schematically showing the output of the CCD image sensor when the reference document is read.
5A and 5B schematically show the outputs of the CCD image sensor when the white part and the red part of the reference original are read. FIG. 6 is a chart showing an example of the output of the CCD image sensor and the input levels of the comparators 80, 81 and 82 when a document with colored markers is read.

The horizontal axes of FIGS. 5 and 6 are shown on an arbitrary scale, and the vertical axes of the histograms schematically showing the outputs of the CCD image sensors of FIGS. 5 and 6 are shown on a relative scale. ..

The copying machine 30 with the area editing function shown in FIG.
In addition to the area edit / copy mode, which is the operation mode for area editing, the operation is possible in the judgment level automatic adjustment mode for adjusting the judgment level. These operation modes can be switched via an operation panel not shown in FIG.

When adjusting and setting the judgment level, the operation mode is switched to the judgment level automatic adjustment mode via the operation panel. At this time, the CPU 62a included in the CCD control unit 62 controls the operation of the marker determination circuit 70 as follows.

As shown in FIG. 1, first, in step ST1, a reference original for adjusting the determination level is placed on the original placing table 53 provided in the copying machine with the area editing function. As the reference original, for example, an original in which the first half is colored white and the latter half is red in the scanning direction of the original can be used.

Then, for example, by pressing the copy button on the operation panel, scanning of the reference document is started and the white portion of the reference document is read. That is, when the copy lamp 39 shown in FIG. 2 is turned on and the white portion of the reference document is scanned,
The reflected light from the reference document is input to the CCD image sensor of the CCD unit 46, and the CCD image sensor outputs an analog signal according to the reflected light.

The CCD image sensor has, for example, 640 pixels, and each of the 640 pixels outputs R (red), G (green) and B (blue) components. The analog signals V _Rn (white), V _Gn (white), and V _Bn , which are the output of each pixel of the CCD image sensor when scanning the white portion of the reference document
(White) (where n is 1 to 640) is as shown in FIG. 5 (A), for example.

Next, in step ST2, the analog signal V _Rn (white) output from the CCD image sensor,
V _Gn (white) and V _Bn (white) are input to the A / D converter 85 shown in FIG. 4 and converted into digital values, and then stored in the memory 62b via the CPU 62a.

Next, in step ST3, the CCD image sensor reads the red portion of the reference document as the scanning progresses. Analog signals V _Rn (red), V output from the CCD image sensor when scanning the red part of the reference document
_Gn (red) and V _Bn (red) are as shown in FIG. 5 (B), for example.

Then, in step ST4, the analog signal V output from each pixel of the CCD image sensor is output.
_Rn (red), V _Gn (red) and V _Bn (red) are input to the A / D converter 85, converted into digital values, and then stored in the memory 62b.

Next, at step ST5, when the reading of the reference document is completed, the CPU 62a causes the analog signals V _Rn (white) and V _Gn (white) output from all the pixels of the CCD image sensor for the white and red parts of the reference document. ), V
Average values V _R (white), V _G (white) of digital signals corresponding to _Bn (white), V _Rn (red), V _Gn (red) and V _Bn (red),
Calculate V _B (white), V _R (red), V _G (red) and V _B (red), respectively.

[0062] Then, in step ST6, ST7 and ST8, the average value V _R CPU 62a is calculated in step ST5
(White), V _G (white), V _B (white), V _R (red), V
_The gain A, the brightness upper limit level V _H, and the brightness lower limit level V _L are calculated using _G (red) and V _B (red), respectively.

Next, in step ST9, the calculated gain A, brightness upper limit level V _H and brightness lower limit level V _H are calculated.
The value of _L is stored in the memory 62b.

The determination levels such as the gain A, the brightness upper limit level V _H and the brightness lower limit level V _L are determined in step ST6,
In ST7 and ST8, they can be obtained by the following equations, respectively.

A = [{V _G (white) + V _B (white)} + {V _G (red) + V
_B (red)}] / {V _R (white) + V _{R (red)} V H = [{V} R ( white) + V _G (white) + V _B (white)} +
{V _R (red) + V _G (red) + V _{B (red)}] / 2 V L =} V R ( red) + V _G (red) + V _B (red) as described above -0.2 V, the determination level (The gain A of the operational amplifier 75, the brightness upper limit level V _H input to the comparator 81
And the lower limit luminance level V _L input to the comparator 82)
Are automatically set in the judgment level automatic adjustment mode.

When performing normal area edit / copy, the copying machine is switched to the area edit / copy mode by the operation panel, the original to be copied is scanned, and the marker attached to the original is read by the CCD image sensor. Meanwhile, the area is edited and copied.

Next, the operation of the marker judgment circuit 70 for judging the presence / absence of a marker attached to a document in the normal area edit / copy mode will be described.

As the document is scanned, C of the CCD unit 46
The output from the CD image sensor is input to the marker determination circuit 70. At this time, the CPU 62a controls the gain A, the brightness upper limit level V _H and the brightness lower limit level V _L stored in the memory 62b as described above. Read the value of D
/ A converters 86, 87 and 88, respectively.

The D / A converter 86 is connected to the operational amplifier 75 and determines the gain A of the operational amplifier 75.

The D / A converter 87 compares the voltage of the brightness upper limit level V _H of the output of the CCD image sensor with the comparator 81.
Then, the D / A converter 88 outputs the voltage of the brightness lower limit level V _L to the comparator 82.

When the document is scanned, the output from the CCD image sensor is input to the marker determination circuit 70, and the color component separation circuit 71 outputs a red component output (R), a green component output (G) and a blue component output ( It is separated into B). These separated outputs R, G and B are used as a sample hold circuit.
Leveled by 72, 73 and 74 respectively.

Output signal V of sample hold circuit 72
_R is amplified A times by the operational amplifier 75, and the signal V _RA
Is output.

Output signal V of sample hold circuit 73
_G is added to the output signal V _B of the sample hold circuit 74 by the adder 78, and the operational amplifier 76 outputs the signal V _{G + B.}

Output signal V of sample hold circuit 74
_B is added to the output signals V _R and V _G by the adder 79, and the operational amplifier 77 outputs the signal V _{R + G + B.}

Next, in the comparator 80, the signal V _RA and the signal V _{G + B} are compared, and when V _RA > V _{G + B} , the output of the comparator 80 becomes H (high) level.

In the comparator 81, the signal V _{R + G + B} is compared with the brightness upper limit level V _H, and when V _H > V _{R + G + B} , the output of the comparator 81 becomes H level.

In the comparator 82, the signal V _{R + G + B} is compared with the brightness lower limit level V _L, and when V _L <V _{R + G + B} , the output of the comparator 82 becomes H level.

Finally, AND circuits 83 and 84 take the logical product of the output signals of the comparators 80, 81 and 82, and when all the output signals are at the H level, as shown in FIG.
The marker pixel read by the CCD image sensor is determined to be red.

Therefore, according to the above-described embodiment, the judgment level is automatically adjusted and set, so that there is no variation in the value of the adjusted judgment level. Further, since the determination level is automatically adjusted by reading the reference document, it can be performed in a short time.

By the way, in the conventional adjustment of the judgment level by the variable resistance, the adjustment value of the judgment level is fixed corresponding to the value of the adjusted variable resistance, so that, for example, when reading an original image with a dark background or the original cover. When reading a document image with the open, there is a difference between the judgment level adjusted by the variable resistance and the desired judgment level according to the document type and copy mode, and the margin for color judgment decreases. There is. Such a situation similarly occurs between the determination level automatically adjusted by the CPU 62a in the above-described embodiment and the desired determination level according to the type of document and the copy mode.

In order to secure a sufficient margin for this color judgment, the copying machine with the area editing function is constructed so that the judgment level can be increased or decreased in accordance with the type of original or the copy mode in the judgment level automatic adjustment mode. It is possible to

For this reason, in another embodiment of the copying machine with the area editing function according to the first invention of the present application, the operation panel shown in FIG. 3 provided in the copying machine so that the type of the original can be selected. 66 is provided, and for example, when the background of the document is dark, a predetermined mode corresponding to the case where the background of the document is dark is selected via the operation panel 66 shown in FIG.

As shown in FIG. 3, the main control section 61 of the copying machine with the area editing function, through the operation panel 66, CCD-controls the information that a predetermined mode corresponding to the case where the background of the document is dark is selected. CPU 62a of section 62
To the gain A based on this information.
The values of the brightness upper limit level V _H and the brightness lower limit level V _L are recalculated, and the calculation results are output to the D / A converters 86, 87 and 88.

For example, in the case of a document with a dark background, the CCD
Since the output of the image sensor is generally lower than that of a normal document, the CPU 62a controls the operation panel 66 so that the values of the upper limit brightness level _VH and the lower limit brightness level _VL are smaller.
The determination level can be obtained based on the information input from.

According to this embodiment, the judgment level can be automatically changed to an appropriate value according to the type of the original to be copied and the copy mode, so that the margin of color judgment becomes large, and therefore the marker reading error occurs. Can be eliminated.

Next, an embodiment of a copying machine with an area editing function according to the second invention of the present application will be described.

The construction of the copying machine with the area editing function of this embodiment is the same as the construction of the copying machine 30 with the area editing function according to the first invention of the present application described with reference to FIGS. 2, 3 and 4. Is. However, in the operation of the copying machine with the area editing function of this embodiment, the marker judging circuit 70 automatically determines the judgment level in the judgment level automatic adjustment mode of the copying machine 30 with the area editing function according to the first invention of the present application. At the same time as the adjustment operation, check the output signal of the CCD image sensor,
If there is an abnormality, an alarm can be displayed.

FIG. 7 is a flow chart for explaining the operation of the marker judgment circuit in the judgment level automatic adjustment mode of the copying machine with the area editing function according to the second invention of the present application.

As shown in the figure, the contents of the operation in steps ST11 to ST19 are the same as those in steps ST1 to ST9 of the flowchart shown in FIG. However, in this embodiment, a step for discriminating the occurrence of an abnormality in the CCD image sensor or the like is added between step ST14 and step ST15.

That is, when step ST14 ends, the step
In ST20, the analog signals V _Rn (white), V _Gn (white), V _Bn (white), V _Rn output from the CCD image sensor
With _respect to the digital signals corresponding to (red), V _Gn (red) and V _Bn (red), it is determined whether or not these signals are normal.

The following conditions, for example, can be adopted for determining the occurrence of the abnormality.

(1) No output from the CCD image sensor.

(2) Part of the output of the CCD image sensor is not output.

(3) The output of the CCD image sensor is too lower than the predetermined value.

(4) The output of the CCD image sensor is higher than the predetermined value.

(5) The difference between the data of the white part and the data of the red part of the reference document is too small than the predetermined value.

(6) The offset data of the output of the CCD image sensor is deviated.

(7) The component ratios of the outputs R, G and B of the CCD image sensor are wrong.

As a result of collating with these determination conditions, if it is determined that there is an abnormality, the process proceeds to step ST21. When it is determined that there is no abnormality, the process proceeds to step ST15, and as described above with reference to FIG. 1, an operation of calculating the determination level for determining the presence or absence of the marker attached to the document and storing it in the memory 62b. To execute.

In step ST21, which is executed when it is determined that the output signal of the CCD image sensor is abnormal, the CCD
The CPU 62a of the control unit 62 is the main control unit
Information of the determined abnormal mode, that is, the determination condition by which the output signal is determined to be abnormal is transmitted to the CPU 61b of the 61 as alarm information.

Then, in step ST22, the CPU 61
b displays the fact on the operation panel 66 via the I / O interface circuit 61a, and ends the operation in the judgment level automatic adjustment mode.

Therefore, according to the above-described embodiment, by checking the output signal of the CCD image sensor during the operation of reading the reference document, it is possible to easily determine whether or not an abnormality has occurred in the CCD image sensor or the like. ..

The CPU 62a shown in FIGS. 3 and 4 is an embodiment of the discriminating means of the second invention of the present application.

Regarding the operation for automatically adjusting and setting the above-mentioned determination level and the operation for determining the occurrence of an abnormality in the CCD image sensor or the like, those operations are programmed in advance and shown in, for example, FIG. The program is stored in a ROM (read only memory) (not shown) included in the control device, and the CPU 61b or the CP
The copier may be configured so that the U62a reads and executes the program from this ROM.

[0105]

As described above, the first invention of the present application is a copier with a region editing function for performing a copy by editing a region corresponding to a position of a marker attached to a document.
An original reading unit that reads an original, a determination unit that determines the presence or absence of a marker by comparing an output level of the original reading unit when the marker is read by the original reading unit with a predetermined determination level, and a reference by the original reading unit Since the determination level is calculated based on the output level of the document reading unit when the document is read, and the setting unit that sets the calculated determination level to the predetermined determination level of the determination unit, therefore, It is possible to automatically adjust and set the determination level for determining the presence / absence of the marker attached to the document without variation.

According to the second invention of the present application, in addition to the means provided in the first invention of the present application, an abnormality occurs in the document reading means based on the output level of the document reading means when the reference document is read. Since the determination means for determining the presence / absence of the document is provided, it is possible to easily determine the presence / absence of an abnormality in the document reading means.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating an operation of a marker determination circuit in a determination level automatic adjustment mode of a copying machine with a region editing function according to a first invention of the present application.

FIG. 2 is a side sectional view showing an embodiment of the configuration of a copying machine with a region editing function according to the first invention of the present application.

FIG. 3 is a block configuration diagram showing a configuration of a control device included in the copying machine with a region editing function of FIG.

4 is a block configuration diagram showing a configuration of a marker determination circuit included in a control device of the copying machine with a region editing function of FIG.

FIG. 5 is a histogram schematically showing the output of the CCD image sensor when a reference document is read.

FIG. 6 is a chart showing an example of an output of a CCD image sensor and an input level of a comparator when a document with a colored marker is read.

FIG. 7 is a flowchart illustrating the operation of the marker determination circuit in the determination level automatic adjustment mode of the copying machine with the area editing function according to the second aspect of the present application.

FIG. 8 is a block configuration diagram showing a configuration of a marker determination circuit included in a conventional copying machine with a region editing function.

[Explanation of symbols]

 30 Copying machine with area editing function 46 CCD unit 60 Control device 62a CPU 70 Marker judgment circuit

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // G03G 15/04 120 9122-2H

Claims (2)

[Claims] 1. A copier with a region editing function for performing a copy by editing a region corresponding to a position of a marker attached to a document, the document reading unit reading the document, and the marker by the document reading unit. Determination means for determining the presence or absence of the marker by comparing the output level of the document reading means when a document is read, and the document reading when a reference document is read by the document reading means. A copying machine with a region editing function, comprising: a determination level that is calculated based on the output level of the means; and a setting means that sets the calculated determination level to a predetermined determination level of the determination means. 2. A discriminating unit for discriminating whether or not an abnormality has occurred in the document reading unit based on an output level of the document reading unit when the reference document is read. Copier with the area editing function described.