JPS6054569A - Color image recording device - Google Patents

Abstract

PURPOSE:To obtain a colored positive copied image of high quality which does no show any unevenness even though it is magnified, by performing a shading correction in accordance with the distribution of the intensity of illumination of illuminated light when the optical image of a transparent color original is read and image processing is performed by projecting the original under a magnified condition. CONSTITUTION:The optical image W of an original projected under an magnified condition is given to a blue, green, and red photoelectric converters 17, 18, and 19, where the image W is converted into electric signals, through an optical system and the electric signals are supplied to an image processing means C. The means C is composed of a shading correction circuit 54 which corrects each signal in accordance with the characteristics of the light source, namely, with the distribution of the intensity of illumination, gamma-correction circuit 55 which performs logarithmic conversion on each signal, masking process circuit 56, UCR circuit 57 which makes image reproduction by means of black tonner by extracting black components, dither processing circuit 58, and multivaluing process circuit 59. At the shading correction circuit 54 correction of inputted digital image signals is made by comparing them with the characteristics of the light source stored in an ROM.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a digital color image recording apparatus that can obtain a high quality color positive copy image from a negative or positive transparent color original.

[Prior art]

Various color photocopying apparatuses have been considered as devices for obtaining color positive copy images from negative or positive transparent color originals. There is a problem in that uneven image skipping is likely to occur, making it impossible to obtain a high-quality, practical copy image. Furthermore, there was no device capable of copying negative, positive, and reflective color originals, which was extremely inconvenient.

[Purpose of the invention]

This invention was made in view of the above-mentioned problems, and is a novel method that can easily obtain a color positive copy image of higher quality than a negative or positive transparent color original, and can also obtain a copy image of a reflective color original. The purpose is to provide a multifunctional color image recording device.

Another object of the present invention is that even if there is uneven illuminance in the projection light of a slide projector that projects a negative or positive transparent color original, the copied image will have good image quality without unevenness or skipping. The purpose is to provide a device that can be obtained.

A further object of the present invention is to perform optimal gamma correction and masking when copying negative film (usually g/f is about 0.6), positive film (usually gamma is about 1.2), and reflective originals. By providing a plurality of image processing data that can be switched depending on the original to perform image processing such as processing and dithering, the copied image will have a gamma of approximately 1.0 and no color clouding, regardless of the original. ,
Another object of the present invention is to provide a device with excellent gradation.

Still another object of the present invention is to provide an apparatus that improves the image quality by providing a white frame around a copied image of a transparent color original.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 15.

FIG. 1 is a diagram showing an outline of the present invention, and FIG. 2 is a sectional view of an imaging device for reading document information according to the present invention.

In the figure, 1 is a document glass, 2 is a Fresnel lens placed on the top surface of the document glass 1, 3 is a slide projector as an enlarged projection means, and a film fixing frame (
The projector is arranged so as to project a transparent color original 4 such as a transparent color negative film or a color slide film (not shown) fixed to a substrate (not shown). 5 is a reflecting mirror provided on the slide projector 3, 6 is a light source, 7 is a condenser lens for condensing the light emitted from the light source 6, and 8 is for projecting the light condensed by the condenser lens 7. The projection lens 9 is a mirror disposed opposite to the projection lens 8 and has an appropriate inclination angle so as to reflect the light passing through the projection lens 8 downward. 10 is a light source for irradiation in the case of the reflective color original, 11, 12, and 13 are first to third mirrors for reflection, and 14 is a near-infrared light cut filter for image pickup. shi/zu 1
It is placed in front of 5. Reference numeral 16 denotes a three-color prism disposed behind the imaging lens 15, which performs color separation of Bl, Gl, and red.

Reference numeral 19 denotes a charge-coupled device (hereinafter referred to as CCD) as an imaging means for reading each of the blue, green, and red color separation images.

FIG. 3 is a partially enlarged cross-sectional view of the vicinity of the three-color separation prism 16, in which each prism has an angle of 20.21°22.
The light from the slide projector 3 forms each optical image B,
It shows how it is decomposed into G and H.

Log/lamp 10 and first mirror 11 shown in FIG.
1 constitutes the scanning unit U, and is supported by a support (not shown), moves in the Y direction in the figure along a guide rail (not shown), and is projected onto the original platen glass 1. It is arranged so that it can be scanned. Also, the second and third
The mirrors 12 and 13 are integrally supported by a support (not shown) and are configured to move in the Y direction in the figure along guide rails (not shown); The moving speed of I. Roge/U/F is as follows.

10 and the first mirror 11 are moved to the positions indicated by the dashed-dotted lines in the figure, the optical path length up to the imaging point 15 is maintained at a constant value for any scanning point on the platen glass 1. I'll do it.

FIG. 4 shows the illuminance distribution on the Frenet I-relens 12 when the document table projects the illumination light from the light source 6 of the slide projector 3 shown in FIG. 2 onto the lath 1 without passing through the transparent color document 4. , which simulates the illuminance distribution in the form of contour lines. Generally, when a commercially available slide projector is used, it tends to exhibit the above-mentioned illuminance distribution.

Q and -Q indicate the first to fifth striped patterns, respectively.

FIG. 5 shows the relationship between the distance D (im) from the illumination center on the VC Fresnel V lens 12 and the illumination g s (JuX).

As shown in the figure, the illuminance ratio between the center of illumination and the edges is about 1:0.5 to 1:0.3, and the slide projector
When the copied image of the transparent color original 4 is trimmed by using the projection lens 8 of 3 as a zoom lens, the illuminance ratio at the center of the contour line shape showing the illuminance distribution shown in FIG. changes.

FIG. 6 shows a color laser beam printer that outputs all the image information read by the image pickup device shown in FIG. 2 that reads the document information.

In the figure, 23 is a semiconductor laser as a recording means for emitting laser light Lae, and the CCD 1 shown in FIG.
It is modulated by a signal based on the signals obtained by 7 to 19. 24 is a beam expander/der that makes the modulated laser beam La a predetermined diameter, and 25 is a polyhedral reflector that reflects the laser beam La that has passed through the beam expander/der 24.

26 is a constant speed rotating motor for rotating the polyhedral reflecting mirror 25 to substantially horizontally scan the laser beam La; 27 is an imaging lens having f-0 characteristics; 28 is the imaging lens 27; Laser light Laf passed through: A slit for passing the laser light Laf, which is provided in the secondary charger 34, which will be described later. 29 is a photosensitive drum that forms an image of the V-zer light La that has passed through the slit 28 as a spot light. 30 is disposed near the photosensitive drum 29 and includes the imaging lens 2T.
A mirror that partially reflects the gold of the laser beam La that has passed through the mirror, 3
1 is a laser beam detector that detects the laser beam La reflected by the mirror 30;
A control signal is extracted so that the semiconductor laser 23 is modulated at an appropriate timing to provide a predetermined optical information to the semiconductor laser 23.

The photosensitive drum 29 includes, for example, a CdS photosensitive member made of three layers: a conductive material, a photoconductive layer, and an insulating layer, and is supported by a support (not shown) so as to be able to rotate once.

32 is a cleaning unit provided near the photosensitive drum 29; 33 is a cleaning unit provided near the photosensitive drum 29;
9 is an fc primary charger, 34 is a secondary charger, and 35 is a lamp that uniformly exposes the photosensitive drum 29 to form an electrostatic latent image. are arranged opposite to each other. 36, 3γ, 38
are developing devices having yellow, maze/yellow, and cyan developers, respectively, and are arranged below and adjacent to the photosensitive drum 29.

39 is a paper feeding cassette, 40 is an nfC transfer material stored in the paper feeding cassette 39, 41 is a paper feeding roller, 42 is a transfer drum having the same diameter as the photosensitive drum 29, and 43 is a transfer material for the transfer drum 42. A gripper is provided to hold the leading end of the transfer material 40, 44 is a cylinder notch formed in the transfer drum 43, and 45 is a gripper 70 extending over the cylinder notch 44.
A polyester mesh screen with a mesh size of around 7 units.
This allows the transfer material 40 to be wrapped around it. 46
charges the back side of the transfer material 42 through the opening of the mesh screen 45 and charges the mesh screen 4
5 is a transfer charger that charges the photosensitive drum 29 to transfer the image developed on the photosensitive drum 29 onto a transfer material 40, and also causes the transfer material 40 to be electrostatically attracted to the mesh screen 45. 47 is a separation claw for separating the transfer material 42 from the transfer drum 42; 48 is a conveyance belt for conveying the separated transfer material 40; 49 is a heating device for heating the transfer material 40 conveyed by the conveyance belt 48; A heating roller fixing device 50 for fixing is a paper discharge tray, and is provided for fixing the transfer material 40 that has passed through the entire heating roller fixing device 49.

Next, the image processing section as the image processing means C of this apparatus and its surroundings will be explained with reference to FIG.

In the figure, 51, 52, and 53 are respectively the aforementioned CCD 17
．． 18.19f: A CCD driver for driving, which photoelectrically converts blue (B color), green (G color), and red (R color) optical images. 54 is the CCD17.18
．． 55 is a shading correction circuit for correcting each signal converted into an electric signal by 19 according to the characteristics of the light source, that is, the illuminance distribution; 55 is a γ (gamma) correction circuit for logarithmically converting the shading-corrected color signal; 56 57 is a masking processing circuit for performing color correction, and 57 is a U for extracting the black component of each color and reproducing the image with black toner.
58 is a CR circuit, and 60 is a multi-value processing circuit for time-divisionally performing luminance modulation for one spot of the V-zer beam using a signal based on data obtained by converting the density data obtained from the previous stage into area density. An inversion control circuit that inverts the output from the multi-value processing circuit 59 in response to a signal from the main body control section which will be described later; 61 is a laser driver for driving the semiconductor laser 23; 62 is the CCD driver 51, 52, 53; and shading correction circuit 54, γ correction circuit 55, masking processing circuit 56, UC
R circuit 57, dither processing circuit 58, multi-value processing circuit 59
63 is a main body control section that controls each part, and 64 is an area detection circuit for detecting a point area of the optical image W.

FIG. 8 shows details of the shading correction circuit 54.

In the figure, 65 is the CCD driver 5 for the R signal.
a latch that holds the digital image signal output from 3;
66 is a RAM for storing the data held in the latch 65; 67 is the correction data stored in the RAM 66, a so-called shading correction ROM; and 68 is the synchronization control circuit 62 which receives the synchronization signal and stores the above-mentioned LRAM 55.
chip select (CS) signal, address (ADI(
, ES) signal and write enable (WENABI
) is a read/write counter that supplies the signal. Na2
, SH, and RH are synchronization signals.

FIG. 9 shows time sorting by the shading correction circuit 54.

In the figure, 2φt is a carrier wave, B-1) is a beam detector signal, and SP is a sampling timing da pal that is generated from the carrier wave 2φt and the beam detector signal B-D and has a period four times that of the carrier wave 2φt. , This sampling timing pulse (SP) causes the main body control unit 63 to output VDgNABLh: and l(, AMWI
-LIT'E signal is the output signal. A D u E S
uADk V D E N A B L B toe synchronizing signal, AM W) LITE is a control signal for writing the digital image data held in the latch 6"L, - to the RAM 66. Said Vl) h: NABLE The signal consists of a shading correction scan section S of the 几AM W 几1'lE signal, a portion S2 and a seven scan section S3 synchronized with the shading correction scan section S.

FIG. 10 is a diagram showing details of the area detection circuit 64, and 69 is an 8-bit signal that is activated when the 1-pit digital signal from the multi-value processing circuit 59 (FIG. 7) has 8 consecutive periods. The white detection circuit 70 is a main scanning counter that receives the carrier wave signal 2φt and counts the number of scans, and its clear (CL) terminal KVD ENABLEli17'c
When ij:B-J]l is input, the count value is cleared. 71 is a latch that holds the count value of the main scanning counter 70 together with the signal sent out in conjunction with the operation of the 8-pit white detection circuit 69; 12 is a comparator provided on the main scanning color/counter 70 side; 73 is a latch provided on the side of the main scanning counter 70, and 74 is a latch provided on the side of the main scanning counter 70.
A latch 75 that holds the 8-bit white detection signal from the pit white detection circuit 69 is input to the previous geVD ENABI, W (i number 177 (CL) terminal, the count value is cleared, and the HD signal is counted. Sub-scan color/re, γ
6 is the count value of the sub-scanning counter 15 and the latch 82
77U is a comparator which clears the main scanning color/reference signal 70 based on the VD 1uNABLhi signal or the BD double signal; 78 is a comparator; , the count value of the main scanning color/reference 70 and the data of the latch 11 are compared, and the larger one is output. 79 is a latch for holding the output of the comparator 7B=υ; 80 is a comparator that compares the data of the latch T4 and the data of the latch 81, which will be described later; 81 is cleared by the VD ENABLh: signal and the BD times signal; A latch 82 holds the output of the comparator 80 and a latch 82 holds the output of the comparator T6 and the output of the selector 83 at the previous stage.
4 is a selector on the sub-scanning side, and 77a and 77b are 7tOR circuits arranged on the main-scanning and sub-scanning sides, respectively.

Note that Xm1n is the output of the latch 73, and Ym i n
is the output of the latch 82, Xmax is the output of the latch 79, and Yniax is the output of the latch 81, which are stored in the microcomputer.

FIG. 11 is a detailed diagram of the inversion control circuit 60 shown in FIG. 7.

In the figure, 85 to 88 are data stored in the microcomputer, Xmax, Xm1n, Ymax, Ymin.
A comparator 89 to which are inputted respectively outputs the area corresponding to the black part of the optical image W as a high level υ based on the values of the main scanning and sub-scanning counters output from the area detection circuit 64 (FIG. 10). Do' (NAND)
A circuit 90 receives an output signal from the N, A N D circuit 89, and is gated by an area erase signal from the microcomputer. A circuit 91 whitens the image signal only when the output of the AND circuit 90 is at a high level. 92 is an EX-O circuit for inverting the output of the OR circuit 91 according to a control signal from the main body control section 63 to read an inverted image;
This is an R circuit.

Figures 12(a) and lb) are flowcharts showing the flow of the control program stored in the microcomputer, where F is the step for determining whether or not automatic dot spot erasing is to be performed, and F2 is a standby step in the case of automatic dot spot erasing. The area detection circuit 64 (FIG. 10) cr) X
, Ymin, max data is stored, F3 is a step of determining whether it is a position specification in the case of manual, F is a step of storing position data, F,
is the step of memorizing the position data of the maximum effective image area.

The same figure (BL is 70-chi?
−)'! r, G is a step for determining the start of transmitting image data, and G2 is a step for determining the start of transmitting image data;
Step G3 is a step of determining whether to transmit min and max data, and step G3 is a step of determining whether to transmit image data.

Further, FIG. 13 shows a mask M used to frame a reflective color original.

Most of the light emitted from the light source 6 of the slide projector 3 shown in FIG. through the projection lens 8
The light is reflected downward by the reflecting mirror 9, passes through the Fresnel lens 2, and is projected onto the document table glass 1.

On the other hand, the laser beam La emitted by the semiconductor laser 23 shown in FIG. 6 is transmitted to the CCDs 17 to 19 shown in FIG.
The image signal is read by the image processing apparatus shown in FIG. 7, and is modulated by a signal formed into one series of image signals corresponding to one main scanning line/line. Then, the modulated laser beam La becomes a laser beam La having a predetermined beam diameter in the beam expander 24 and is incident on the polyhedral reflecting mirror 25. When the plurality of reflecting mirrors of the polyhedral reflecting mirror 25 are rotated at a constant speed υi by the constant speed rotating motor 26, the incident laser beam La is scanned substantially horizontally. The second order band  @ device 34
The light passes through the slit 28 and forms an image on the photosensitive drum 29 as a spot light.

Further, a part of the laser beam La that has passed through the image forming lens 27 is reflected by a mirror 30 and detected by a laser beam detector 31, and predetermined optical information is transmitted onto the photosensitive drum 29 based on the detected signal. The timing of the swing operation of the semiconductor laser 23 is controlled. The photosensitive drum 29
has been cleaned in advance by the cleaning unit 32, and then the influence of the previously formed 7 symbol is removed by the AC charger, and as the photosensitive drum 290 rotates in the direction of the arrow in the figure, the surface of the photosensitive drum 290 is firstly cleaned. After being uniformly charged to a positive polarity by the charger 33, a corona discharge of negative polarity is applied by the secondary charger 34, and the laser beam La
The electrostatic latent image is scanned by the image forming apparatus 35, and then uniformly exposed by the imager 35 to form an electrostatic latent image. This latent image is represented by a developer 36.with yellow, maze/red and cyan developer, respectively.
Developed by the corresponding color developer among 37 and 38. Then, the transfer material 42 stored in the cassette 39 in advance is transferred to the paper feed roller 41 in synchronization with the rotation of the photosensitive drum 29.
The leading edge of the transfer material 40 is held by the gripper 43 of the transfer drum 42 and wound around the optical surface of the mesh screen 45 in the sill cutout 44 thereof. The transfer charger 46 charges the back side of the transfer material 40 through the opening of the mesh screen 45, charges the back surface of the mesh screen/45, and transfers the developed image on the photosensitive drum 29 to the transfer material 40. Metshusuf'
)-745, the transfer material 40 is electrostatically attracted to the surface.

Then, the photosensitive drum 2 is placed on the transfer material 40 on the transfer drum 42.
After the three colors of the developed image on 9 are aligned and multi-transferred, the gripper 43 is released and the separating claw 47
is operated to separate the transfer material 40. Then, the transfer material 40 is guided to a heating roller fixing device 49 by a conveyor beset 48, the transferred image is heated and fixed, and then the transfer material 40
is discharged onto the paper discharge tray 50.

The above-mentioned modulation of the laser beam La is performed based on data obtained by image processing as described below.

First, regarding the shading correction circuit shown in FIG.
To explain mainly the processing of color signals, C for R signal.
The latch 65 of the signal sound shading correction circuit 54 output from the OD driver 53 holds it as a digital image (hereinafter referred to as data), and the data is
Enter into 5. Then, from the read/write counter 68, IM]gself1-LAM56 address (AD) LE8
) and write enable* (WENABLg) signals are supplied, and at this time, a synchronization signal is issued from the synchronization control circuit 62 to the read/write color/receiver 68. on the other hand,
The VD ENABLE and l (AMWRITE) signals that control the read/write of the read/write counter 68 are supplied from the main body control unit '63, and the shading correction value (hereinafter referred to as correction data) is sent from the AM55 to the shading correction ROM 5γ to perform shading correction. will be carried out.

At this time, the main body control section 63 performs a preliminary scan as described above, sets a calibration film for only the base density without an image on the transparent color original 4, and controls the main body tli at the timing of the preliminary scan. fJ63 j
II) Vl) FJN'ABI, g o f? , I.A.
Once the ITE signal is output, it passes through the write counter 68 and selects the chip of the RAM 66 (C8).
and the write enable (wE) terminal.
B6 can be pumped in (Fig. 9 Tb) of
:L, read/write counter 68 is VD ENAB
Li4 and 2φt, from the BD signal, make a full tie, a ngvalus (SP) i. That timing (sp
), as shown in FIG. 9 (al), a pulse 7 is generated which is output every 4 counts for the BD signal and every 4 counts for the 2φt 1a.
1) Create a timing signal (SP) with a period four times 2φt in the first period of the signal, and make it 2 or 3 times the HD signal period.
1114<The fourth signal outputs the same signal as the first signal.

In this way, one pulse for every four pulses is output in the main scanning direction, and one pulse for every four pulses is output in the sub-scanning direction, and the output pulse signal causes the latch 65 to be output.
holds the image data of the calibration film. Then, the image data is written into AM66 by an address counter synchronized with the sample pulse (SP). In this way, correction data for calibrating the entire screen is obtained.

Here, during the main scan, the VD gN is sent from the main body control unit 63.
The AHLE signal passes through the read/write counter 68 and is also
When output to the chip select (C8) terminal of M55, it becomes 1.
．． The LAM 66 becomes readable, and the read/write counter 68 outputs the address signal 'fe'AfV156 in synchronization with the Vl)ENABLE signal. At this time, when reading the data stored in the RAM 66, the read/write counter 68 outputs the same address signal for one sampling signal (SP), and the HD double signal 1, 2, and 3 pulses both output the same address. (FIG. 9(C)) The data output from the AM56 at the above timing is input to the address of the shading correction ratio 0M60, and the table reference data in the shading correction ROM 57 is output together with the image data to perform shading correction. It becomes image data.

The image data subjected to the shading correction as described above passes through the γ correction circuit 55, the masking processing circuit 56, the UC■ processing circuit 57, and the dither processing circuit 58, and then the multi-value processing circuit 61 and the inversion side fI11 circuit 60. Supplied. Then, if a black part is blank in a certain area of the image data, the black part is changed to white by the inversion side output circuit 60, and the negative is inverted to positive over the entire area.

Here, for example, the area exclusion signal is pressed using the I10 key (not shown).
, a preliminary scan is performed once during the 190-line scan of the CCD, and during the preliminary scan, a black signal is sent from the UCI circuit 57 and a 1-bit digital signal is passed through the dither processing and multilevel processing circuit 59. is input to the area detection circuit 64, and since the area detection circuit 64 is configured as shown in FIG. 10 as described above, the white signal is 8.
If the bits are continuous, the main scanning and sub-scanning atomes are held and a signal is sent to the main body control section 63. Then, for example, the multi-value processing circuit 59 continuously outputs 8 1-bit digital signals.
If the cycle is white, a detection signal is sent from the 8-pit white detection circuit 69 of the area detection circuit 64, and the main scanning color 0 and sub-scanning color 75 are connected to the latch 71.
and held by 74.

Here, in the case of main scanning, the latch 71
The count value held in is sent to the selector 83, but at this time, the Vl)lABLFl
When the i or Bl) signal is input as a low level to the S terminal of the selector 83, the count value of the main scanning color/reverse 72 is selected and output from the Y terminal to the latch 73 at the subsequent stage. When a high level is input to the select switching terminal S of the selector 83 by the BD double signal at the leading edge of the image, the power supply voltage is selected from the S terminal and output from the Y terminal of t to the latch 73, while the OR circuit Since the BD multiplied signal is input to the clock terminal GK of the latch 73 via the clock terminal GK of the latch 77ak, the maximum value is held by the latch 73 as a high level value, that is, a count value.

And; the count value of the main scanning counter 70 is the latch 71
It is sent to the comparator 72 and compared with the data of all 1s, that is, the data of the latch 73 that latched the maximum value, and the smaller one is held in the latch 73 and output
On the other hand, Xmax is obtained by comparing the count values of the main scanning color/reference 70 by a comparator 78, and the larger one is held by the latch 19. Similar operation is performed on the sub-scanning side. Ymin +Ym
The output of ax, that is, the maximum value and minimum value, is output to each latch 81.
．． 82. Then, the microcomputer stores the data latched in each latch 73, 79, 81, and 82 as described above.The stored fcm data is the main scan B, G, and R signals. (See Fig. 11) Here, since the inversion control circuit 60 is configured as shown in Fig. 11, the data stored in the microcomputer is input to the comparator. According to the values of the main scanning and sub-scanning counters 70.75 output from the area detection circuit 64, the area corresponding to the black level becomes a high level and is output from the NAND circuit 89. The AND circuit 90 is gated by the control signal of the microcontroller, that is, the signal indicating whether to erase the area, and its output is input to the zero circuit 91. For example, if the image signal is small, The black part becomes white, and the other parts remain unchanged.

Then, the image signal in which the black part becomes white is EX-OR
When the control signal (EX-0) is input to the circuit 92 and the control signal becomes high level by the circuit 92 acting on the control signal of the microcomputer, the white part of the input image signal does not change, but it becomes low. When the level is reached, the white part becomes low level, that is, black, and the black part becomes high level, that is, white, and the image signal is inverted.

Also, to erase black spots, the image read by the microcomputer from the I10 key is stored in 1ill11-1t (A, and when the image signal is output, Xmax, Xmin of the inversion control circuit 60 is
.

By outputting data to each port of Ymax and Ymin, only black lines are erased. To explain this based on the flowchart of the sub search/ in Figure 12, step Fυ is used to determine whether the automatic dot eraser is to be erased using the I10 key, and if it is automatic dot eraser, a preliminary scan L- is performed. .

Step F2) to store the X, Ymin, and max data of the area detection circuit 64; step F3) to determine whether the position is designated in manual mode; step F4) to store the position data; and step F4) to store the position data. If so, store the data of the maximum effective area in memory. Then, for example,
m1n=O, Ymin=OXmax=4572°Yma
If you enter x=6720 f, the A316 pel image will be copied without black spots.

This configuration has the following effects.

(1) As shown in FIG. 9(a), (bl, (C1), the above-mentioned shading correction
1 pulse per pulse, 1 per 4 pulses in the sub-scanning direction
Since one pulse is written to RAM 135 by a counter synchronized with the sample pulse and becomes correction data,
Since shading correction is performed on a 4 x 4 matrix using the same correction data, it is possible to compress the memory cost in units of 4 x 4 matrices and reduce the memory cost to 1/16.For example, at 16 pe/ 279x410 A
Although the plate correction data is enormous at 12 megabytes, it can be compressed to 1/16 as described above, making it easy to reduce costs.

(2) Similar to +1), from the viewpoint of performance and cost, by changing the sample timing pulse (SP), it is possible to further compress the data and significantly reduce the memory cost.

(3) When projecting the optical image W of the transparent color document 40 onto the document glass 1, a white frame can be easily created around the copied image by placing a mask M shown in FIG. 14 on the document glass 1. Since it is possible to form a copy image, it is possible to significantly improve the quality of the copied image.

(4) The image processing means C includes a gamma correction circuit 55,
Since it is constituted by a masking processing circuit 56, a dither processing circuit 58, etc., by providing data that can be switched according to the original 4, optimal gamma correction can be performed for each of negative film originals, positive film originals, and reflective originals when copying. No matter which of the above originals is used, the gamma of the copied image is approximately 1.0, and the color density of the copied image is significantly reduced.

Further, it is possible to obtain a good image with excellent gradation.

(5) Further, since the shading correction circuit 54 performs correction based on the correction value that matches the illuminance distribution of the slide projector 3, even if the projection light of the slide projector 3 has uneven illuminance, This has the effect of producing high-quality copied images without unevenness or image skipping.

[Other Examples]

Other embodiments of the invention will be described below with reference to FIGS. 14 and 15.

FIG. 14 shows a 7A/D correction circuit as another embodiment.

In the figure, 93 is a linear image sensor such as a CCD for reading an image, 94 is an A/D converter for analog/digital conversion of the output of the CCD 93, and 95 is a control circuit for generating a timing signal for the CCD 93. A latch 95a holds data output from the A/D converter 94, and a latch 96 stores data for shading correction of the horizontal scan.
I RAM 91 is a read 2 counter for controlling the address of the front S-HRAM 95, 98 is a latch for holding data output from the IL/D converter 94, and 99 is a latch in the sub (vertical) scanning direction. A sub-scanning synchronization circuit generates timing to latch data; 100 is a VRAM that stores data for performing shading correction in the sub-scanning direction; 101 is a read/write color/column for controlling the address of the VRAM 100;
% 102 is ROM for shading correction, 103
1, H) (Microcomputer I10 board for controlling the kLAM9s and vRAM100e; 104 is a CPU that sends control signals to each section to perform control; and 106 is a latch.

Note that O8 indicates a signal line for an analog signal (As) sent from the CCD 93 to the A/D converter 94. Also,
φ person, φB is the basic transfer wave (see Figure 15), 105i1
For JL (DCCI) Tiger (bar, VH9 ratio H is a synchronization signal.

The CCD 93 that has read the image outputs an analog signal (AS) from the signal line O8, and the basic transfer wave φA.

By φB, the analog signal (AS) is alternately
The A/D is synchronized with the carrier wave 2φt shown in FIG. 1at.
The image is sent to the converter 94, but in this case as well, a white calibration film is set in advance and a shading correction scan is performed as described above. The timing/gu at this time was 15th.
The sub-scanning synchronization circuit 99 generates synchronization with the V it times signal shown in FIG. 1a). Then, when the chip select signal C8 and the write enable signal (WE) of the VRAM 100 are applied during the shading correction scan, a signal (B
D) After counting k, the read/write register 101 operates, and the data held in the latch 98 is written to Vl (AMloo) once for each horizontal synchronizing signal (B, 1).

As described above, one piece of data in the sub-scanning direction is stored in the VRAM 100 for each synchronizing signal.

On the other hand, shading correction is performed by the microcomputer I during the main scan.
10, the HR shown in FIG. 15 (bl) is stored in the HRAM96.
At the same time as the AMC8 signal is applied, an address signal synchronized with the beam detector signal BD and carrier wave signal 2φt is sent from the read/write counter 97 to the HRAM96.
supplied to

Then, horizontal white data is supplied to the address of the ROM 102 in synchronization with the address signal.

On the other hand, the microcomputer I10 supplies the VD ENABLE signal shown in FIG. 15 (bl) to the chip select terminal C8 of the VRAMI QQ, and the address of the VRAM 100 is sent from the read/write color/pioi to the VD ENABLE signal shown in FIG. 15 (1a).
) Vt-t signal as a basic clock, a signal is supplied that prevents the count number from changing during the BD double signal detection period, and the same f-time signal VB, AM 1 is supplied during the detection period.
001 l) ROMI 02 Noah Torres is supplied.

In this way, the shape ink correction data is R,0M
The shading correction data and non-scan document data are supplied to address 102 (,0M10).
The document data is supplied to the address No. 2, and the document data is converted according to the shading correction address in a manner referred to in the table of the above-mentioned 0M102.

When the white correction data is the largest, the data obtained by multiplying the original data by a small coefficient is stored in the 0M102, and when the correction data indicates the minimum value, the data obtained by multiplying the document data by a large coefficient is stored. If the central part and peripheral part of the document have the same density, it is considered the same data, approximately 0d102.
The correction data is output as shading correction data in the main scanning and sub-scanning directions.

This configuration has the effect of requiring less memory than the previous embodiment. Especially 279X410
Even if all pixels are stored, the total of H)l, AM and Vl(AM) is IIK bytes.

In the above embodiment, the CCD driver 10 for eight colors is
Although only 5 has been explained, it goes without saying that the CCD driver for B color and the CCD driver for 0 color each have independent shading correction circuits, and shading correction data corresponding to each of the above three colors is provided. is then supplied to the r correction circuit 55. (Fig. 7) Furthermore, during the shading correction, the projection of illumination light through the calibration film and the scanning of the optical system for shading correction may all be performed by a manual selection switch, but sequence control may also be used. It can be automated.

〔Effect of the invention〕

As explained above, according to the present invention, a transparent color original is enlarged and projected by the enlargement projection means, an optical image of the original is read by the imaging means, and the read image data is processed by the image processing means. In addition, the image processing means is provided with a shading correction circuit to perform shading correction according to the illuminance distribution of the illumination light from the enlarged projection means. To provide an extremely novel function and effect in that a color positive copy image with uniform high image quality and good appearance can be easily obtained even when enlarged from an original, and a copy image of a reflective color original can also be clearly obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of the present invention, FIG. 2 is an explanatory diagram showing the relationship between the distance from the center of illuminance and illuminance on the Fresnel lens according to the present invention, and FIG. 6 is a perspective view of the recording section Vi. FIG. 7 is an image processing circuit diagram showing the main part of this invention;
The figure shows a shading correction circuit diagram showing the main part of this invention.
9(a), (bl, and (c) are the shading correction time charts of FIG. 8, FIG. 10 is a region and detection circuit diagram according to the present invention, and FIG. 11 is an inversion control circuit diagram according to the present invention. 12(a) and 12(b) are flowcharts of the program stored in the microcomputer according to the present invention, FIG. 13 is a front view of the mask according to the present invention, and FIG. fJ14 shows another embodiment of the present invention. Shading correction circuit diagram. Fig. 15 (al, (bl is the time chart of Fig. 14. ...... Image processing means 23 ... Recording means 54 ... Sheating correction circuit 56 ...
・・Masking processing circuit 60 ・・・Reversing control circuit

Claims (3)

[Claims] (1) Enlargement projection means for enlarging and projecting a transparent color original;
an imaging means for reading a projected optical image of the original; an image processing means for processing image data read by the imaging means; and a recording means for recording an image based on data obtained from the image processing means. A color image recording apparatus, characterized in that the image processing means is provided with a shading correction circuit that performs shading correction with a correction value based on the illuminance distribution of the illumination light from the enlarged projection means. (2) The image processing means has an inversion control circuit capable of switching the image-processed data depending on a negative or positive transparent color original or a reflective color original. Image recording device. (3) The color image recording apparatus according to claim 1 or 2, wherein the image processing means includes a masking processing circuit for forming a white frame all around the copied image.