JPS61121665A - Picture reading device - Google Patents

Abstract

PURPOSE:To read both a reflecting original and a transmitting-type original by being provided with a reflecting exposure means, a reading means to read a picture exposed by both exposure means of the transmitting exposure means and obtain a picture signal and a correcting means to correct a picture signal by shading. CONSTITUTION:Both the negative film and the positive film are exposured by a projecting exposure means, and in the same manner as the reflecting exposure time, a reading action and a recording action are executed by the shifting of a reading sensor unit 17 and a recording head unit 18. An illuminat ing lamp electric power source 133 is constructed so that by the signal from a microcomputer 129, the voltage can be controlled and the lamp light quantity can be replaced by the negative and positive. A shading corecting circuit 60, when the shading is corrected, is composed of an RAM 137 to stored the data which reads a standard white board and a table ROM 138 to correct and exchange the shading of the video signal based upon the reading data of the white board.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an apparatus that reads an image, converts it into an electrical signal for one image, and forms an image using the image signal.

<Prior Art> Conventionally, when reading a single image, an ordinary electrophotographic copying device uses reflected light from a document, and a film scanner uses transmitted light.

Therefore, in the case of a reflective original, a normal copying machine must be used, and in the case of a transmissive original such as a film, a film scanner must be used, which is extremely inconvenient.

Purpose of the Invention In view of the above-mentioned problems, the present invention aims to provide an image reading device capable of reading both reflective originals and transmission originals.

<Embodiment> (Overview of Apparatus Mechanism) FIG. 1 is a perspective view of a digital color image forming apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a configuration diagram schematically showing FIG. 1. The present invention will be explained in detail based on FIGS. 1 and 2. An original 20 is placed on the original platen glass 1 on a flat surface.The original surface of the original 20 faces the surface of the original platen glass 1, and the original 20 is pressed by the pressure plate 1a. A reading head (hereinafter referred to as a reader) 3 that reads the original 20 is a reading sensor (hereinafter referred to as a reader) composed of a CCD array consisting of a plurality of reading elements in three rows for each of the three colors red, green, and blue (hereinafter referred to as R, G, and B). COD unit) 17 and
An exposure lamp 19 is placed thereon, and is connected to and driven by a main scanning motor 6a by a main scanning wire 8a. The sub-scanning table 5a supports one end of the main-scanning wire 8a, and supports the sub-scanning wire 10a.
is connected to and driven by the sub-scanning motor 9a.

A recording paper 21 is placed on a recording table 2, and a copy image is recorded by a recording head (hereinafter referred to as a printer) 4. Pudding 4 is yellow, magenta, cyan, black (Y, M, C
, BK) A recording element (hereinafter referred to as a BJ head unit) 18 consisting of a multi-ink jet head for four colors (hereinafter referred to as a BJ head as a bubble jet head was used in the present invention) is mounted, and a main scanning motor is connected to the main scanning wire 8b by a main scanning wire 8b. 6b
is coupled to and driven by.

The sub-scanning stand 5b supports one end of the main-scanning wire 8b, and is coupled to and driven by the sub-scanning motor 9b by the sub-scanning wire 10b.

When trying to obtain a copy image in the above configuration, the reader 3 is connected to the main scanning motor 6a via the main scanning wire 8a.
is driven to reciprocate in the main scanning direction. At this time, the exposure lamp 19 is turned on and the reading sensor 17 reads the document 20 from below and outputs image information as an electrical signal. Based on this electrical signal, the printer 4 is driven by the main scanning motor 6b via the main scanning wire 8b, and prints on the recording paper 21 while reciprocating. At this time, the main scanning direction of the reading head 3 and recording head 4 is In the embodiment, they are set in opposite directions. - After the copying process in the main scanning direction is completed and the exposure lamp 19 is turned off, the reader 3
Then, the printer 4 moves in a direction perpendicular to the main scanning direction, that is, in the sub-scanning direction, to a position where the next main scanning will be performed. At this time, the reader 3 is connected to the sub-scanning table 5a supporting the main-scanning wire 8a.
The sub-scanning motor 9 is also connected to the sub-scanning motor 9 via the sub-scanning wire 10a.
a, it moves to a predetermined position and stops. Further, the printer 4 is driven by a sub-scanning motor 9b via a sub-scanning wire 10b together with a sub-scanning table 5b supporting a main-scanning wire 8b, and moves to a predetermined position and then stops.

(Device control operation...pre-operation) Fig. 3 is a block diagram of the control circuit of the above-mentioned embodiment, and Fig. 4 is a timing chart of the entire sequence.
Figure s shows the flowchart of the program. Figure 4, 5
First, we will briefly explain the operation of the device using Figures 6 and 6.
Note that the step numbers on the timing chart and flowchart are the same.

Sequence codon roller 23, image controller 2
4 both have a microcomputer unit in the center,
Sequence control of the apparatus and timing of image data formation are programmed in each, and both microcomputers communicate data via line 39.

Let me explain the sequence from when the power is turned on.

The sequence controller 23 performs initial settings of the copying apparatus in step 1 according to the flowchart in FIG.

The printer returns to its home position for main scanning and sub-scanning.Next, in step 3, the inkjet head recovers.The head recovery operation forcibly prevents ink from sticking at the tip of the inkjet nozzle after the machine has stopped for a long time. In order to remove the ink, and furthermore to remove the liquid pool near the nozzle tip after the ink ejection operation, this operation is performed by pressing a material with good water absorption such as a porous member against the head tip or sliding it in contact with the head tip. In terms of sequence, the printer main scanning motor 6b is rotated in the backward direction, stopped by the detection output of the recovery system position sensor 22, and a drive mechanism such as a solenoid that presses the porous member against the head is turned on.
Press it against the nozzle tip for a specified period of time. After completion, the printer main scanning motor 7b is rotated in the forward direction and stopped by the detection output of the printer main scanning home position sensor 12.

Next, in step 4, the head is capped in order to prevent changes in the viscosity of the ink at the tip of the nozzle while the device is at rest until the copying operation begins. This is achieved by turning on the drive mechanisms such as If it is not a copy start, go to step 5. If it is a copy start, go to step 7 and release the head cap drive to start the copy operation.Next, go to step 8 and start the head drive prior to the copy operation. Perform dry ejection processing.Duty ejection processing is a process performed to perform stable recording, and prevents ejection unevenness at the start of ejection for image formation that occurs due to changes in the viscosity of ink remaining in the inkjet nozzle. In order to do this, the process moves to step 9, which is an operation to eject and discard the ink in the inkjet nozzle according to the programmed conditions such as the copying pause time, the temperature inside the device (temperature sensor not shown), and the copying duration time. After lighting the exposure lamp 19, shading correction processing is performed.For shading correction, before scanning the original, a standard white plate is read as a reference for the own data, and data for correcting aberrations of the optical system lens and sensitivity variations of each bit of the CCD sensor is obtained. It's about sampling.

Next, the process proceeds to step 10, and it is determined whether or not it is immediately after the start of the copy start. If it is immediately after the start of copying, that is, before the start of the first main scan, the process proceeds to step 11, and if it is the second or subsequent time, the process proceeds to step 12.

In step 11, a recovery operation of the head is performed in anticipation of a long period of suspension of the apparatus.The recovery operation in this case is the same as the operation explained in step 3.

Next, the process advances to step 12 to start main scanning.

(Refer to Figure 6 for each signal.) (Device control operation - copying) For main scanning, first, a signal is sent to the motor driver circuit 26a of the reader via line 40 to provide speed data corresponding to the magnification ratio and a rotation start signal in the forward direction of the reader. The reader main scanning motor 6a is turned on. After taking a delay time for synchronizing the reader and printer according to the magnification ratio, line 41
A rotation start signal in the forward direction of the printer is sent to the motor driver circuit 28b of the printer via the printer, thereby turning on the printer main scanning motor 6b.

Main scanning motor 6a of reader and printer.

The rotation speed of rotation speed 6b is determined by pulses (FG
The multiplied signal is compared with the rotation speed reference pulse by the motor driver circuits 26a and 26b, and is locked to a predetermined rotation speed by PLL control, resulting in a constant rotation speed. Each encoder pulse is also transmitted via lines 42, 43 to the video data synchronization signal generating circuit 28. The signal is sent to the head data synchronization signal generation circuit 38.

(Reader side processing) Next, the process advances to step 13 and a copying operation is performed. The following description will be made with reference to FIGS. 7-e and 7-b. In the video data synchronization signal generation circuit 28, as shown in FIG. Video line enable signals (hereinafter referred to as V, L, E) are generated as shown in FIGS. 6-a and 6-b. Furthermore, based on the video data start signal inputted from the COD drive circuit 29, a video data enable signal (V, D, E,) indicating the data effective width of all COD pixels and synchronized with the encoder pulse is output.
At the same time, each of the three columns on the COD unit 17 is blue (B) in the COD drive circuit 29.

A COD start signal that instructs CCDs corresponding to three colors, green (G) and red (R) to read images is supplied through line 57 in synchronization with encoder pulses. C.O.
The analog video signals for three colors read in the D unit 17 are gain-adjusted so that the sensor sensitivities of each color are equal, and then outputted through a line 44 as digital values with 8-bit depth. At this time COD
A video data start signal indicating the valid data range of all pixels is also output from the COD drive circuit 29. B, G, R3
Color digital video data (hereinafter referred to as video data) is input to a reader synchronization circuit 30.

Here, the video synchronization signal generation circuit 58 will be explained. The video synchronization signal generation circuit 28 receives the signal PHREGP line 45. from the reader registration position sensor 15.
V, L, E.

CM % is counted from line 46 and image controller 24 according to copy magnification V.

The values of L, E, and signals are input through lines 47, respectively;
After the CCD unit passes the reader registration position for image alignment, the time delay until it reaches the leading edge of the document, that is, the reading start position, is determined by counting V, L, E, and signals, and depending on the copy size. A signal video enable signal (hereinafter referred to as V, E, signal) indicating the reading width in the main scanning direction is outputted and inputted to the reader synchronization circuit 30 via line 48.

In the reader synchronization circuit 30, as shown in FIG. 6-c,
Perform alignment operation in the main scanning direction for reading the same part of a COD document corresponding to G and R colors, that is, B
, G, and R. Let LL be the interval between CODs corresponding to each color.
When the image at position S1 of the original is input to the COD corresponding to each color, there is a time lag of Ll/V, where V is the main scanning speed. Therefore, until the 31-point image is input to the R COD, which is inputted last in time, the B and G CCDs
The video data from B, G, and R3 of the image at point S1 are temporarily stored in the buffer memory in the reader synchronization circuit 30, respectively.
The color video data is output from the reader synchronization circuit 30 in its entirety. Also, V, E, 4r: after the i number is input, that is, after the original video data is input, B, G,
It outputs a video data area (V, D, A) signal indicating that the three R color video data are complete. Note that the vertical direction in FIG. 6-c is the time axis, not the sub-scanning direction.

The video data subjected to color matching processing by the reader synchronization circuit is then inputted to a scaling buffer memory 31 and subjected to scaling processing.

(Magnification Variation Process) Here, the magnification variation process will be explained using FIG. 7. The magnification processing in the main scanning direction is performed by keeping the scanning speed v1 of the printer constant and changing the scanning speed of the reader to V 1 /n (n is the magnification ratio).

This is because the upper limit of the driving frequency of the inkjet head, which is the image forming means of the printer, is lower than the upper limit of the driving frequency of the COD. Therefore, in order to increase the copying speed when copying at the same size, the maximum inkjet drive frequency is used when copying at the same size.

At this time, a variable magnification mode signal is sent from the image controller 24 to the video data synchronization signal generation circuit 28 through line 49 in FIG.

E. The frequency division ratio of the motor encoder pulse of the reader is set so that the signal has a common frequency when the magnification is the same and when the magnification is changed (Figures 7-a and 7-b).

That is, as shown in Figure 7-a, the motor encoder pulse φM
When is the same size, the frequency is divided by 1/6 as shown in φM1, and 1/2
When reducing the frequency by 2 times, divide the frequency by <1/12 as shown in ΦMl/2, when expanding by 2 times, divide the frequency by 1/3 as shown in φM2, and when increasing by 3 times, divide the frequency by 1/2 as shown in φM2. Divide the frequency. The motor encode pulse φM has the same frequency, but when it is 1/2 times the frequency, it is doubled, and when it is 2 times the frequency, it is 1/3 when it is 1/2.3 times, so φMl, φM2. The frequencies of φM3°φMl/2 are actually the same frequency.

Fig. 7-b shows the reading position on the document and the moving distance of the CCD during a certain time t (=V, L, E sections). When you reduce the size to 1/2, the distance traveled is twice that of the original size, and when you enlarge it to 2 times, the movement distance is 1/2 compared to the original size.
2 Move.

Further, the scaling process in the sub-scanning direction is performed using the video clock φ(CL
This is done by controlling the address path of the scaling buffer memory 31 when each pixel of the R, G, and B video signals sent from the reader synchronization circuit 30 is stored in the scaling buffer memory 31 in synchronization with K8). (Figure 7-c).

This is achieved by increasing or decreasing the number of clock pulses of the address counter when the i[mode signal is input from the image controller 24 through the line 50 to the memory control circuit 32 and writing to the scaling buffer memory 31 in accordance with the scaling ratio. (FIG. 7-d), thereby causing a double buffer memory 59a in the variable scaling buffer memory 31.

In the memory 59b in write mode (W) of b, data of the same pixel is written to n addresses when enlarged by n times, and 1 pixel out of n pixels is written to 1 address when reduced by l/n. When data is to be written and the read mode is entered, interpolation and thinning of pixel data will be achieved when the address is incremented by the video clock φ-CLK8.0 In this embodiment, the motor speed on the reading side The motor speed on the recording side may also be changed.

Here, using the seventh-dlffl, the scaling buffer memory 3
Another function of No. 1 will be explained. Double buffer memories 59a and 59b in the variable magnification buffer memory 31 are used for writing and reading.

Although the clock on the address sidewalk is changing.

This is the V, L, E, signal is the reader main scanning motor 6a
Since the encoder pulses are generated from encoder pulses, if uneven rotation of the motor occurs, the positional information between each main scan over the entire sub-scanning area will be accurate, but the frequency will be uneven. V, L,
In order to synchronize with the E, signal and not to cause fluctuations in the COD accumulation time, the image reading cycle by COD is set to 172 or less, which is the minimum value of the cycle of the V, L, E, signal.
The shift clock φ-CLK4 of the CD 17 is a video clock, and in order to have a frequency more than twice that of φ-CLK8, the address clock when writing a same size copy of the double buffer memories 59a and 59b is the shift clock φ-CL of the CCD 17.
K4 is used, and when reading, the video clock φ-CLK, which is a synchronization signal for pixel data in the reader and printer, is used.
8 is used.

As described above, the scaling buffer memory 31. In the variable magnification mode, the memory control circuit 32 interpolates pixel data in the sub-scanning direction;
In addition to the thinning operation, the COD accumulation time is kept constant and a pixel reading operation is performed in synchronization with the encoder pulse of the reader main scanning motor 6a.

(Image signal processing) B that has been subjected to the above scaling processing in the scaling buffer memory 31
, G, and R color video data is then sent to an image processing circuit 33.
and undergoes the processing shown in the blocks of FIG.

First, the video data of the three colors R, G, and R is corrected by the shading correction section 6° based on the data of the standard white plate read in step 9. In this embodiment, COD exposure amount light output voltage V Since the image light is read within the range where linearity is maintained, the following correction is applied.

■, -Vsmax -TiTT-V However, V! ; Output after shading correction V, CO
Output from D Vmax; Output when reading the whiteboard V S m &
The video data that has been corrected for X + set ratio shading is input to the next logarithmic conversion unit 61, where the light amount value is converted into an ink density value, and at the same time complementary color conversion is performed, resulting in B, G, and R video data. are converted into density data of "l+m*C," respectively.The conversion formula is expressed by the following equation, where D is the ink density, Ep is the standard white plate reflected light amount, and E is the image light amount.

The three color density data after conversion under E
and is input to the edge extraction section 63.

Black extraction is the secret to calculating the amount of black ink applied from the density data of the three colors Y, M, and C. This is Y, M, C3
This is because if you try to express black (hereinafter referred to as Bk) with colored ink, it is difficult to express complete black, and the amount of ink applied is large, to prevent "bleeding" and excessive expansion of the paper on the copy paper. Further, UCR (undercolor removal) is a method of reducing the amount of ink of each color Y, M, and C in relation to the amount of black ink when black ink is used by black extraction, and in this example, the following formula was calculated. .

Bk= (win (Y, M, C)-al) a2Yo
ut= (Y-a3Bk)aa Mout = (M-a5Bk)a6Cour
= (C-a, 78k) aB However, a1 to a8 are arbitrary series edge extraction involves adding the amount of edges extracted by extracting the edges and lines of the image to the original image data with a specific relationship. In this embodiment, edges were extracted using a 5×5 convolution mask in the main scanning and sub-scanning directions. In order to remove noise components from the extracted edge amount, we selected an arbitrary threshold so that low-level detection values were not added to the image data. Furthermore, the edge extraction section outputs video data valid signals (hereinafter referred to as V, D, V, and @) indicating steel rings for which edges can be extracted using a Laplacian mask while the video is enabled. This means that when using a 5×5 Teprasian mask, V,
E, V, L after the third wood after the signal becomes active
, E, indicates that the V, D, V signals are output.

The density data Y, M, and C after UCR are input to the masking section 64 and subjected to masking processing. Masking is a matrix calculation process to correct turbidity when ink is superimposed due to unnecessary absorption of ink, and the following calculations are performed.

However, &11 to a33 are arbitrary series numbers.

Next, the masked Y, M, C three colors and Bk density data are input to the output gradation correction circuit 65, and the subsequent two
Correction can be added to flatten the gradation when expressing pseudo-halftones using the dither method used in the value conversion circuit. The correction formula is shown below.

Y o u L = (asl(Y-asz))
”M out = (as+ (M −ass
) ) a56COut = (a57 (C-
a58) ) "However, a51-a59 are arbitrary series numbers.

Next, output gradation corrected density data, Y.

M, C, Bk and edge amount ED are input to the binarization section 66 and subjected to binarization processing.

In this embodiment, the binarization process first uniformly binarizes the image data using a systematic dither method, and then corrects the pixel of interest using edge data ED.
When correction is performed based on the truth table shown in Figure b, an image with blurred edges due to the systematic dithering method becomes a pseudo-halftone expression image with enhanced contours.

The video signal processed by the image processing circuit 33 as described above and converted into binary signals of four colors (Y, M, C, Bk) for the inkjet head (hereinafter referred to as density data) is used by the reader.
It is input through line 51 to printer synchronous memory 34.

(Printer Side Processing) Before explaining the operation of the reader/printer synchronization memory 34, the head data synchronization signal generation circuit 37 will be explained. I
As shown in Figures IJ6-d and 6-e, the nozzle is synchronized with the encoder pulse of the printer main scanning motor 6b, and is the position information in the reader main scanning direction, and indicates the effective range of the separated ml helad data in the sub-scanning direction. Line enable signal (
Thereafter, N, L, E,) are created.

The N, L, E signals are sent over line 52 to head synchronization signal generation circuit 38. Head synchronization signal generation circuit 38
The signal from the printer register position sensor 16 is input through the line 53, and the time delay from when the BJ head unit 18 passes through the registration position until it reaches the copying position is determined by counting the N, L, and E signals. A signal indicating the copy width in the main scanning direction according to the copy paper size, that is, a nozzle enable signal for each color (hereinafter N, E,)
Reader-printer synchronization memory 3 via line 54
Output to 4.

The reader/printer synchronization memory 34 buffers the speed difference between the reader main scanning motor 6a and the printer main scanning motor 6b, and synchronizes the density data input from the reader with the speed of the printer. When the V, D, V signal is input from the 0 image processing circuit 33 that outputs it in synchronization with the E, signal, only the effective part of the video data is output as V.
, L, E, and are sequentially written in synchronization with the head synchronization signal generation circuit 38 to N, E.

When a signal is input, that is, when there is an inkjet head in the copying area, the density data written in the memory is used as head data to print N and L.

The data of each recording head read out from the reader/printer synchronous memory 34 sequentially in synchronization with E is outputted to the printer synchronous circuit 35 through a line 55.

In the printer synchronization circuit 35, head data of the four colors Y, M, C, and Bk, which are color-separated images of one point of the original S', are simultaneously inputted via the line 55, and the head data of these four colors is inputted simultaneously through the line 55. Position shifting processing is performed by the distance in the main scanning direction between the heads corresponding to each color.

That is, as shown in Fig. 6-f (Y, M, C).

If the distance between the inkjet heads corresponding to each Bk color is L2, the main It is sufficient to set the scanning speed to V and print each color head with a time delay of L2/V, that is, to position the Y head where the image is printed first in the main scanning forward direction M, C, Bk. This is achieved by temporarily accumulating the rad data for the colors in a buffer memory in the printer synchronization circuit 35, sequentially outputting it from the printer synchronization circuit 35, and inputting it to the printer head drive circuit 36. In FIG. 6-f, the vertical direction is the time axis, not the sub-scanning direction.

Further, the printer synchronization circuit 35 includes N and E.

A signal is input, which is a signal indicating the copy area of the head of the NE multiplied signal Y, and a head drive enable signal corresponding to each color (hereinafter referred to as H, D, E) indicating the ejection section of the head of each color from this NE multiplied signal.

signal) is output and input to the printer head drive circuit 36 through line 56. In the printer head drive circuit 36, N, E, signals, N, L.

A drive signal for the inkjet head in the printer head unit 18 and herad data corresponding to each color are output to the printer head unit 18 from E, signal, H, D, E, signal, and clock φ.

According to the above-described flow, the image of the document is read by the reader 3 and formed into an image by the printer 4. When the image controller detects the end of the V, E, and N, E, and @ signals generated from the reader 3 and printer 4, it determines the end of one-line main scanning line copying and moves to step 14) and step 15.

(Post-processing) In Stella 7'15, the sequence codon roller 23 first turns off the exposure lamp 19 and becomes a leader.

Each motor driver circuit 26a, 2 of the printer
A motor OFF signal is input to 6b, and thereafter speed data in the backward direction and a rotation start signal are sent to turn on the respective motors 8a and 6b to start backward movement and stop at the respective main scanning home positions 11 and 12. At the same time, in step 16, the reader sub-scanning stepping motor 9a (hereinafter referred to as reader sub-scanning motor) is fed a predetermined number of pulses according to the copying magnification in a rotation mode in the sub-scanning forward direction, and the reader is fed for one sub-scanning. Similarly, the printer sub-scanning stepping motor 9b (hereinafter referred to as printer sub-scanning motor) also performs l sub-scanning steps.

Next, the process proceeds to step 17, where the sub-scanning counter is incremented, and in step 18, it is determined whether or not the sub-scanning counter has advanced by the copy width in the sub-scanning direction.If the count has not advanced, the process returns to step 8 and the main scanning is started. This is repeated until the sub-scanning counter is counted up. When the sub-scanning counter is counted up, the process moves to step 2, and a predetermined number of pulses are applied to each sub-scanning motor of the reader printer for sub-scanning*i1! Return to the feed home position in the rotation mode, then proceed to step 3, perform a head recovery operation to clean the inkjet nozzle head after copying is completed, proceed to step 4, apply a cap to the head, and proceed to step 5 to issue the next copy command. Waiting for the input of 3 or more is an outline of the device operation.

(Film Projection System) The digital color double-front forming apparatus 100 of this embodiment can be equipped with projection exposure means for film projection. It is configured so that both negative and positive films can be exposed by this projection exposure means, read by the same reading sensor unit 17, and recorded by the same recording head unit 18.

FIG. 9(&) is a perspective view of the apparatus 100 with a projector attached to it.

103 is a projector 104 that projects negative and positive films; an arm that supports projection @ 103; arm 10;
5 is a level for moving the projector 103 up and down. FIG. 9 shows a connecting portion between the rail 105 and the main body 100, and 108 is a microswitch that emits a signal indicating that the projector 103 is attached to the main body 100. When the projector 103 is moved along the rail 105,
The projection surface of the projector 103 is brought into close contact with the original table glass 1.

Reading and recording operations are executed by moving the reading sensor unit 17 and the recording head unit 18, as in the case of reflection exposure described above.

FIG. 1o shows the internal configuration of the projector 103, in which the direct light emitted by the projection system illumination lamp 115 and the reflected light reflected by the first reflecting plate 114 are reflected by the condenser lens 11.
6 and reaches the window of the film carrier 117. The film carrier 117 has negative films on the top and bottom,
It has a window slightly larger than one frame of a positive slide, and a film 18 or a positive slide can be loaded inside.

The projection light reaching the upper window of the film carrier 117 projects on the film 118 to obtain an image.

Color correction is performed through the lower window by a negative color correction filter 120 or a positive color correction filter 119. In general, color correction filters for negatives depend on the type of film, but since those with an orange tone-passing base are used, a filter called an orange mask is used to remove this. In the case of Nuvozi film, it is a filter used to correct optical systems such as light sources, lenses, and reading sensors. In the case of negatives, an orange mask and a positive filter may be used together.

In addition, it is not necessary to use a filter for positive, and the positive filter 119 and the negative filter 120 are operated by a fill drive motor 123 and a positive filter position sensor 121.
, the negative filter position sensor 122 allows the negative filter to be moved to any position. Filter position sensor 121. The 22nd is a photointerrupter in this embodiment, which outputs a high level when light is blocked by a shutter. The image color-corrected by the filter is optically expanded by the magnifying lens 124, and then converted into a parallel light image by the Fresnel lens 125. Approximately 10 after this
A video signal can be obtained from a reading unit (17) located inside the camera. Figure 11 shows a film carrier 117. Inside the carrier, there is a groove the width of the negative film from one end to the other as shown in the figure, and a groove the size of the slide frame near the lower window where it originates. A positive film loading switch 127 allows automatic switching between positive and negative use. Generally, negative film is used as a continuous film of several frames, and positive slides are used by cutting out each frame one by one and attaching a regular slide frame made of cardboard or the like. Therefore, when a negative film is loaded in FIG. 11, the loading switch 127 is not pressed.

When the output signal is at a low level and a repository film is mounted, the mounting switch 127 is pressed and a mounting signal at a medium high level is output. In addition, image area slits 128a and 128b are provided on the four sides of the front, back, top, and bottom of the lower window, and are used to automatically recognize the valid image area, remove the black frame that appears in the invalid area, and record only the valid image. . That is, when reading the image projected by the projector 103 and obtaining a video signal by the sensor unit 17, the video signal will represent black in the part where no useful image comes, that is, the invalid image processing area, and if it is output as is, it will be in the effective image area. Prints black otherwise.

Therefore, in order to prevent this, the drawing area start slit) 1
The projection light passing through 28a is detected, and this detection signal is used as the start of the effective image area, and reading and recording of the projected image is started. This marks the end of the effective image area, and the reading and recording of the projected image ends. Further, the upper and lower slits are provided to select an element that can give an effective image of the reading sensor array made up of multiple elements, and these four slits make it possible to accurately record only the effective image.

FIG. 12 is a block diagram of a sequence control device and an image control unit provided inside the main body 100. In FIG. In BlockE, 129 is a microcomputer that controls the system, 130.131
.

Reference numerals 132 are drive devices for a reflection system illumination lamp, a projection system illumination lamp, and a color correction filter switching motor, respectively. 133 is a lighting lamp power supply, and the microcomputer 1
The lamp light intensity can be changed between negative and positive by controlling the voltage by the signal from 29. In this embodiment, the lamp power supply voltage is is higher for the negative than for the positive, and is adjusted to η by the lamp light amount conversion signal. In this case, the lamp light amount conversion signal was set to high level for positive and low level for negative. In block H, 134 is an image control circuit that performs image processing of the video signal.

When performing shading correction, the shading correction circuit 60 includes a RAM 137 that stores data read from a standard white board, and a table ROM 1 that performs shading correction conversion of a video signal based on the data read from the standard white board.
It consists of 38 pieces. When the shading signal is input from the microcomputer 129 to the image control circuit 134, the image control circuit 134 receives the address data and the write signal W.
By R, the RAM 137 sequentially stores reference data obtained by reading the standard whiteboard data. The reference data and the video signal of the input image are input to the address input of the ROM 138, and the video signal after shading correction is output from the output data line. At this time, the light intensity and color correction filter of the projector illumination lamp change, and the optical characteristics change between negative and positive, so the reference data is switched using the negative/positive conversion signal, and the shading correction is changed between negative and positive. shading correction is not performed in either case. In this embodiment, as shown in FIG. 12, when the film installed in the projector is negative, O is entered in all portions of the ROM 138 where reference data is input. Therefore, if negative correction data is written to the address corresponding to O, shading correction for negative film will be performed, and if data for outputting the input video signal as is is written, shading correction will not be performed.

In this embodiment, the input system gradation correction is performed by the logarithmic conversion circuit 61 using a table ROM similarly to the shading correction, and the correction is changed using a negative/positive conversion signal.

Reference numerals 140a and 140b denote a passing buffer and an inverting buffer, respectively, which invert the video signal when it is negative and rotate it forward when it is positive, so that a normal image can be obtained. The normal rotation or inversion signal is sent to the crude oil output circuit 62. shown in FIG. 8-a. The signal is input to the edge extraction circuit 63. Finally, a binarized signal is obtained, input to the gate circuit 144, and sent to the printer side.

FIG. 13 is a flowchart of the sequence of this apparatus. The operation will be explained below using FIG. 13. First, in step l, after turning on the power, it is checked whether the projector mounting switch 106 is on. If it is off, step 2
The process moves to a reflection system mode, enables the reflection system illumination lamp 110, prohibits the illumination lamp 115 of the projector 3, turns off the fan motor 126, and advances to step 6.

If the projector mounting switch 106 is off, the process moves to step 3 and enters projector mode. At this time, the 1-reflection system illumination lamp 110 is prohibited, the projection system illumination lamp 115 is enabled, and the fan motor 126 is turned on to start blowing air. After this, turn on the positive film loading switch 127.
Check off.

(I) If the switch 127 is on, the process moves to step 4 and the positive film mounting mode is entered. After that, the signal of the positive color correction filter position sensor 121 is checked to determine whether the positive color correction filter 119 is installed. If it is not installed, the filter drive motor drive signal is turned on and the filter drive motor is turned on. 12
3 and attach the positive filter 119. After that, the negative/positive conversion signal is turned on and the image control circuit 134
, the shading correction circuit 136 performs positive correction, and the passing buffer 140a is enabled to pass the data.Next, the light amount conversion signal is turned on and the lamp voltage is lowered than in the case of negative to produce positive film. Prepare and move on to step 6.

(II) If the switch 127 is off, the process moves to step 5 and the negative film mounting mode is entered. Thereafter, the signal from the negative color correction filter position sensor 122 is checked, and if it is not installed, the drive motor 123 is driven to confirm that it is installed. After that, either turn off the negative/positive signal and turn off the shading correction in the shading correction circuit 60, or select correction data different from the negative signal, and enable the inversion buffer to output the video output from the logarithmic conversion circuit 61 for input tone correction. Invert the signal and send it to the next stage.

After this, the light intensity conversion signal is set to low, the light intensity of the lamp is increased, and the process moves to step 6 in preparation for negative film.

In step 6, data such as the size of the recording paper and the magnification ratio are input from the operation panel, the area to be scanned for reading and recording the image is determined using this data, and the copy start key is input. wait. If there is no input, the process moves to step 1 to prepare for resetting by changing the mode, changing input data, etc. If the copy start key is pressed manually, proceed to step 7, determine whether the currently set mode is shooting mode or reflection mode, and if it is projection mode, proceed to step 8; If there is, the process moves to step 9 in the case of 0 reflection system mode, which has already been explained.

FIG. 14 shows the detailed flow of step 8.

In FIG. 14, first, the illumination lamp of the projector is turned on, and after confirming that the amount of light from the lamp becomes constant, main scanning of the reader is started. At this time, first turn off the image data gate signal to disable the image data gate, and then
The counter that counts from 28 to the valid image area is cleared. Next, the image data gate is turned on and off while making a judgment based on the output BK multiplication signal of the crude oil output circuit 62 in step 13 in FIG. 12, and only the effective image area is extracted and sent to the next stage. This determination will be explained with reference to FIG. 15 as well. Furthermore, COD
The arrangement direction of the elements is parallel to the longitudinal direction of the sleeve 128ab. SBK in FIG. 15 shows the black signal level.

Immediately after scanning is started, image data in the area A in FIG. 15, that is, the invalid image area, is sampled. Since the area A is an area where no light comes, the BK multiplied signal shows black. If the image data to be sampled is black, the image data gate circuit 144 is turned off to prevent the data from going to the printer. When the zero-order reading sensor 17 enters the area B, direct light from the slit The image data indicates white, and when this is determined, the image data counter is incremented and the count up, that is, slit 1.
After counting the number of image data corresponding to the distance from 28 to the effective image area, the reading sensor 17 enters the area C and turns on the image data gate circuit 144 to start transmitting the image data to the next stage. Here, in step 13, the gate is turned off until the image data becomes white, and once the image data becomes white, the process moves to step 14. Swing 14~
In step 16, it is determined that the sampled image data is white, and at the same time a counter is used to perform multiple readings in area B to take measures against disturbances such as noise.In other words, the image data changes from black to white, and the counter If the counter counts up, that point is set as a valid image area, and if data indicating a color other than white comes before the counter counts up, it is determined to be a disturbance and the process returns to step 12. In step 17, it is determined that the reading sensor 17 has entered the effective image area C, and after sending the data and data to the next stage and performing the necessary image processing, step 1 in FIG.
It returns to 0 and prints the processed data on recording paper.

When the copying of the main scan line is completed, the process returns to step 7, and the above process is performed for the next main scan, and the following readings are carried out, and when the number of sub-scans reaches the number that covers the effective image area, copying is completed. The process moves to step 1 to prepare for the next copying operation.

Effects> As described above, according to the present invention, it is not only possible to read both reflective originals and transmissive originals.

Differences in shading characteristics due to differences in the optical systems of the reflection exposure means and transmission exposure means can also be corrected, and image signals of the same form can be obtained for both.

In this embodiment, reflective exposure or transmission exposure is automatically determined, but the selection may also be made by manual input.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the device according to the embodiment of the present invention, Fig. 2 is a schematic perspective view of the device according to the embodiment of the present invention, Fig. 883 is a block diagram of the control circuit according to the embodiment of the present invention, and Fig. 4 is the sequence timing. FIG. 5 is a flowchart of the sequence, and FIG. 6-a is a diagram showing the relationship between the reader's document and the reading synchronization signal. Figure 6-b is an enlarged view of part A in Figure 6-a, Figure 6-c is an explanatory diagram of the positional shift of each color reading CCD, and Figure 6-d is a diagram showing the relationship between copy paper and recording synchronization signals. , Figure 6-e is Figure 8-
Figure d is an enlarged view of part B, Figure 6-f is an explanatory diagram of the positional deviation of each color inkjet head, and Figure 7-a is a diagram showing frequency division timing according to the magnification ratio of the encoder pulse of the reader main scanning motor. , Fig. 7-b is a diagram showing the reading pixel interval in the main scanning direction according to the magnification ratio, Fig. 1g7-c is an explanatory diagram of interpolation 1 thinning operation according to the magnification ratio, and Fig. 7-d is
Detailed circuit diagram of variable scaling buffer memory 31 of iif31N,
Figure 7-e is the video data synchronization signal generation circuit 28 shown in Figure 3.
Figure 7-f is a detailed circuit diagram of the video data synchronization signal, Figure 8-a is a detailed circuit diagram of the image processing circuit 33, and Figures 5a-b are the edge extraction circuit 63 of Figure 8-a. Figure 9 (L) is a diagram showing the input/output relationship of the projector 1.
03 and main body 10017) Perspective view, Figure 9(b) t*
Projection 4110317) Partially cutaway view, Figure 1O is projector 1
03 is a control flow chart, and FIG. 15 is an explanatory diagram of the effective image area. 6-(2 Figure 86-b data area section 1-θ Kasumi” r-b figure t-vt, E, 91j

Claims (2)

[Claims] (1) a reflection exposure means, a transmission exposure means, and a reading means for reading the image exposed by both exposure means and obtaining an image signal;
An image reading device comprising a correction means for performing shading correction on the image signal, and a control means for changing a correction method of the correction means depending on which of the exposure means is used. (2) The image reading device according to item 1, wherein the control means includes a detection means for detecting that the transmission exposure means is used.