JPS62154974A - Original reader - Google Patents

Abstract

PURPOSE:To read both of a document part and a photograph part on one original with optimum density by specifying areas on the originals and converting the image in the specified area and an image which is not in the area into binary signals by different binary coding means. CONSTITUTION:An area specification control circuit 26 controls the switching of a switch circuit 15 according to a line synchronizing signal (LSYNC) and a clock (CLK) supplied from a master timing circuit 20 and area data supplied from a CPU 19. Further, the CPU 19 controls the switching of switch circuits 13 and 14 according to a mode specified on an operator panel 27 and also outputs a density specifying signal to a simple binary-coding circuit 11 and a dither binary-coding circuit 12 according to density set on the operator panel 27, thereby outputting a density signal to a serial-parallel converting circuit 16. An area specifying board 60 is used to set a readout area.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a document reading device that is used, for example, in an image information filing device and two-dimensionally reads a document to be filed.

[Technical background of the invention and its problems] Conventionally, when reading an image of a document, a document reading device used in an image information file device simply scans the entire surface of the document in two
Binarization is performed using binarization means such as digitization or dithering. As a result, text manuscripts are read by simple 2fi conversion means, and photographic manuscripts are read by binarization means using dithering or the like.

However, it has not been possible to separate a single document into a text portion and a photographic portion and read the document using separate binarization means. For this reason, when a document contains both text and photographs, only one of them can be read faithfully.

Therefore, when a single manuscript contains both text and photographs, devices are being developed that can faithfully read both.

However, in this case, the text portion and the photo portion were read at the same density, making it impossible to optimally read both the text portion and the photo portion.

[Object of the Invention] This invention has been made in view of the above circumstances, and its purpose is to provide a document reader that can read both the text and photographic portions of a single document with optimum density. The goal is to provide equipment.

[Summary of the Invention] In order to achieve the above object, the present invention specifies an area in a document, and binarizes an image within the area corresponding to the specification and an image outside the area using different binarization means. Alternatively, the image is gradated by a gradation means, and the density produced by the binarization means and the density produced by the gradation means are respectively switched by separate density switching means for reading.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a document reading device according to the present invention. That is, a document table (transparent glass) 1 that supports a document O is fixed to the upper surface of the main body (not shown). The document O placed on the document table 1 is exposed to an exposure lamp 2,
An optical system consisting of mirrors 3, 4, and 5 reciprocates along the lower surface of the document table 1 in the direction of arrow e, so that exposure and scanning are performed during the reciprocation. In this case, mirror 4
．． Mirror 5 moves at half the speed of mirror 3 so as to maintain the optical path length. The light reflected from the original O by the scanning of the optical system, that is, the light reflected from the original O by the light irradiation of the exposure lamp 2, is reflected by the mirror 3.4.5, passes through the lens 6, and passes through the line image sensor (COD). ) 7, and an image of the document 0 is formed on the line image sensor 7.

This line image sensor 7 converts the formed image into an electrical signal and outputs it to an A/D conversion circuit 9 via an amplifier 8. This A/D conversion circuit 9 includes an amplifier 8
The signal supplied from the line image sensor leaf is converted into a digital signal via the shading correction circuit 1.
Output to 0.

This shading correction circuit 10 performs shading correction on the supplied digital signal and outputs it to a simple binarization circuit (binarization means) 11 and a dither binarization circuit (gradation means) 12.

The simple binarization circuit 11 includes a shading correction circuit 1
The signal supplied from 0 is sent to character density setting key 4, which will be described later.
0.41, corresponding to the density designation signal supplied from the CPU 19, that is, comparing different slice levels for various densities, and if the signal is higher than the slice level, determines "white", Outputs the rOJ signal, and if the signal is below the slice level, determines "black" and sets it to "1".
Output a signal.

Further, the dither binarization circuit 12 converts the signal supplied from the shading correction circuit 10 into a density designation signal supplied from the CPU 19 in accordance with the settings of photographic density setting keys 33 and 34, which will be described later, for example. In other words, it is binarized using different dither patterns for various densities.
Outputs a ``0'' signal or a ``1'' signal. The output of the simple binarization circuit 11 is supplied to a serial-parallel conversion circuit 16 via switch circuits 13 and 15.

Further, the output of the dither binarization circuit 11 is transmitted to the serial-parallel conversion circuit 1 through switch circuits 14 and 15.
6. Each of the switch circuits 13 and 14 is connected to a white signal generating circuit 17 that always outputs an rOJ signal. The above serial-parallel conversion circuit 16
The signal converted into a parallel signal is outputted via the interface 18 to a control section (not shown) of an image file device (not shown).

Further, the CPU 19 as a control section controls the entire system according to a line synchronization signal (LSYNC) from the master timing circuit 20. That is, driver 21
By controlling this, the pulse motor 22 that moves the optical system is driven, and by controlling the driver 23, the exposure lamp 2 is driven. The CPU 6-19 also stores area data supplied from the area designation board 60 via the communication controller 24 in the area data storage area of the memory 25, and outputs the area data to the area designation control circuit 26. It has become.

This area designation control circuit 26 receives a line synchronization signal (LSYNC) supplied from the master timing circuit 20.
), a clock (CLK), and area data supplied from the CPU 19 to control switching of the switch circuit 15.

Further, the CPU 19 controls the switch circuit 13.1 according to the mode specified by the operator panel 27.
4 switching control, and the density designation signal is sent to the above-mentioned single I in accordance with the density set by the operator panel 27.
[Output to the i-binarization circuit 11 and dither binarization circuit 12,
The density signal is output to a serial-parallel conversion circuit 16.

The area designation board 60 is used to set a reading area. There are four modes for specifying this area: photo area, text area, masking area, and trimming area. The above area specification is done using the numeric keypad 78, 1)
A--Up to 3 areas can be set for a mat (one document). Furthermore, the contents of the set area designation can be stored in up to 10 formats.

The operator panel 27 is constructed as shown in FIG. In other words, page reversal key 3 for specifying page reversal.
1. A display 32 that lights up when the page inversion mode is activated by this page inversion key 31, a photo density setting key 33.34 that sets the reading density for the photo area, a setting density (5 levels) by this photo density setting key 33.34; ), a mode switching key 36 for switching and specifying the photo reading mode of photo fine, standard, and text clear, and displaying the photo fine, standard, and text clear modes switched by this mode switching key 36, respectively. Display 37.
38.39, Character 'al setting key for setting the reading density for the character area 40.41, this character density setting key 4
A display section 42 that lights up and displays the set density (5 levels) of 0 and 41, and a density switching key 43 that switches and specifies the density (resolution) for reading characters, that is, fine density and standard density.
, indicators 44 and 45 that light up to display the fine density and standard density set by the density switching key 43, respectively.
, a reading specification key 46 for specifying photo reading, text reading, mixed reading of photos and text, this reading specification key 46
Displays 47 and 48 light up to indicate the photo mode and text mode specified by , an original size specification key 49 and 50 that specifies the size of the original, and an original size specified by this original size specification key 49.50. Display section 51 displayed, automatic paper feed key 5 for selecting automatic paper feed
2. A display 53 that lights up to indicate when paper is automatically fed by the automatic paper feed key 52, and a display 54 that lights up to indicate whether or not it can be used.
, an indicator 55 that lights up to indicate a paper jam, and indicators 56 and 57 that lights up to indicate a failure 1.2.

Each of the above-mentioned indicators and display sections is composed of an LED.

The number of dither gradations is different among the photo reading modes, Photo Fine, Standard, and Text Clear, which are specified by the mode switching key 36, and the number of gradations for Photo Fine is r64J, and the number of gradations for standard is r32J. , the number of gradations for character clearing is "18". Further, the fine density specified by switching with the density switching key 43 is 16 lines/mm, and the standard density is 8 lines/mm.

FIG. 3 explains the configuration of the area designation control circuit 26. That is, command data supplied from the CPU 19 is supplied to the command register 100 and counters 102.103.104.105.106.107. Further, address data supplied from the CPU 19 is supplied to a command register 100 and counters 102 to 107 via an address decoder 101. The counters 102 to 107 also receive a line synchronization signal (LS) from the master timing circuit 2o.
YNC) and a clock (cLK) are supplied.

The above command register 1oo is the address decoder 10
The command data corresponding to the address supplied from 1 is selected and latched, and the contents of the latch are output.

The contents of this latch are "1
” signal or rOJ signal, and depending on whether it corresponds to area A, the output terminal will output a “1” signal or “
outputs a “0” signal, and outputs a “1” signal or a “0” signal from the output terminal C depending on whether it corresponds to area B,
From output 1d to F”IJ depending on whether it corresponds to area C or not.
It outputs a double signal or a "0" signal. As a result, data for each bit is output from output terminal a, a "1" signal is output from output terminal A for a period in the vertical direction (sub-scanning direction) of area A, and from output terminal C, a "1" signal is output from area B. The period in the vertical direction (sub-scanning direction) of
A "1" signal is output from the output end d for a period in the vertical direction (sub-scanning direction) of the area C.

The counters 102 to 107 are connected to the address decoder 10.
Set the command data, that is, the setting value, corresponding to the address supplied from 1, and output the fOJ signal until the setting contents and the count contents match, and when they match, "1"
It outputs a signal. In addition, counters 102 to 1
07 is configured to count up every supplied clock (CLK) and clear every line synchronization signal (LSYNC). The above counters 102.104.
The outputs of 106 are each AND circuit 108.110.1
12, and these AND circuits 1
The outputs of the counters 103, 105, and 107 are respectively supplied to the other input terminals of the counters 08, 110, and 112.

The outputs of the AND circuits 108.11o and 112 are each supplied to one input terminal of the AND circuit 114.115.116, and these AND circuits 114.115.776
The other input terminal of each is connected to the above command register 1.
The outputs of output terminals b1C and d of 00 are respectively supplied.

The outputs of the AND circuits 114, 115, and 116 are sent to an exclusive OR circuit (EOR circuit) 1 via an OR circuit 117.
18, and this EOR circuit 118
The output of the output terminal a of the command register 100 is supplied to the other input terminal of the command register 100. The output of the EOR circuit 118 is outputted to the switch circuit 15 as a switching signal.

FIG. 4 shows the operation section of the area designation board.

That is, the area designation board 6o is connected to the communication controller 24 via a cable 61. On the top surface of this area designation board 6o, there is a liquid crystal display section 62 that displays various modes and their coordinates, a mode change key 64 that is pressed when changing the mode, and a trimming area designation that is pressed when specifying the trimming area mode. key 65
, a masking area designation key 66 that is input when specifying the masking area mode, a text area specification key 67 that is input when specifying the text area mode, a photo area specification key that is input when specifying the photo area mode. 68, Online key 69 for switching between online and offline, Area storage key 70 used to store the contents of the set format (up to 10 formats) (coordinate data of up to 3 areas), and read out the stored format Area read key 71.
A designated confirmation key 72 that is input when confirming the area for one format on the image file device (not shown).
The specification end key 73 is pressed when the specification of the area for 1 fo 1 mat is completed, the area specification key 74 is pressed before the input when requesting to display the coordinate data of the previous area, and the area specification key 74 is pressed when requesting the display of the coordinate data of the next area. The next area designation key 75 is input, and the area deletion key 76 is input when clearing the coordinate data for one working area displayed on the liquid crystal display section 62.
, a correction key 77 that is input when partially correcting coordinate data, a numeric key 78 that inputs coordinate data, a * key 83 that is input after inputting coordinate data using the numeric keypad 78, and after inputting a memory number 83. Coordinate data for one engineering unit # key 84, which is pressed after inputting or when requesting to display area data;
It is composed of a display 79 that lights up when the power is turned on, a display 80 that lights up when online, a display 81 that lights up when designation is possible, and a designation confirmation display 82 that lights up to confirm designation.

The indicators 79 to 82 are composed of LEDs.

The electrical circuit of the area designation board 60 is shown in FIG. That is, a CPU (8085) 90 that controls the entire area designation board 60, a ROM 92 that stores a control program, and a RAM for data storage.
92, program timer 93, the display devices 79 to 82,
A serial interface 95 that exchanges data with the communication controller 24 via the cable 61, an input key matrix selector 97, and each of the keys 64 to 78.
, a liquid crystal display section 62, and a data bus 96 that connects each of the above sections. A memory backup battery is connected to the RAM 92. In addition, the above CP
U90. ROM92, RAM92, program timer 9
3. Display units 79-82, serial interface 95
is formed on a control circuit board, and input key matrix selector 97 and each of the keys 64 to 78 are formed on a keyboard board.

The photo area mode refers to a specified area (Area A, B), as shown in FIG. 6(a).

Reading of the image in C) is dithered binary reading, that is, reading of the photographic part, and reading of the image outside the designated area is simple binary reading, that is, reading of the character part.

The character area mode mentioned above is as shown in the same figure (b).
Reading images within the specified area (areas A, B, and C) is simple binary reading, that is, reading the text part, and reading images outside the specified area is dithered binary reading, that is, reading the photographic part. becomes. As shown in the figure (C), the above masking area mode means that the image within the specified area (Area A, B, C) will be read as white, and the image outside the specified area will be read as white. Reading is performed by reading characters using i2 values or reading photographs using dithered binary values (depending on the specification on the operator panel 27).

The above-mentioned trimming area mode means that the image within the specified area (A1B, C) can be read by simple binary text or dithered binary photo reading, as shown in (d) of the same figure. (Operator panel 27
(depends on the designation of the area), and reading an image outside the specified area will result in white reading.

Next, the area designation operation by the area designation board 6o will be explained with reference to FIGS. 7 and 8. That is, the document is sandwiched within a transparent package-like area scale (not shown) with a scale written on the surface. Then, use the area scale to read the dimensions of the area you want to specify, and use the coordinates (Xa,
Enter the coordinates (Xb, Yb) of the lower right corner. For example, in the photo area mode, enter "20" using the numeric keypad 78, enter the * key 83, and press the numeric keypad 78.
Insert "20" with , insert *key 83, insert "80" with numeric keypad 78, insert *key 83,
Enter fl 154 using the numeric keypad 78, and press the * key 83.
Alternatively, press the # key 84. As a result, the diagonally shaded area shown in FIG. 7 is designated.

Next, the operation in the above configuration will be explained. First, the case of specifying and storing an area will be explained using FIG. 9. That is, the operator places the document between area scales (not shown) and uses the area scales to read the dimensions of the desired area. Next, when the operator wants to specify a photo area, he presses the photo area mode designation key 68. Then, the CPtJ90 determines the photo area mode and displays on the LCD display 62 “Photo area, MO/#1, Xa=20, Ya=20°Xb-90
, Yb=90J. In response to this display, the operator uses the numeric keypad 78 and * key 83 to specify the upper left coordinates (Xa, Ya) and lower right coordinates (Xb
, Yb).

For example, the coordinates of point A' in area A shown in FIG.
= Input the coordinates of the point. Then, the CPU 90 calculates the coordinates, that is, the first format (MO)
A'', /M' are stored in the RAM 92 as the coordinates of #1).

If there is another area, the operator presses the next area designation key 75. Then, the CPU 90 determines the designation of the next area, and the LCD display section 62 displays [Photo area, MO/#2, X mini 70, Ya=80, Xb=130].
, Yb=130J is displayed. In response to this display, the operator uses the numeric keypad 78 and * key 83 to specify the upper left coordinates (Xa, Ya) and the lower right coordinates cxb of the area.
, Yb). For example, area B shown in Figure 9
Input the coordinates of point B'' and the coordinates of point B''. Then,
CPLJ90 has its coordinates, that is, the first format (M
B' as the second (#2) coordinate for O), B='
is stored in the RAM 92.

Furthermore, if there is another area, the operator inputs the next area designation key 75. Then, the CPU 90 determines the designation of the next area and displays on the liquid crystal display section 62 [Photo area, MO/#3, X mini 120, Ya=160SX, b
-160, Yb=200J is displayed. In response to this display, the operator uses the numeric keypad 78 and * key 83 to input the coordinates of the upper left end (Xa, Ya) and the coordinates of the lower right end (Xb, Yb) of the designated area. For example, the coordinates of point C' and the coordinate of point C'' in area C shown in FIG. 9 are input.

Then, the CPU 90 determines the coordinates, that is, the third (#3) coordinates for the first format (MO>), as C',
C″ is stored in the RAM 92.

Then, when storing the specified area, the operator presses the area storage key 70. Then, CPU9
0 on the LCD display 62. [Area City Memory Kioku Memory No.?] (,12,.

567.9) Display J. At this time, only empty memory numbers in which format data is not stored are displayed numerically. In response to this display, the operator presses, for example, the rOJ key and the * key 83 on the numeric keypad 78 to select the format number to be stored. As a result, the CPU 90 updates each area (#1) for the above format number (1).
, #2, #3) are stored.

Further, although the above-mentioned area designation is for the photo area mode, the area may be designated for other modes (text area mode, masking area mode, trimming area mode).

Furthermore, storage of areas for other formats (M1 to M9) can be performed in the same manner as storage for the first format (MO).

Next, reading of the format stored as described above will be explained. That is, the operator presses the area read key 71. Then, the CPU 90 determines that the area has been read, and displays on the liquid crystal display section 62 "Area City Memory No.? (0,,34,,,
8,) Display J. At this time, only the memory number where the format data is stored is displayed numerically. In response to this display, the operator may, for example, press r on the numeric keypad 78.
Insert the OJ key and * key 83 to select the format to read. With this selection, the CPU 90 selects the first area (#) of the corresponding format (MO>) from the RAM 92.
1) is read out, and the LCD display section 62 displays [Photo area, MO/#1, Xa-20, Ya-20, Xb-90,
Display yb-90J. Next, when the operator inputs the next area designation key 75, the CPU 90 determines the designation of the next area, reads out the contents of the second area (#2) of the corresponding format (MO>) from the RAM 92, and
“Photo area, MO/#2, Xa=
70. Display Ya-80°Xb=130, Yb=130J.

As described above, when an area is specified or when an area is read, the specification end key 73 is pressed. Then, the CPU 90 determines whether to transfer the data and displays “Photo Area City #” on the LCD display 62.
1, #2, #3 Data Tensou Chu! " is displayed. In addition, the CPU 90 also outputs area data (#1, #
2.3#) to the CPU 19 via the serial interface 95, cable 61 and communication controller 24.
Transfer to. When this transfer is completed, the CPU 90 displays “Photo Area City #1, #2, #3” on the LCD display 62.
"Genkou Yomitori OK Death" is displayed.

Next, the CPU 19 transfers the transfer data, that is, the area data (#1, #2, #3) for the format (MO>
is stored in the area data storage area in the memory 25.

At this time, since the area data is a photo area, the CPU
19 lights up the display in the middle of the display section 35.39 of the operator panel 27 and the display 38.44.47.48. At this time, the density of the photo is set to the photo temperature setting key 33.3.
4 to change the density of the characters, press the character setting switch key 40.4
1, and the character density cannot be changed. In this state, the original size and the like are selected and switched, and the respective densities for photographs and characters are selected, and the original O shown in FIG. 9 is placed on the original table 1.

Then, from an external CPU (not shown) of the image file device to the CPU 1 via the interface 18,
When a command signal to start document reading is supplied to CPU 9, CPU 1
9 controls the driver 19 to move the optical system, and also controls the driver 23 to turn on the exposure lamp 2. As a result, the light from the exposure lamp 2 is irradiated onto the original O,
This reflected light from the original 0 is guided to a line image sensor 7 via a mirror 3.4.5 and a lens 6.

Then, the line image sensor 7 converts the image formed by the guided light into a corresponding electrical signal and outputs it to the A/D conversion circuit 9 via the amplifier 8. This A/D
The conversion circuit 9 converts the signal supplied from the line image sensor 7 via the amplifier 8 into a digital signal, and outputs the digital signal to the shading correction circuit 10. This shading correction circuit 10 performs shading correction on the supplied digital signal,
and output to the dither binarization circuit 12. The simple binarization circuit 11 compares the signal supplied from the shading correction circuit 10 at a slice level corresponding to the density designation signal supplied from the CPU 19 in accordance with the setting of the character m degree setting key 40.41. , if the signal is above the slice level, it judges "white" and outputs the "O"signal; if the signal is below the slice level, it judges "black" and outputs "1".
” signal is output. Further, the dither binarization circuit 12 converts the signal supplied from the shading correction circuit 10 into a dither pattern corresponding to a density designation signal supplied from the CPU 19 in accordance with the settings of the photographic density setting keys 33 and 34. The rOJ signal or “1
” signal is output. The output of the simple binarization circuit 11 is supplied to a switch circuit 15 via a switch circuit 13. Further, the output of the dither binarization circuit 11 is supplied to a switch circuit 15 via a switch circuit 14.

Further, the CPU 19 adjusts the area data read from the area data storage area of the memory 25 and the processing timing of the simple binarization circuit 11 and the dither binarization circuit 12 in the sub-scanning direction and the main scanning direction in the document 0. The command data is output to the area designation control circuit 26. As a result, the count value "2o" is set in the counter 102 while the sub-scanning direction is "20 to 80J", and the counter 102 is set to the count value "2o".
3 is set to a count value of "90", a "0" signal is output from the output terminal a of the command register 100, and a "1" signal is output from the output terminal.

Then, when the sub-scanning direction is "80 to 90", the counter 1
02 is set to the count value "20", and the counter 103
The count value "90" is set to the counter 104, the count value "70" is set to the counter 105, the count value r130J is set to the counter 105, the rOJ signal is output from the output terminal a of the command register 100, and the output terminal c to “
1” signal is output.

Then, while the sub-scanning direction is from 90 to 13o, the counter 104 is set to a count value of 70;
5 is set to a count value r130J, the rOJ signal is output from the output terminal a of the command register 100, and the output terminal C
Outputs a "1" signal from. Then, the sub-scanning direction is “1”.
30 to 16o, the rOJ signal is output only from the output terminal a of the command register 100.

Then, when the sub-scanning direction is between "160 and 200", a count value N20J is set in the counter 106, a count value r140J is set in the counter 107, and a "0" signal is output from the output terminal a of the command register 100. , outputs a "1" signal from the output @d. Then, while the sub-scanning direction is from r200 to r220, a "0" signal is output only from the output terminal a of the command register 100.

Therefore, if the sub-scanning direction is "O~20" or "130~1",
6o'' and 1160 to 180'', the EOR circuit 118 outputs a 0 signal as a switching signal. As a result, the switch circuit 15 is switched to the simple binarization circuit 11 side. As a result, during the sub-scanning direction, the output of the simple binarization circuit 11 is supplied to the serial-parallel conversion circuit 16 via the switch circuit 13.15, and then via the interface 18 to the image file (not shown) side. is output to.

Also, when the sub-scanning direction is [20-80J, the main-scanning direction is [20-90J, the sub-scanning direction is [80-90J]
”, the main scanning direction is between “20-130”, the sub-scanning direction is between “90-13o”, the main-scanning direction is “70-130J”, and the sub-scanning direction is “160-130”.
The main scanning direction between ``20o'' and ``120~160''
During this period, the EOR circuit 118 outputs a "1" signal as a switching signal. As a result, the switch circuit 15 is switched to the dither 2tli conversion circuit 12 side. As a result, during the above period, the output of the dither binarization circuit 12 is changed to the switch circuit 14.1.
5 to the serial-parallel conversion circuit 16, and output to the image file (not shown) side via the interface 18.

As a result, as shown in FIG. 6(a), the images (photograph portions) within the designated area range (areas A, B, and C) are read using dither binary values, and the images outside the designated area range are (
An image signal in which the character portion) is read as a simple binary value is output.

Further, if the data transferred from the area designation board 60 to the CPLI 19 is area data for a text area, the same operation as in the case where the area data for the photo area is supplied. In this case, if the same area designation as above is supplied, the sub-scanning direction is "0~20", "13o~
160'' and between ``160 and 18o,'' the FOR circuit 118 outputs a ``1'' signal as a switching signal. As a result, the switch circuit 15 is switched to the dither binarization circuit 12 side. As a result, during the above period, the dither binarization circuit 1
The output of 2 is serially connected via switch circuits 14 and 15.
is supplied to the parallel conversion circuit 16, and the interface 1
8 to the image file (not shown).

Also, when the sub-scanning direction is between "20-80", the main-scanning direction is "20-90J", and the sub-scanning direction is between "180-90J".
J, the main scanning direction is between 20 and 130J, the sub-scanning direction is between 190 and 130, the main scanning direction is between 70 and 130, and the sub-scanning direction is between 160 and 130J.
If the main scanning direction is between "120 and 160"
During this period, the EOR circuit 118 outputs a "0" signal as a switching signal. As a result, the switch circuit 15 has a simple 2
It switches to the value conversion circuit 11 side. As a result, during the sub-scanning direction, the output of the simple binarization circuit 11 is changed to the switch circuit 13.
15 to the serial-parallel conversion circuit 16, and the above image file <
(not shown) side.

As a result, an image signal as shown in FIG. 6(b) is output.

Next, if the data transferred from the area designation board 60 to the CPU 19 is area data for the trimming area, the CPU 19 transfers the transferred data, that is, the area data (#1, #2, #3) for the format (MO) to the memory 25. The data is stored in the area data storage area within the area. At this time, since the area data is a trimming area, the CP
U 19 lights up the display in the middle of the display section 37 of the operator panel 27 and the display 38.47, and displays photos, letters,
Each key for reading designation can be switched. In this state, you can select photo mode, text mode, document size, etc.
At the same time, the document 0 shown in FIG. 9 is placed on the document table 1.
Place. At this time, in the case of photo mode, the CPU 19 switches the switch circuit 13 to the white signal generation circuit 17 side and switches the switch circuit 14 to the dither binarization circuit 12 side, and in the case of character mode, the CPU 19 switches the switch circuit 13 to the simple binary signal generation circuit 17 side. The switch circuit 14 is switched to the white signal generation circuit 17 side.

Therefore, in photo mode, if the above-mentioned area data is supplied, the sub-scanning direction is "0 to 20".
, "130-160", and "1160-180", the EOR circuit 118 outputs a "1" signal as a switching signal. As a result, the switch circuit 15 is switched to the dither binarization circuit 12 side. As a result, during the sub-scanning direction, the output of the dither binarization circuit 12 is changed to the switch circuit 14.
15 to the serial-parallel conversion circuit 16, and the image file (
(not shown) side.

Also, if the sub-scanning direction is between "20 and 80" (if the main scanning direction is between "20 and 90", the sub-scanning direction is between "80 and 90"
When the main scanning direction is between "20 and 130", when the sub-scanning direction is between "90 and 130", the main scanning direction is between r70-130J, and when the sub-scanning direction is 116
If the main scanning direction is between "120 and 1"
60'', the EOR circuit 118 outputs r as a switching signal.
Outputs OJ signal. As a result, the switch circuit 15 is connected to the binary conversion circuit 11 side, that is, the white signal generation circuit 17.
Switch to the side. As a result, during the above period, the white signal generation circuit 1
The output of 7 is serially connected via switch circuit 13.15.
is supplied to the parallel conversion circuit 16, and the interface 1
8 to the image file (not shown).

As a result, an image signal as shown in FIG. 6(d) is output.

Also, when the text mode is selected, the same operation as in the photo mode is performed.

Furthermore, even if the data transferred from the area designation board 60 to the CPU 19 is area data for a masking area, it operates in the same way as in the case of trimming,
An image signal as shown in FIG. 6(C) is output.

As mentioned above, you can specify an area in a document, and simply combine images within the area and images outside the area according to this specification.
Since the document is binarized and read using a digitization circuit or a dither binarization circuit, when a text part and a photograph part coexist in one document, both can be read faithfully. Also, you can specify multiple areas above.
You can specify the areas overlappingly. moreover,
It is possible to switch the density of either the text portion or the photographic portion of the one document to the optimum density, and each can be read at the optimum density.

In the above embodiment, dithering is used as a binarization means for producing gradation, but other gradation may be used, for example, a gradation means for generating several levels of density for each dot may be used. . Further, although area specification is performed using an area specification board, area data may be supplied from an external image file device.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a document reading device that can read both text portions and photographic portions on one document at optimal density.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a diagram schematically showing the overall configuration, FIG. 2 is a plan view showing the configuration of the operator panel, and FIG. 3 is the configuration of the area designation control circuit. FIG. 4 is a plan view showing the configuration of the area designation board, FIG. 5 is a block diagram showing the circuit configuration of the area designation board, FIG. 6 is a diagram showing examples of output images in each mode, and FIG. Figure 8 is a diagram showing an example of area designation, Figure 8 is a diagram showing an example of the LCD display and key operations to explain area designation in Figure 7, and Figure 8 is a diagram showing an example of area designation. be. ○...Original, 1...Original table, 8...Line image sensor, 11...Single I [12 value conversion circuit, 12...
Dither binarization circuit, 13.14.15...Switch circuit, 17...White signal generation circuit, 19...CPU, 2
4...Communication controller, 25...Memory, 26.
...Area designation control circuit, 27...Operator panel, 35.39...Display section, 33.34...Photo density setting key, 40.41...Text density setting key, 60.
...Area specification board, 100...Command register, 101...Address decoder, 102-107...
-Counter, 118...EOR circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 4 Figure 5
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2 Zheng Bodingbian Ren - 0pn ' l ' l 11+
ll 1 1''A A I l11--1111 EwaaB, 1 '-+ 1 11111 Figure 8 (Momeyabu Mukai) Figure 9

Claims (1)

[Claims] In a document reading device that reads an image of a document on a document table, converts it into a two-dimensional signal, and outputs it, a conversion means converts the image of the document into an electrical signal, and a signal converted by the conversion means is compared at a slice level. a gradation means for giving a gradation to the signal converted by the conversion means; a designation means for designating an area on the document; a control means for controlling the image inside the area and the image outside the area to be read separately by a binarization means or a gradation means; and a first density switching means for switching the density of the binarization means; A document reading device comprising: second density switching means for switching the density of the gradation means.