JPS61123270A - Color picture processing system - Google Patents

Abstract

PURPOSE:To attain ease of print edition of a color picture by outputting an original picuture at an optional designating position on an original platen to an optional designated position on a transfer paper sheet. CONSTITUTION:Reflected light from an original face of a color original 3 is led to a rod array lens 5 of a scanning unit 4, the image is formed on a unmagnification color image sensor 6 and picture reading is executed sequential ly. An actuator 21 is fitted to the lower position of a scanning unit 4, and a position signal is obtained by a home position sensor 22-1 and a DTO sensor 22-2. An ITOP sensor 20 fixed to a main body on the circumference of a trans fer drum 16 and an actuator plate 19 fitted to the transfer drum 16 are arranged on the color printer section 2, and an original picture is transferred to an option al designation position on the transfer paper according to the related operation between the scanning unit and the sensor and actuator provided to a printer section.

Description

Detailed Description of the Invention [Technical Field 1] The present invention relates to a color image processing system such as a copying machine or a facsimile, and particularly to a case where read color images are sequentially printed out in real time, or a case where the system does not have an image memory. The present invention relates to a color image information reading device having an image control means for printing out an arbitrary specified image area on a document table onto an arbitrary specified area on transfer paper.

[Prior Art] Conventionally, in this type of digital color image processing system, an image at a fixed position on a document is output only at a fixed and specific position on a print image.

[Objective] It is an object of the present invention to provide a color image processing system that eliminates the above-mentioned drawbacks and outputs an image area at an arbitrary specified position on a document image to an arbitrary specified position on a print output. The purpose is

〔Example〕

The present invention will be described in detail below with reference to one drawing.

FIG. 1 shows an example of a schematic internal configuration of a digital color image processing system according to the present invention. A digital color image printing device (hereinafter referred to as a color printer) 2 is installed at the bottom.
and has. This color reader 1 reads the color image information of a document for each color using the color separation means described above and a photoelectric conversion element such as a CCD, and converts it into an electrical digital image signal. The color printer 2 is an electrophotographic laser beam color printer that reproduces a color image in each color according to the digital image signal, and records the image by transferring it to recording paper multiple times in the form of digital dots.

First, an overview of the color reader I will be explained. 3 is the manuscript, 4
is a document scanning unit that scans the document 3; The document scanning unit 4 includes a rod array lens 4, a same-magnification color separation line sensor (color image sensor) 6, and an exposure lamp 7. 8 is a wiring cord for the original scanning unit 4; 9 is a cooling fan; and 10 is an image processing section connected to the original scanning unit 4 through the wiring cord 8.

When the document scanning unit 4 moves and scans in the direction of arrow A in the figure to read the image of the document 3 on the document table, the exposure lamp 7 in the document scanning unit 4 is turned on at the same time, and the reflected light from the document 3 is transmitted to the rod array. The light is guided by a lens 5 and focused on a same-magnification color separation line sensor 6, which is a color information reading sensor.

Further, 21 is an actuator provided at the lower part of the document scanning unit 4, and 22-1 and 22-2 are position sensors that detect the scanning position of the document scanning unit 4 via the actuator 21, and are composed of microswitches and the like.

Next, an outline of the color printer 2 will be explained. Reference numeral 11 denotes a scanner, a laser output unit (see FIG. 5) that converts the image signal from the color reader l into an optical signal, a polygon mirror 12 of a polyhedron (for example, a dodecahedron), and a motor (not shown) that rotates this mirror 12. ), a tiθ lens (imaging lens) 13, etc.

14 is a reflecting mirror that changes the optical path of the laser beam, and 15 is a photosensitive drum. The laser beam emitted from the laser output section is reflected by the polygon mirror 12, and is reflected by the lens 13 and the mirror! 4, the surface of the photosensitive drum 15 is scanned planarly to form a latent image corresponding to the original image.

In addition, 17 is a primary charger, 18 is a full exposure lamp, and 23
is a cleaner section that collects residual toner that was not transferred;
24 is a pre-transfer charger, and these members are arranged around the photosensitive drum 15.

2B is a developing unit that develops an electrostatic latent image formed on the surface of the photosensitive drum 15 by laser exposure;
31Y, 31N, 31G, and 318 have photosensitive drums 15.
A developing sleeve that directly develops in contact with the 3G? , 30
11° 30G and 30BK are toner hoppers that hold spare toner, and 32 is a screw that transports developer. 2B, and these members are arranged around the rotation axis P of the developing unit. For example,
When forming a yellow toner image, yellow toner development is performed at the position shown in the figure, and when forming a magenta toner image, the developing unit 2B is rotated around the axis P shown in the figure, and the photoreceptor 15 is rotated. The developing sleeve 31M in the magenta developing device is placed in contact with the magenta developing device. Cyan and black development operate in the same way.

Further, 1B is a transfer drum that transfers the toner image formed on the photosensitive drum 15 onto paper, and 18 is a transfer drum 1.
7 cutuator plate for detecting the movement position of 8, 20
7 is a position sensor that detects when the transfer drum IB has moved to the home position by contacting the cutter plate 1s; 25 is a transfer drum cleaner;
27 is a paper press roller, 2B is a static eliminator, and 29 is a transfer charger, and these members 19.2G, 25.27.
29 is arranged around the transfer roller ie.

On the other hand, 35.38 is a paper feed cassette that stores paper (paper sheets), 37.38 is a paper feed roller that feeds paper from the cassette 35.38, and 39 and 40.41 are paper feed and conveyance timings. The paper fed and conveyed via these timing rollers is guided by the paper guide 4, and its leading edge is held by a gripper (see 51 in Fig. 5), which will be described later, and is wound around the transfer drum 1B, forming an image. Shift to the formation process.

50 is a peeling claw that removes the paper from the transfer roller 18 after the image forming process is completed; 42 is a transport belt that transports the removed paper; 43 is an image fixing unit that fixes the paper that has been transported by the transport belt 42 The image fixing section 43 has a pair of heat pressure rollers 44 and 45.

Next, the embodiment shown in FIG. 1 will be described in further detail with reference to FIG. 2 and the following drawings.

The above-mentioned equal-magnification type color separation line sensor 6 is 1, for example, as shown in FIG.
As shown in Todoroki), 82.51Lm (1/lea■)
It is constructed by arranging 5 chips with 1024 pixels in a staggered manner, with the area of the corner as one pixel, and each pixel is approximately 20.8 x 82. 5 hours
It is divided into three parts with the size of @, and color separation filters of B (blue), G (green), and R (red) are attached to each of the three parts, and when reading the image, the arrows in Figure 2 (Todoroki) are attached. The original is scanned in the same direction as the original 3 (see FIG. 1), and a color-separated image of the original 3 (see FIG. 1) is read.

FIG. 3(A) shows each color separation image data read by the 5-chip equal-magnification color separation line sensors (hereinafter referred to as color reading sensors) 101 to 105 arranged in a staggered pattern as 8-bit images. An example of a circuit configuration is shown in which the digital data is quantized and input to a color correction circuit (see FIG. 4) and an image data processing circuit (see FIG. 9 @ and FIG. 1O), which will be described later.

First, analog pixel signals color-separated into R, G, and H color components of the document 3 by the color reading sensors 101 to 105 mentioned above are amplified by the first stage amplifiers 106 to 110, and are amplified by the logarithmic (log) conversion circuit 111. ~115 is converted into a pixel density value. At this time, each image signal is serially transmitted in the order of R1 → G1 → Bl in synchronization with the pixel signal transfer low 2 (CLK) 201, as shown by Ag2G2 in the timing chart of FIG. 3(B). Output from color reading sensor.

Next, sample and hold circuit (S/) I) 118~
120, the sampling signal S/ shown in FIG.
The input image data is sampled and held at the timing of the HP 203, and then A/D converted by the analog/digital (A/mouth) converters 121-125 to convert it into 8-bit, 258-gradation image data. become

In this way, the color-separated and quantized image data is transmitted serially in a time-division manner as the color-separated data for the same pixel is serially transferred, as shown by 0^TA204 in the timing chart of FIG. , this data DATA204
In order to perform color correction processing using a color correction circuit (see FIG. 4) which will be described later, each DRs and D of the DATA 204 must be
Gt, DBI, (Here, R, G, and B correspond to Ray, Do, Green, and Blue, respectively. The same applies here.)
It is necessary to align them to the same phase in advance.

Therefore, it is a latch pulse with a one-hour phase difference.
LPR+ 205. LPGt 20B, LPB r
OR of DATA204 by 207, 口G, ,
DB, ---- are sequentially latched in the latch circuits 126 to 130, and the latch outputs LPR, t, pc, and LP of these latch circuits 12B-130 are used as the latch pulse CLC.
H) It is latched to the latch circuit 131 at the subsequent stage by 20B. As a result, the latch circuit 131 finally latches the color separation data of the same pixel in the same phase.

Furthermore, since the main color reading sensors 101-105 are arranged in a staggered manner as shown in FIG. Data for a plurality of lines is buffered and output to the next stage as one continuous line of image data OR, I]G, DB for each color of R, G, and H.

For the same pixel obtained as described above.

8-bit color-separated image data OR with aligned phase.

DC and DB are subjected to predetermined processing by the circuit shown in FIG. That is, the color correction circuit 135 in this figure performs the process disclosed in the following item 0, which is usually called masking, and the corner (black) plate generation and undercolor removal circuit 136 performs the process disclosed in the following item 0. Let's do it.

■Masking processing---The color correction circuit 135 performs the following operations on the input pixel data OR, DG, and OH301 to 303.
A matrix operation shown by the following equation (1) is performed to absorb unnecessary color components of the printing toner.

The coefficients ai, bi, and ci (i=1 to 3) are masking coefficients that should be set to appropriate values. Also, Y
, M, and C are output signals 304 to 30B corresponding to the colors yellow, magenta, and cyan.

(2) Corner plate generation and undercolor removal processing---In the corner plate generation and undercolor removal circuit 13B, the above-mentioned signal Y is input.

Minimum value of M, C MIX (Y, M, C) = k (constant)
When, Y' = Y-ak, M' = M-/3
The amount of toner to be printed Y', M', C' 307 to 309 is calculated by calculating 1c, C'=C-γ, and black printing is performed using 310 as a corner plate for the signal BK=δ of BK (black). used for Here coefficients α, β, γ,
It is assumed that δ is set to an appropriate value in advance.

Next, each image data Y' obtained by the circuit 13B described above
, M', C', BK 307-310
is the basic data of the toner image that is finally printed by the printer 2, but as described later, the color printer in this system uses Y (yellow) toner images and M (magenta) toner images. Image, C (cyan) toner image and BK (black) toner image cannot be printed out on transfer paper at the same time, so by sequentially transferring each toner image onto transfer paper and overlapping the four colors one after another, Since this is a printing method that obtains the final color print image, it is necessary to select each color data Y', M', C', 8K obtained by the circuit 13B described above in accordance with the operation of the color printer 2. be.

The next stage selector 137 is for this selection, and the selector 137 selects the above-mentioned four types of image data Y'.

Select one image data from M', C', and BK307-310. Therefore, in this system, 1
Reading and printing out one color image original requires four original exposure operations and four toner image forming processes.

Now, the color separation image 311 selected by the selector 137 described above in response to the operation of the color printer is separated into a character area 313 and a halftone image area 132 by the image area separation circuit 138, and is converted into a halftone image 312. The multi-value processing circuit 138 performs multi-value processing (usually referred to as dither processing) for the character area 313.
The digitization processing circuit 140 performs binarization processing using a single threshold value, thereby converting the image data transferred at the 8-bit 0258 gradation level into "1" 9.61 ON dot image data 314.degree. 315. This dot image data 314°315 is synchronous memory through 141! 42.

The synchronous memory 142 is a buffer memory necessary for sequentially printing out color-separated images read at the same time as the exposure scanning of the original according to the present invention without one color shift.
This synchronous memory! Before explaining the functions of these 142 and 143, an outline of the sequence control of the color printer 2 will be explained.

First, the image forming process of the laser beam color printer 2 of FIG. 1 will be explained according to the schematic diagram of FIG. 5.

The color-separated image signal read by the color reader I described above is developed into dot image data (dot data) through each circuit shown in FIG. 4, and the dot data corresponding to this color image is finally The laser beam LB is modulated by the laser output section 11L shown in the figure.

The laser beam LH modulated in accordance with the image data is transmitted by the polygon mirror 12 rotating at high speed in the direction of arrow A in Fig. 845.
A beam of laser light is scanned horizontally at high speed with a width of '-H, passes through the f/θ lens 13 and mirror 14, forms an image on the surface of the photosensitive drum 15, and performs r-ft exposure corresponding to the image data. The scan corresponds to one horizontal scan of the original image, and in this embodiment, the width is 1/18 mm.

On the other hand, since the photosensitive drum 15 is rotating at a constant speed in the direction of the arrow in the figure, the above-described laser beam scanning is performed in the main scanning direction of the drum, and the photosensitive drum 15 is rotated in the sub-scanning direction of the drum. is rotated at a constant speed, so that a planar image is finally exposed and a latent image is formed.Prior to this exposure, uniform charging by the charger 17 → the above-mentioned exposure → and toner development by the developing sleeve 31 For example, the first @ in a color reader is formed by toner development.
If the image is developed with the yellow toner of the developing sleeve 31Y in accordance with the original exposure scan, the image will be on the photosensitive drum 15.
A toner image corresponding to the yellow component of the document 3 is formed.

Next, the photosensitive drum 15 is placed onto the paper sheet 54 whose leading end is carried by the glyph par 51 and wrapped around the transfer drum IB.
A yellow toner image is transferred and formed by a transfer charger 29 provided at a contact point between the transfer drum 1g and the transfer drum 1g. The same processing process is applied to M (magenta), C (cyan), BK
By repeating the (black) image and superimposing each toner image on the paper sheet 54, a full-color image using four color toners is formed.

Thereafter, the paper sheet 54 is peeled off from the transfer drum IB by a movable peeling claw 50 shown in FIG.
4.45, the toner image on the paper sheet 54 is melted and fixed.

Next, Y and M are printed using the above-mentioned color reader l.

The color separation images corresponding to the C and BK toner images are read repeatedly, and the above-mentioned Y, M, C, and 8 toner images are sequentially color-shifted onto the paper sheet 54 carried on the transfer drum 16 in the color printer 2. Control of image reading and image printing timing to perform overlapping transfer with high precision without any problems will be explained with reference to Fig. 6.

In Figures 6 (A) and (B), T is the color original 3
It is the tip of The reflected light from the document surface of the color document 3 is guided to the A-RAD array lens 5 of the scanning unit 4 and forms an image on the 1-magnification color image sensor 6, and as the scanning unit 4 moves in the direction of the arrow in the figure, the sensor +6, image reading is performed sequentially.

On the other hand, an actuator 21 is attached to the lower part of the unit 4, and a home position sensor (SRz) 22-1 and a top sensor (SR,
) A position signal is obtained at position 22-2.6 Normally, stopping is performed based on the output signal of the home position sensor 22-1, and reading of the document is performed based on the signal of the DTOP sensor 22-2. .

In the color printer section 2, an image is written on the photosensitive drum 15 at a laser exposure level fiP)I. Also,
On the circumference of the transfer drum IB, there is a position sensor (SP, ) 20 fixedly installed on the main body (hereinafter referred to as the I-OP sensor) and an actuator plate attached to the transfer drum I6! 9 are arranged as shown in FIG. 5, and the leading end of the paper sheet 54 to which the toner image is transferred is held by the gripper 51 at the leading end point a of the cutter plate 1B.

In addition, the length of the actuator plate 13 on the horse is a fixed 2+
Δ sentence, and the HP sensor (S
R+) 22-1 and D-op sensor (SR2) 22-
It is slightly longer than the distance between the two.

First, when the position sensor (SP, ) 20 detects the tip edge a of the actuator plate 1θ on the transfer drum 16, which is rotating at a constant speed in the direction of the arrow (clockwise) in the figure, the document scanning unit 4 starts scanning. Before starting the movement (Fig. 6 (A)), the exposure scanning unit 4 detects the DTOP sensor (Fig. 6(A)).
SR2) When I came to 22-2.

Reading of the original and therefore writing to the synchronous memory 142 (see FIG. 4) is started. In other words, synchronous memory! 42 stores the color separated image read starting from the leading edge T of the original one line at a time.

On the other hand, on the printer z side, if the rear end of the seven cutter plates 19 on the circumference of the transfer drum 1B is detected.

From the time of detection of the trailing edge b, the above-mentioned synchronous memory 142
reading from the beginning of the image, and therefore, image writing on the photosensitive drum 15 by laser light modulation is started (see FIG. 6).
an.

Since the distance from the laser exposure position PM on the photosensitive drum 15 to the transfer position ↑r and the distance from the position a of the leading edge of one paper to Tr are set equal in advance, the distance from the leading edge T of the original 3 to the photosensitive drum 15 is set equal in advance. The synchronization memory 142 in the system of this embodiment has an image for 48 lines (ffiine), that is, 1a.
When an image is read at a scanning density of pel/m2, it has a storage capacity of 300cm width.The role of this synchronous memory and the reason for the storage capacity of 48JLine will be explained below.

In order to obtain a color image without color shift, as detailed above, the yellow component image of document 3 is first read and a yellow toner image is formed, and then the magenta component image is read. and a magenta toner image is formed, then a cyan component image is read and a cyan toner image is formed, and finally a black component image is read and a black toner image is formed, so the beginning of each image is always Accurate overlapping is essential.

Therefore, as described above, when the ITQP sensor 20 detects the tip a of the seven cutter plates 18 of the transfer drum 16, the exposure scan of the scanning unit 4 is started, and the
When the front OP sensor 22-2 detects the leading edge T of the original 3, it starts reading the original image and writing it to the synchronous memory 142, while the rear end of the actuator plate 19
At the same time as detected by the OP sensor 20, the synchronous memory 142
The image data is read from the photosensitive drum 15 and the image is written to the photosensitive drum 15.

However, since the transfer drum 1B rotates at a constant speed, it takes a certain period of time from when the I TOP sensor (SPt) 20 detects the tip a of the cutter plate to when it detects the rear end. Scanning unit 4 is at stop position S
R, (HP sensor) Start from 22-1 and SR2 (
As shown in FIG. 7, non-negligible variations occur in the time t until reaching the DTOP sensor) 22-2.

This variation is greatly influenced by conditions specific to the apparatus, such as friction between the scanning unit 4 and the main body due to its own weight, tension of the drive wire (not shown), fluctuations in the start-up characteristics of the drive motor, etc.

Therefore, the maximum value Δ of the variation in Figure 7 is set as a! It must be controlled so that the scanning distance does not exceed the capacity of the synchronous memory 142. In other words, the capacity of the synchronous memory 142 is selected so that the image data corresponding to the maximum value of the variation can be stored in the synchronous memory 142. There is a need. This Δ
If the capacity calculated from tmax is 48 inches for this device
The data capacity is e.

FIG. 8 shows an example of the structure of the above-mentioned synchronous memory 142.
As mentioned above, the scanning unit 4 is connected to the DTOP sensor (SR2
) When the document reaches the position 22-2, it starts reading the document and writes it into the synchronous memory 142 from the first line of the document, and when the trailing edge b of the seventh cutter plate 19 of the transfer drum IB is detected, the reading of the document starts from the first line of the document. Since the image data is read from the synchronous memory 142 and the image is written to the photosensitive drum 15, the above-mentioned variation 8tmax is absorbed by the synchronous memory 142.

Further, after detecting the tip a of the actuator plate l3 of the transfer drum IB mentioned above, the scanning unit 4 of the color reader l
After starting, the scanning unit 4 starts reading the leading edge T of the document before the rear end of the actuator plate 1!3 is detected. In other words, the detection of the DTOP sensor 22-2 is at least two lines ahead of the detection of the rear end of the actuator plate 1!3. Otherwise, the read/write sequence in the synchronous memory 142 will be reversed, and proper synchronization control will not be performed.

Therefore, in this system, as described below, the scanning unit 4 of the color reader l detects the tip a of the seven cutter plates 13 of the transfer drum 16 of the color printer 2.
Before starting the la! A delay means for providing an extension time (delay), and a delay means for providing a delay time (delay) from when the rear end of the actuator plate 18 is detected until the reading of image data from the synchronous memory 142 is started, Control is performed to ensure proper synchronization processing.

FIG. 9(A) shows an example of the start delay circuit of the scanning unit 4, and FIG. 9(B) shows a timing chart of the delay circuit. After inputting the scanning motor ON signal 212 that starts the scanning motor of 4, the 7th cutuator board! The delay counter 151 counts HSYNC by a predetermined number based on the AND condition of the detection signal (ITOP) 211 of the tip a of 8 and HSYNC (referred to as a horizontal synchronization signal or beam detection signal), and the count up of the counter 141 is increased. signal 21
5, the flip-flop 153 is set and outputs a scanning motor drive signal 214, thereby starting the color scanning unit 4 (see FIG. 9(B)).

Note that the count value N of the counter 151 that determines the amount of delay is set by a preset switch 152 or the like.

Further, the above-mentioned H5YNC21G is a synchronization signal output from the beam detector 53 in FIG. 5 once for each horizontal scanning line, and is always sent from the color printer 2 to the color reader 1. 52 in FIG. 5 is a reflecting mirror.

FIG. 1O shows a configuration example of a delay circuit for reading an image from the synchronous memory 142. When the rear end of the actuator plate 18 of the color printer 2 is detected, the detection signal (ITO
The flip-flop (F/F) 154 is set by P) 211, and the counting operation of the counter 155 is started.

The counter 155 counts H5YNC210 generated by the beam detector 53 (see FIG. 5), and uses the count-up signal 215 of the counter 155 to turn on the first stage F/F.
154 and the subsequent F/F 157.
Set the second stage F/F15? A read operation start signal 21B for the synchronous memory 142 is output from the synchronous memory 142. counter 15
The set value of 5 is set to an appropriate value by the preset switch 158.

Due to the set values of the counter means 151 and 155, the time from the start of writing image data to the synchronous memory 142 to the start of reading out image data varies.
The variation Δtmax in the time it takes to reach the position of the P sensor 22-2 is 48M1ns in terms of memory line.
24JL front and back based on the standard position so that it fits within
The synchronous memory 142 is set in advance to have a difference of .ine (see FIG. 8).

Therefore, the variation at this time is +24 line and -2 line.
Since it is possible to absorb up to 47 lines of 3 lines, appropriate memory synchronization control is always performed.

Next, referring to FIG. 10, the image area 401 on the document table 40G is read by the color reader l, and the color printer 2 specifies the diagonal line 404 on the transfer paper 403 (corresponding to 54 in FIG. 8). The coordinate point (xRl, ff
Rt ) and (XR2* yRz ) are the positions on the transfer paper (xPt + yPt ) and (!P2 , yPz
) corresponds to.

First, in the schematic diagram of this system in FIG. 11(A),
If there is no movement and the tip B of the document table 400 of reader 1
When starting image reading from a point (07Op position), the 7th cutter plate 13 on the 16th rotation of the transfer drum of the two printers is positioned at the position senna SP! If the exposure scanning section 4 is started when the scanner is at the positions a' to b' in FIG.
As already explained in FIG. 6, this corresponds to the normal mode (hereinafter, this will be referred to as normal mode).

Next, as shown in FIG. 11(A), consider making point P on the original (a position at a distance FRt from the leading edge B of the original in the sub-scanning direction) correspond to the leading edge a of the transfer paper. It can be seen that it is sufficient to start the N-light scanning section B earlier by the distance R1 than in the case of the normal mode described above.The following symbol LyYR1r indicating the distance is used.
TR2JPs +TP2Hb and H9YNC (
horizontal synchronization signal) 210. That is, if the scanning density is 18 pel/ms, the reading will be 18·l (am), for example.

In this mode (hereinafter referred to as the movement mode) in which the point P on the document corresponds to the leading edge d of the transfer paper as described above, two rotations of the transfer drum 1B are converted into one rotation as shown in FIG. 11CB).
During image formation, the first senna signal S of the sensor SP1
P, , ITOP are the reference signals for starting the exposure scanning section 4, and the second sensor signal IT of Senna SP1 is
Let OP2 be the reference signal for image writing.

That is, after moving (L-yRt) from point 81 of the first rise of ITOPs No. 8 (when the position a' of the 7 cutout plate 18 in FIG. 11(A) reaches the sensor SP), that is, When the exposure scanning unit 4 is started when the tip of the actuator plate 13 reaches position C,
When looking at the sensor signal ITOP2, this is equivalent to starting the exposure scanning section 4 retroactively by ffRt from the normal mode. Here, L is the transfer drum 1B
Let ffRt be the distance between a' and C'.

Therefore, the relationship between the color image sensor 6 of the exposure scanning section 4 and the transfer paper 403 at this time is such that the sensor B of the exposure scanning section is P
When the transfer paper 403 is at the point position, the leading edge of the transfer paper 403 is at the position marked ■ in the figure, and at this time, the color reader 1 reads the image and the color printer 2 writes the image at the PH point on the photosensitive drum 15. , the photosensitive drum 15 and the transfer drum I
After both B have moved by the distance shown in the figure, the transfer part position T
At point r, point P on the document and the leading edge a of the transfer paper match (hereinafter, this will be referred to as movement mode l).

Next, the actual distance between point P on the document and the leading edge of the transfer paper! P
Since it is necessary to control the image to be printed out on the transfer paper at a position shifted backward by I, the transfer paper, and hence the transfer drum 18, must be advanced by a distance YP+ compared to the above-mentioned movement mode 1. It is necessary to keep it. That is, to perform printing as shown in FIG. 1O, the tip a (or a') of the actuator plate 18 must be at position d in FIG. 11(A) for control in the sub-scanning direction. In other words, it is found that it is better to start the color image sensor B of the exposure scanning section 4 after rotating by a distance of (L-!R+ ÷yP+) from the leading edge of the sensor signal ITOP. (referred to as movement mode 2).

Therefore, the image reading operation on the color reader l side only needs to start reading scanning when the color image sensor 6 of the exposure scanning section 4 detects the position of the tip B of the document platen and moves by a distance y Rt. , on the color printer 2 side, the rear end edge b (or b') of the actuator plate 13
However, laser exposure may be started from a position moved by a distance P1 after being detected by the position sensor SP1.

FIG. 12 shows a configuration example of a hardware circuit for controlling the scanning position movement of the reader and printer described above, and FIG. 13 is a timing chart showing the timing of the signals in FIG. 12. A circuit block 420 in FIG. 12 is a circuit that delays the time from the detection of the leading edge of the actuator plate 18 to the start of the exposure scanning unit 4. The circuit block 420 in FIG. (L −ffRt +yPt
) is set.

Circuit blocks 430 and 440 respectively handle the delay from detection of D-top OP to the start of image reading, and the sensor signal ITOP.
2 to the start of the formation of a print image by laser exposure, and each rolling machine is
1 by the beam detector 53 of the printer 2 (see Figure 5).
A counter 43 receives a horizontal synchronization signal (H9YNC) generated by a laser beam detection signal detected once per horizontal scan.
It is determined by counting 1,441.

By the way, when changing the magnification, the reduction or enlargement in the sub-scanning direction is performed by changing the scanning speed of the exposure scanning section 4. For example, in the case of N-fold enlargement, the scanning speed is -11N, so the exposure scanning section The travel time is N times longer than when the image is at the same magnification. The positional relationship of position movement control at this time is shown in Figure 11 (C
) is basically the same as above, but with exposure scanning!
The time it takes for the 14 color image sensor B to start from the IP (home position) position and arrive at the reading area tip P point position is multiplied by N, so in order to move the position as shown in Figure 1O. Set signal 5E in Figure 12
TI, 5ET2 and 5ET3 are respectively 5ETIegL
-N (yP electric ◆ l ÷ intersection + TeP, ,
5ET2 NYP, .

5ET3 wealthffPt When the image is at the same magnification as described above, it corresponds to 1.

Next, position movement in the main scanning direction and magnification change control will be explained with reference to the drawings from FIG. 14 onwards. FIG. 14 shows an example of a control circuit that controls position movement in the main scanning direction.
Here, the circuit block 45G is a main-scanning effective period signal generation circuit for document reading, and the circuit block 480 is a main-scanning effective period signal generation circuit for the print position.

Corresponding to the case of Fig. 10, the set signal 5ET4 is changed to 5
ET4 waxRl, set signal 5ET5
5-(xR2-!R1) set signal 5ET8I:5ET
8! ! PI, set signal 5ET7? = (I
P2-xPl) and set these values in the corresponding left margin counters 451, 481 and bit counters 452, 482, the valid interval signals R, VENABLE and P, VENAB as shown in FIG.
LE is obtained.

This image reading main scanning effective period signal R,VIENA
BL! , and a main scanning effective period signal P of the print position,
VI! When the above-described write and read operations to the synchronous memory 142 are performed using NABLK, the above-described positional movement in the main scanning direction is achieved. That is, in FIG. 15, the data was written to the synchronous memory 142 between points 2 and Q of the main scanning valid period signal R0VENABLE.

One line of image data consists of main scanning effective section signals P and V.
It is read in the interval from the 27th point of ENABLE to the Q' point,
Positional movements in the main scanning direction of p-p' and Q-Q' are performed.

@18 Figure shows a configuration example of a scaling circuit that performs scaling in the main scanning direction. Here, 405 and 40B are the synchronous memory 14.
2 is an address counter that gives an address to 405
In step 408, the write address is counted, and in step 408, the read address is counted as the pixel transfer clock Vlll:LK, or this clock is thinned out as the clock Gka.

408 is a binary rate multiplier (Binary rate multiplier) to B-R- which generates this thinning clock Cka.
lier), and as shown in FIG. 17, the set signal 5
The input clock VCLK is thinned out at the ratio set by ET8.1 For example, the set signal B SET8 is bit (
2' = 258), then the output frequency fout is the following formula (%) with respect to the input frequency fin.
In the example in Figure 7, it is set to 192, so rou
Thinned to 3/4 fin.

This thinning clock Cka and input clock VGLK(G
kb) for each address counter 405 and 4011
Scaling is performed by inputting the signal to the clock generation selector 407 of No. 1. By selecting each of the clocks Cka and Ckb in the combination shown in FIG. 18, desired magnification can be achieved. Furthermore, if the value X of the set signal 5ET8 is changed steplessly, it goes without saying that stepless scaling can be performed.

[Effects] As explained above, according to the present invention, a document image located at an arbitrary specified position on the document table is outputted to an arbitrary specified position on transfer paper, so that editing work for color images is not necessary. etc. can be obtained easily.

[Brief explanation of drawings]

FIG. 1 is an internal configuration diagram showing an example of a digital color image processing system to which the present invention is applied. FIG. 2(A) is a layout configuration diagram showing an example of the same-magnification color separation line sensor in the document scanning unit of FIG. Third
Figure (A) is a block diagram showing an example of the configuration of a color image reading circuit. Figure 3 (B) is a timing chart showing the signal waveform of the circuit, Figure 4 is a block diagram showing an example of the configuration of a circuit that corrects and synchronizes color image signals, and Figure 5 is the printer section 0 of Figure 1. FIG. 3 is a perspective view showing main parts in detail. 6(A) and 6(B) are operation diagrams of the system of FIG. 1. Fig. 7 is a characteristic diagram showing temporal variations in the sensor output, Fig. 8 is a layout diagram showing an example of the configuration of the synchronous memory shown in Fig. 4, and Fig. 9 (A) is a start delay of the scanning unit shown in Fig. 1. 9(B) is a timing chart showing the signal waveform of FIG. 9(A). FIG. 1O is a circuit diagram showing an example of the circuit configuration. FIG. An explanatory diagram showing an example of printing out at a position. FIG. 11(A) is a mode diagram showing an example of the operation of the present system in FIG. 10 during equal-magnification control, FIG. 11(B) is a timing chart showing the output timing in the usage mode shown in FIG. 11(A), FIG. 11(C) is a mode diagram showing an example of magnification control;
Figure 2 is a circuit diagram showing an example of the configuration of a circuit that controls the scanning position movement of the league and printer related to Figures 10 and 11, Figure 13 is a timing chart showing the output waveform of the circuit in Figure 12, and Figure 14. is a circuit diagram showing an example of a control diagram for controlling the position movement of the device in FIG. 1 in the main scanning direction, FIG. 15 is a timing chart showing the timing of the signals in FIG. FIG. 2 is a block diagram illustrating an example of a scaling circuit that performs scaling in the main scanning direction. 17 is a signal waveform diagram showing an example of the signal waveform of FIG. 18, and FIG. 18 is an explanatory diagram showing the contents of the selector signal of FIG. 16. l...Color league (digital image reading device) 1.2
...Color printer (digital image printing), 3...Manuscript. 4... Original scanning unit, 6, lot, 105... Same-magnification color separation line sensor (color image sensor), 11... Scanner, 15... Photosensitive drum, 16... Transfer drum, 18 ...Actuator plate, 20...Position sensor, 21...Actuator, 22-1.22-2...Position sensor, 26...
・Developer unit. 29... Transfer: 12 Electric appliance, 30Y, 308, 300, 308K... Toner hopper, 31Y, 31M, 31G, 318K... Developing sleeve, 51... Gripper, 54... Paper sheet, 142 ...Synchronous memory, 151...Counter. 152...Preset switch, 400... Original platen, 401... Image area, 403... Transfer paper, 404... Printout designated position, 405.408
...Address counter, 40? ...Selector, 408...B-RΦM (binary multiplier), 420.43
0,440...Delay circuit, 450...Main scanning effective period signal generation circuit for original reading, 460... Main scanning effective period signal generation circuit for printing position. Figure 5 Figure 6 (B) L-------+---J Figure 7-1-IP--1---------Rosal 0TQP
・Collection Y Exit Figure 14

Claims (1)

[Scope of Claims] 1) Color image reading means for reading a document image on a document table for each color component and outputting color image data digitized for each pixel for each color, and each single color according to the image data. and a color image forming means for forming a full-color image on a recording medium by sequentially superimposing images, a first color image forming means for specifying a reading area of a document image on the document table;
a second specifying means for specifying an image recording position on the recording medium; a document image in the reading area specified by the first specifying means is specified by the second specifying means; and an image output control means for outputting an image to an image recording position on the recording medium. 2) In the system according to claim 1, the image output control means controls the movement amount in the main scanning direction and the sub-scanning direction according to the specified amount specified by the first and second specifying means. setting means for setting; a first counting means for determining the movement amount in the main scanning direction by counting pixel transfer clocks; and a second counting means for determining the movement amount in the sub-scanning direction by counting horizontal synchronization signals. a counting means; a first delaying means for delaying the start of exposure scanning in response to the outputs of the first and second counting means; a first delaying means for delaying the start of image formation in response to the outputs of the first and second counting means; A color image processing system comprising: second delay means.