JP3039656B2 - Image processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus that displays a full-color image based on a plurality of pieces of color component information input in a frame-sequential manner for each color component.

[Related Art] In a conventional copying machine and facsimile, a read image is directly printed out.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional image processing system, for example, a facsimile apparatus, it was not possible to monitor an image to be transmitted and an image to be received. For this reason, there is a drawback that the transmitting side cannot easily and quickly confirm whether or not the image has been correctly read.

On the other hand, the receiving side has a drawback that it is not possible to quickly detect the error or loss of the received image information without actually trying to output the information.

[Means and Actions for Solving the Problems]

SUMMARY OF THE INVENTION It is an object of the present invention to enable an image processing apparatus that inputs a plurality of color component information indicating an input image in a frame-sequential manner for each color component to quickly check an image.

In order to achieve this object, the image processing apparatus of the present invention comprises:
An image processing apparatus for displaying a full-color image based on a plurality of color component information indicating an input image, the image processing apparatus having a first bus and a second bus for transferring color component information, and Input means for inputting the color component information of each color component in a frame-sequential manner, and the color component information input in a frame-sequential manner by the input means are sequentially input from the input means via the first bus and stored. Storage means, and control means for sequentially transmitting color component information stored in the storage means in a frame-sequential manner for each color component to a display means via a second bus, wherein the control means uses the first bus. The storage of the input color component information in a storage unit and the transmission of the color component information stored in the storage unit to the display unit using the second bus are performed in parallel, so that the input image is displayed. All of the multiple color component information indicating Before being characterized in that it is sequentially displays an image corresponding to the color component information sequentially transmitted to the display unit.

〔Example〕

 FIG. 1 is a system configuration diagram of the present invention.

This system consists of a board with various functions using the system bus as a bus. The CPU board CPUB101 controls all the boards 102 to 108 via the system bus 111.

The page memories PMR102, PMG103, and PMB104 are image buffers for one page corresponding to red, green, and blue colors, respectively. Connected to / PRI109.

DMAC10, a direct memory access controller
6 reads out data from the page memories PMR102, PMG103, and PMB104, and outputs FM / DA as a frame memory for monitoring.
Data is transferred to the board 107 and written.

The FM / DA board 107 has a D / A conversion circuit, and
Image is displayed on the screen. The communication circuit 108 is a page page memory P
It is possible to read image data from MR102, PMG103, PMB104 and transmit the image to another system or another system which is the same as this system.

Next, FIG. 2 shows an example of the configuration of the scanner / printer SCA / PRI109. The apparatus shown in FIG. 2 has a digital color image reading apparatus (hereinafter, referred to as a color scanner) 1 at an upper part and a digital color image printing apparatus (hereinafter, a color printer) 2 at a lower part as shown in the figure. The color scanner 1 reads color image information of a document for each color by a color separation unit and a photoelectric conversion element such as a CCD, and converts the color image information into an electrical digital image signal. The color printer 2 is an electrophotographic laser beam color printer that reproduces a color image for each color in accordance with the digital image signal, and transfers the color image onto a recording sheet a plurality of times in a digital dot form and records the image.

 First, the outline of the color scanner 1 will be described.

Reference numeral 3 denotes an original, 4 denotes a platen glass on which the original is placed, and 5 denotes a rod door for condensing a reflected light image from the original scanned and exposed by a halogen exposure lamp 10 and inputting the image to a 1: 1 full-color sensor 6. Ray lenses, 5, 6, 7, and 10 are integrally scanned as an original scanning unit 11 to perform exposure scanning in the direction of arrow A1. The color separation image signal read line by line while exposing and scanning is amplified to a predetermined voltage by the sensor output signal amplification circuit 7 and then input to the video processing unit 12 via the signal line 501 for signal processing. 501 is a coaxial cable for ensuring a faithful transmission of a signal. A signal 502 is a signal line for supplying a drive pulse for the 1: 1 full-color sensor 6, and all necessary drive pulses are generated in the video processing unit 12. Reference numerals 8 and 9 denote a white plate and a black plate for white level correction and black level correction of an image signal, which will be described later. Used for white level correction and black level correction. 13 is a control unit having a micro computer,
This means that the display on the operation panel 20, the key input control and the control of the video processing unit 12 are controlled by the bus 508, and the position of the document scanning unit 11 is determined by the position sensors S11 and S21.
509, 510, stepping motor drive circuit control for pulse driving stepping motor 14 for moving scanning body 11 by signal line 503, halogen exposure lamp 10 by exposure lamp driver via signal line 504
Control of the color scanner unit 1 such as ON / OFF control, light quantity control, control of the digitizer 16 and internal keys via the signal line 505, and control of the display unit. A color image signal read by the above-described exposure scanning unit 11 at the time of document exposure scanning is input to the video processing unit 12 via the amplification circuit 7 and the signal line 501, and subjected to various processing described later in the unit 12. Then, the data is sent to the printer unit 2 via the interface circuit 56.

Next, an outline of the color printer 2 will be described. Reference numeral 711 denotes a scanner, which is a laser output unit that converts an image signal from the color scanner unit 1 into an optical signal, a polyhedron (for example, an octahedron)
, A motor (not shown) for rotating the mirror 712, an f / θ lens (imaging lens) 713, and the like. 714 is a reflection mirror that changes the optical path of laser light, 7
Reference numeral 15 denotes a photosensitive drum. The laser beam emitted from the laser output unit is reflected by the polygon mirror 712, passes through the lens 713 and the mirror 714, scans the surface of the photosensitive drum 715 linearly (raster scan), and forms a latent image corresponding to the original image. .

Also, 717 is a primary charger, 718 is an overall exposure lamp, 723
Is a cleaner section for collecting the residual toner not transferred,
724 is a pre-transfer charger, and these members are the photosensitive drum 7
It is located around 15.

A developing unit 726 develops an electrostatic latent image formed on the surface of the photosensitive drum 715 by laser exposure. 73
1Y, 731M, 731C, and 731Bk are development sleeves that perform direct development in contact with the photosensitive drum 715, 730Y, 730M, 730C, and 730Bk are toner hoppers that hold spare toner, and 732 is a screw that transfers developer. , These sleeves 731Y-73
1Bk, toner hopper 730Y ~ 730Bk and screw 732
Constitutes a developing unit 726, and these members are disposed around the rotation axis P of the developing unit. For example, when a yellow toner image is formed, yellow toner development is performed at the position shown in the figure, and when a magenta toner image is formed, the developing unit 726 is rotated about the axis P in the figure to expose the photosensitive element. The developing sleeve 731M in the magenta developing device is disposed at a position in contact with the body 715. The development of cyan and black operates similarly.

Reference numeral 716 denotes a transfer drum that transfers the toner image formed on the photosensitive drum 715 to paper, and 719 denotes a transfer drum 716.
An actuator plate 720 for detecting the movement position of the actuator, a position sensor 720 for detecting that the transfer drum 716 has moved to the home position by approaching the actuator plate 719, a transfer drum cleaner 725, a transfer drum cleaner 727
Is a paper pressing roller, 728 is a static eliminator, and 729 is a transfer charger. These members 719, 720, 725, 727, 729 are transfer rollers 7
It is located around 16.

On the other hand, 735,736 is a paper feed cassette for storing paper (sheets), 737,738 is a paper feed roller for feeding paper from the cassette 735,736, and 739,740,741 are timing rollers for timing of paper feed and conveyance, and via these. The paper fed and conveyed is guided by a paper guide 749 and wrapped around the transfer drum 716 while the leading end is held by a gripper described later,
The process proceeds to the image forming process.

A drum rotation motor 550 rotates the photosensitive drum 715 and the transfer drum 716 synchronously. Reference numeral 750 denotes a peeling claw that removes the paper from the transfer drum 716 after the image forming process is completed, 742 denotes a transport belt that transports the removed paper, and 743 denotes an image fixing unit that fixes the paper transported by the transport belt 742. The image fixing unit 743 includes a pair of heat pressure rollers 744 and 74.
With 5.

Next, according to FIG. 3, the control section of the scanner section
13 is explained.

The control part is CPU22 which is a micro computer
Including a video signal processing control, a lamp driver 21 for exposure and scanning, a stepping motor driver 15,
Signal lines for controlling digitizer 16 and operation panel 20
In order to obtain a desired copy via 508 (bus), 504, 503, 505, etc., it is organically controlled according to the program ROM23, RAM24, RAM25. The nonvolatile nature of the RAM 25 is ensured by the battery 31. 505 is a commonly used signal line for serial communication.
An operator inputs from the digitizer 16 according to the protocol between the PU 22 and the digitizer 16. That is, reference numeral 505 denotes a signal line for inputting coordinates, area instruction, copy mode instruction, magnification change instruction, and the like at the time of editing, for example, moving, synthesizing, etc. the original. Signal line 503
Is the scanning speed, distance,
This is a signal line for instructing a forward movement, a backward movement, etc., and the motor driver 15 inputs a predetermined pulse to the stepping motor 14 according to an instruction from the CPU 22 to give a motor rotation operation.
The serial I / Fs 29 and 30 are a general one realized by a serial I / F LSI such as Intel 8251, for example. Although not shown, the digitizer 16 and the motor driver 15 have similar circuits. doing.

S11 and S21 are sensors for detecting the position of the original exposure scanning unit (FIG. 1). The home position is detected in S11. At this position, the white level of the image signal is corrected. S21 is a sensor for detecting that a document exposure scanning unit is at the leading end of the image, and this position is a reference position of the document.

Signals ITOP, BD, VCLK, VIDEO, HSYNC, SRCOM in FIG.
(511 to 516) are the color printer units 2 in FIG.
And an interface signal between the scanner unit 1 and the scanner unit 1. All the image signals VIDEO 514 read by the scanner unit 1 are sent to the color printer unit 2 based on the above signals. ITOP is a synchronizing signal in the image feed direction, and is generated once for one screen transmission, that is, once for each of four color (yellow, magenta, cyan, and black) image transmissions. When the leading end of the transfer paper wound on the transfer drum 716 of the printer unit 2 receives the transfer of the toner image at the contact point with the photosensitive drum 715, the transfer drum 716, The video processing unit 12 in the scanner unit 1 is synchronized with the rotation of the photosensitive drum 715.
And input as an interrupt of the CPU 22 in the controller 13 (signal 511). The CPU 22 performs image control in the sub-scanning direction for editing or the like based on the ITOP interrupt. BD
Reference numeral 512 denotes a raster scan direction synchronization signal generated once per rotation of the polygon mirror 712, that is, once per raster scan. The image signal read by the scanner unit 1 is synchronized with the BD one line at a time in the main scanning direction. Printer part 2
Sent to VCLK 513 is a synchronizing clock for transmitting an 8-bit digital video signal 514 to the color printer unit 2, and the video data is transmitted via a flip-flop circuit.
Send 514. The HSYNC 515 is a main scanning direction synchronization signal generated in synchronization with the VCLK 513 from the BD signal 512, has the same period as BD, and the VIDEO signal 514 is strictly transmitted in synchronization with the HSYNC 515. This is because the BD signal 515 is generated in synchronization with the rotation of the polygon mirror, so that a lot of motor jitter that rotates the polygon mirror 712 is included. HSYNC515 generated synchronously with jitter-free VCLK
Is necessary. SRCOM is a signal line for half-duplex bidirectional serial communication, and indicates an instruction from the scanner unit 1 to the printer unit 2, for example, color mode, cassette selection, etc., and printer unit status information, such as jam, no paper, All information such as weights are exchanged via the communication line SRCOM.

(Input of Image Data) The SCA / PRI 109 composed of the scanner unit 1 and the printer unit 2 as described above is connected to the SPI / F 105 as its interface. SPI / F105 is CPU board CPU
When an image read instruction is received from B101 via the system bus 111, the SCA / PRI 109 is activated to read an image. SCA / PRI109 is a frame sequential scanner printer,
Each color component R (red), G (green), B (blue)
Are sequentially input / output one page at a time.

The scanner / printer interface SPI / F 105 that has received the image read instruction itself becomes a bus master and outputs the image data to the system bus 111 in real time as it is. At this time, the CPU board CPUB101 waits for an interrupt, and the page memory PMR102,
A signal (memory selection signal) designating which board of PMG103 or PMB104 to access is supplied from the scanner / printer interface SPI / F105. Page memory PMR1
02, PMG103, and PMB104 each determine whether the board number specified by the memory selection signal matches its own board number, and only when they match, the system bus 111
One page of the middle image data is written in the memory. In this way, the corresponding page memories PMR102, PMG103, and PMB104 sequentially read the images on the system bus 111 in accordance with the image data output of three colors (R, G, B) of the scanner / printer SCA / PRI109. Scanner printer SCA / PRI109
Can simultaneously input and output three colors (R, G, B) of image data, the data bus width of the system bus is expanded to allow three page memories PMR102 and PMG in one scan.
103, PMB104 can be written. When data is written to all page memories, the scanner / printer interface SPI / F105 generates an interrupt signal on the system bus 111 and passes control to the CPU board CPUB101.

(Output of image data) Page memory PMR102, P fetched as described above
To obtain the image data of MG103 and PMB104 as a hard copy, the scanner / printer interface SPI / F105
Interface the scanner printer SCA / PRI109 and transfer the image to the scanner printer SCA / PRI109.

Scanner / Printer interface SPI / F105 is CPU
When an image write instruction is received from the board CPUB101 via the system bus 111, the scanner / printer SCA / PRI109 is activated and becomes a bus master, and the page memory PMR102, PR
Scanner printer SC sequentially from each board of MG103, PMB104
Outputs image data for each color to A / PRI109. At this time, CP
The U-board CPUB101 is waiting for an interrupt, and when the image output to the printer is completed, the scanner / printer interface SPI / F105 generates an interrupt signal on the system bus and passes control to the CPU board CPUB101.

(Image display) Image data is stored in page memories PMR102, PMG103,
The PMB 104 stores color data for each color in another address space as shown in FIG. 4B, and the monitor frame memory FM / DA 107 stores the image data as shown in FIG. Three colors (R, G, B) are mapped in the same address space. In other words, the former addresses memory, R, G, B
And the latter is data packed in three colors of R, G and B. The former is called a frame sequential memory, and the latter is called a pixel sequential memory.

Next, control of image display will be described with reference to the flowchart of FIG. In step S1, as described above, the CPU
Scanner from board CPUB101 via system bus 111
When the image read signal is input to the printer interface SPI / F105, the scanner / printer interface
The SPI / F 105 activates the scanner / printer SCA / PRI109. Then, the R data of the image is written into the page memory PMR for one page memory. Similarly, in steps S2 and S3, the G data and B data are respectively stored in the page memory PMG10.
3, Stored in PMB104. When the image data is stored in the page memories of all three colors, the scanner / printer interface SPI / F105 generates an interrupt signal and returns to the CPU.
The board CPUB101 becomes the bus master. Next, CPU board CPUB
101 passes control to the direct memory access controller DMAC 106 in steps S4 to S9. D became the bus master
In step S4, the MAC 106 reads the R data for one pixel from the R data page memory PMR102 and holds it in the DMAC.
Next, in step S5, the G data page memory PMG103
Data is read for one pixel and held in the DMAC. In step S6, the same holds for the B data. Next, in step S7, the R, G, and B data of 8 bits are packed and transferred to the monitor frame memory FM / DA 107 as one 24-bit data. This frame memory FM / DA107
Is a two-port memory, and the contents of the memory can be displayed on the monitor 110 even while the CPU board CPUB101 or the DMA controller DMAC106 is accessing via the system bus. The pixel data is D / A converted and displayed on the monitor 110. In step S9, it is checked whether or not one page of image data has been transferred from each of the page memories PMR102, PMG103, and PMB104 to the monitor frame memory FM / DA107. The above steps S4 to S9 are repeated until the data is transferred. When the transfer of the image data for one page is completed, the DMA controller DMAC 106 sets the system bus 11
Generates an interrupt signal on 1 and controls the CPU board CPUB
Hand over to 101.

[Other embodiments]

FIG. 6 is a system configuration diagram for explaining a second embodiment of the present invention.

In the following description, points different from the first embodiment described above will be described, and description of common parts will be omitted.

In the second embodiment, in addition to the system bus 111, a high-speed bus 112 is provided between the page memories PMR102, PMG103, PMB104 and the scanner / printer interface SPI / F105.

(Input of Image Data) In the second embodiment, the data is read by the scanner / printer SCA / PRI109 and is read by the scanner / printer interface SPI / PRI109.
The image data input to F105 is transferred to page memories PMR102, PMG103, and PMB104 for each color via high-speed bus 112.

(Output of image data) The page memories PMR102, PMG103,
To obtain the image data of the PMB 104 as a hard copy, the image is transferred to the scanner / printer SCA / PRi109 using the scanner / printer interface SPI / F105 as an interface. Since the SPI / F105 does not have a page buffer, the page memories PMR102, PMG103, PMB104 and SCA / PRI109
Image transfer with other printers in real time. At this time, the flow of image signals between the page memories PMR102, PMG103, PMB104 and the SPI / F 105 is performed using a high-speed bus. SPI / F105
Outputs the color components being printed by the SCA / PRi109 printer as control signals of the high-speed bus, and the boards of PMR102, PMG103, and PMB104 determine whether or not they are selected by the control signals, and are selected. In this case, an image is output for each horizontal raster in synchronization with the synchronization signal output by the SPI / F.

(Image Display) In the second embodiment, a page-sequential memory is used as a page memory, and a pixel-sequential memory is used as a monitor frame memory. Image display control flowchart is 7th
Shown in the figure. FIG. 8 shows the activation of the scanner / printer SCA / PRI 109 and the timing chart of DMA from the page memories PMR102, PMG103, and PMB104 to the frame memory FM / DA107. The system shown in FIG. 6 has two buses, a high-speed bus 112 and a serial bus 111, so that image data can be simultaneously transmitted to the two buses. By utilizing this, the image reading of the scanner / printer SCA / PRI109 and the image data transfer by the DMA controller DMAC106 are performed simultaneously.

In step S10, when an instruction to read an image is issued to the CPU board CPUB101 and the scanner / printer interface SPI / F105, R data is written to the page memory PMR102 in real time via the high-speed bus. When writing of R data for one page is completed, DMA controller D
The MAC 106 detects the write end signal output on the system bus 111 in step S14, and in step S15, from the page memory PMR102 to the monitor frame memory FM / DA107.
The image data is transferred to the upper frame memory by DMA via the system bus. Here, since the frame memory is a pixel sequential memory, the G area and the B area are masked so that data is written so that only the area of R data (8 bits) is accessed at the same address in FIG. 4A. Need to be kept away.

Next, the CPU board CPUB101 writes the G data into the page memory PMG103 via the high-speed bus again in step S11 while the DMA controller DMAC 106 is performing step S15. Then, while the G data is being written to the page memory PMG103, step S15 ends and the DMA controller DM
The AC 106 waits for the end of the step S11. Step S14-15
When the end of step S11 is detected in step S16, the DMA controller DMAC 106 executes step S17.
At the same time, in step S12, the scanner / printer SCA / P
The B data is transferred from the RI 109 to the PMB 104. When the transfer is completed, in steps S18 to S19, this time the DMA controller DMAC
The DMA transfer is performed to the frame memory FM / DA 107 by 106,
Finally, the R, G, B image data is stored in the monitor frame memory F.
The image is transferred to the M / DA, and an image is displayed on the monitor 110. The frame memory FM / DA 107 has a two-port memory, and the CPU board CPUB101 or the DMA controller DMAC 107 can write image data via the system bus 111 even when an image is being displayed on the monitor 110, The display screen is not disturbed. Therefore, step S15
Is completed, the R data is displayed on the monitor 110,
At the end of step S17, the data of R and G are stored in step S19.
At the end of the process, R, G, B full color images are displayed on the monitor 110. Looking at the time flow of each operation, the time chart is as shown in FIG.

As described above, by providing two buses, the time required for reading an original from the scanner and displaying it on the monitor can be greatly reduced. Further, at the time when one of the three scans of R, G, and B is completed, the entire image can be confirmed although it is a single color of red (R).

 FIG. 9 is a diagram for explaining the third embodiment.

In the second embodiment, the page memories PMR102, PMG103, PMB1
From 04, the DMA controller DMAC 106 transfers images to the monitor frame memory FM / DA 107 in a frame-sequential manner. At this time, the monitor 110 first displays the R data, then displays the R and G data, and finally displays the R, G, B full color image.

In this embodiment, when displaying an image from the monitor frame memory FM / DA 107 on the monitor 110, the image data 113 and the R, G, B lookup table RLUT122, GLUT123,
A selector 117 is provided between the selector and the BLUT. The flow of the image data is based on the input signal lines DR114, DG of each color of R, G, B to the selector 117.
115, input to the selector 117 via the DB 116, and the selection signal 11
According to 8, the signals are selectively output to the output signal lines 122, 123, and 124. Then, each data output from the selector 117 is R
Look-up table for ed RLUT122, Look-up table for Green GLUT123, Look-up table for Blue BLUT1
After the data conversion, the D / A converters 125 and 12
At 6,127, the data becomes analog data, is input to the monitor 110, and is displayed on the monitor 110.

The selection signal 118 is transmitted to the R, G, B
Trigger the DMA transfer as shown in FIG. By changing the input and output according to the selection signal 118 as shown in FIG.
In the third display, a black-and-white image is displayed on the monitor, and in the third display, a full-color image is displayed.

It is clear that various displays are possible by changing the contents of the input / output table in the table of FIG.

In the second embodiment, only the R data is displayed in the frame sequential display, or only the R and G data are displayed.
Although there was a problem that it was difficult to see the image depending on the symmetric image, providing the selector between the frame memory and the look-up table in this manner has an effect that the display becomes easy to see.

〔The invention's effect〕

As described above, according to the present invention, before all of the plurality of pieces of color component information indicating the input image are input, the images corresponding to the sequentially transmitted color component information are sequentially displayed on the display unit. The outline of the image can be confirmed before all of the plurality of pieces of color component information indicating the input image are input.

Therefore, based on a plurality of pieces of color component information indicating an input image, an image processing apparatus for displaying a full-color image can quickly confirm the input image.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of one embodiment of the present invention, FIG. 2 is a schematic view of a scanner / printer, FIG. 3 is a block diagram of a controller of the scanner / printer, and FIG. 4 is an address space of an image memory. FIG. 5 is a flowchart of the display operation, FIG. 6 is an overall configuration diagram in the second embodiment, FIG. 7 is a flowchart of the display operation in the second embodiment, FIG. FIG. 9 is a diagram showing a processing unit of a monitor input signal, and FIG. 10 is a diagram showing a selector input / output relationship. 101 CPU board 102, 103, 104 Page memory 105 Scanner / printer interface 106 Direct memory access controller 107 Monitor frame memory 108 Communication circuit 109 Scanner / printer 110 Monitor 111 System bus 112 High-speed bus 113 Image data 114,115,116 Input data line 117 Selector 118 Selected signal line 119,120,121 Data line 122,123,124 Look-up table 125,126,127 D / D converter 1 Scanner 2 Printer

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sachi Enoda 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-62-60352 (JP, A) JP-A-62 JP-A-236260 (JP, A) JP-A-63-256054 (JP, A) JP-A-59-225673 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 1/21 G06F 15/62 G09G 5/34 H04N 1/00

Claims (1)

(57) [Claims] An image processing apparatus for displaying a full-color image based on a plurality of pieces of color component information indicating an input image, comprising: a first bus and a second bus for transferring color component information; Input means for inputting a plurality of color component information indicating an input image in a frame-sequential manner for each color component; and color component information input in a frame-sequential manner by the input means, sequentially from the input means via the first bus. A storage unit for inputting and storing, and a control unit for sequentially transmitting color component information stored in the storage unit in a frame-sequential manner for each color component to a display unit via a second bus. The storage of the input color component information in the storage means using a bus and the transmission of the color component information stored in the storage means to the display means using the second bus are performed in parallel. A plurality of color components indicating the input image Before all broadcast is inputted, the image processing apparatus for causing sequentially displays an image corresponding to the color component information sequentially transmitted to the display unit.