JPS63167571A - Image forming device - Google Patents

Abstract

PURPOSE:To attain color correction at a high speed by applying color correction processing at the reception of data. CONSTITUTION:The content of a received data from the host side, in case of a gradation data (e.g., magenta), is sent in the order of n-set of gradation codes corresponding to the address on a frame memory and a color end code. With an input signal from an FF 32 to a PORT 12 at logical H, an I/O port 5 discriminates the presence of a received data to discriminate whether or not the data is a color designation code. In the presence of color designation code, the level of a PORT 8 is brought into an L level and either of PORTs 9, 10 goes to H. A ROM being a color correction means uses the reception data and a signal from the PORTs 8 10 as the address to send the corresponding color correction data to the I/O port 5. Then the I/O port 5 writes the received data subject to color correction to a frame memory (not shown).

Description

[Detailed description of the invention] Gito Kusara The present invention relates to an image forming apparatus.

In general, color printers capable of forming color images are used as various image forming devices (hereinafter referred to as "printers") such as printing devices using an electrophotographic process such as laser printers, thermal printers, or inkjet printers. be.

In such color printers, for example, when printing images from a television receiver, color correction is required to convert the input to linear characteristics, and the calculation processing of many dots must be performed as fast as the clock speed. You have to do it.

1-Blood This invention has been made in view of the above points, and an object thereof is to speed up one-color correction processing.

In order to achieve the above-mentioned object, this invention is provided with a function of performing color correction when receiving data.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

FIG. 1 is a block diagram showing an example of an image processing controller of a printer embodying the present invention.

The microprocessor (CPU) 1 is a central processing unit, R
It consists of OM, RAM, Ilo, etc., and controls the entire image processing. The ROM 2 stores fixed information such as programs and color palettes for converting character codes into gradation data.

RAMES is used as a working area of the microprocessor 1, etc.

The frame memory 4 stores received data transferred from the host side via the I10 port 5. The arithmetic processor 6 takes in the data written in the frame memory 4 and performs various filtering processes such as edge enhancement and smoothing.
Various processes such as enlargement/reduction processing, nine rotation processing, UCR (undercolor removal) processing, and dither processing (binarization processing) are performed, and the processed data is written into the frame memory 4 again. The data stored in the frame memory 4 is sent to the printer engine via the machine/○ port 7. l108
is an input/output interface for switches and indicators (not shown).

As shown in FIG.
), a page memory 4c having a capacity for one page for storing data for magenta (M), a page memory 4M having a capacity for one page for storing data for magenta (M), and a page memory 4M for storing data for magenta (M), and a page memory 4M for storing data for yellow (Y). The page memory 4Y has a capacity for one page for storing data for black (K), and the page memory 4 has a capacity for one page for storing data for black (K). Also, frame memories 4C, 4M, and 4y.

It also includes a character data set memory 4A for a flag indicating whether or not the relevant bit of No. 4 is based on a character code. In addition, each frame memory 4C, 4M14 y p 4
If x is 640×480 dots, the capacity is 0.3 Mbytes.

FIG. 3 is a schematic configuration diagram showing an example of a printer engine.

This printer engine rotates a drum-shaped photoreceptor 11 in the direction of the arrow, and first uniformly charges the surface with a charger 12, and then emits laser light from a laser diode 13 according to the color image to be printed. is modulated on/off, and this laser light is transmitted to the photoreceptor 1 via a mirror 14.
1 to form an electrostatic latent image corresponding to the color image to be printed. The modulation of this laser diode 13 is changed to cyan (
C), magenta (M), yellow (Y), black (K
) for each page memory 4C, 4M, 4y.

This is performed sequentially for each color using data generated based on data stored in 4K.

and cyan toner developer 15. Magenta toner developer 16. Select the developer corresponding to the color to be printed from among the developer 17 for yellow toner and the developer 18 for black toner, and apply the color to the electrostatic latent image corresponding to the image of the color to be printed on the photoreceptor 11. A coloring material (toner) is attached and visualized.

On the other hand, the uppermost paper 20 held in the paper feed cassette 19 is fed by the paper feed roller 21 and sent to the transfer position at a predetermined timing, and a high voltage is applied to the transfer charger 22 at a predetermined timing. The toner image on the photoreceptor 11 is transferred to the paper 20.

Thereafter, the charge remaining on the photoconductor 11 is eliminated by a quenching lamp 23, and the toner remaining on the photoconductor 11 is removed by a cleaning brush 24 and collected in a waste toner bottle 25, and the toner remaining on the photoconductor 11 is removed by a cleaning brush 24 and collected in a waste toner bottle 25. The body 11 is placed in an initial state for the image forming process. Further, the paper 20 is returned to a predetermined position for the next color printing. However, paper 20
may be rotated for the next color print.

Then, in the same manner as described above, the laser diode 13 is modulated on/off in accordance with the next color image to be printed, and the toner image of that color is transferred onto the paper 20.

By repeating this action, cyan.

After forming a color toner image on the paper 20 using magenta, yellow, and black coloring materials, the paper 20 is sent to a fixing unit 27, subjected to fixing processing, and then discharged to a paper discharge stacker on the second day.

FIG. 4 is a block diagram showing details of the data receiving section.

The ROM 31 is a color correction value conversion means, and as shown in FIG. 5, data having the same value as the address data is stored.

It stores cyan color correction value data, magenta color correction value data, and yellow color correction value data. In this way, the data is stored in the ROM 51 along with the color correction value data as "O".
By arranging them in order from to the maximum function value (255 in this example) or from the maximum function value, the same data as the received data can be output, that is, codes such as character codes and commands can be received without switching the signal line. be able to.

This ROM 51 outputs data from data terminals D0 to D7 in accordance with the combinations shown in FIG.

In other words, when address data A8 is 1', the same data as the received data is output, and when address data A9 is 1', the received data is converted to cyan color correction value data and output, and address data AIO is 1', the received data is converted into magenta color correction value data and output.

When the address data All is 1'', the received data is converted to yellow color correction value data and output.
Other memory such as RAM with backup can also be used in place of M.

A flip-flop (FF) circuit 32 is set when a strobe signal 5TROBE from the host side is input, and outputs a busy signal BUSY to the host and also outputs a busy signal BUSY to the host.
○Outputs data present to port PORT12 of port 5, and is cleared by a signal from port PORT13 of port 5 of I10.

In addition, the operation of PoRTO to 13 of I10 port 5 is
As shown in the figure, ports PORTO~7 receive data, port 8 specifies the code, and port PORT8 receives data.
9 is designated as cyan, port PORT10tt? Zenta specification, port PORTI 1 is yellow specification, port POR
It is defined that T12 has data and port PORT13 is BUSY clear.

Next, the operation of this embodiment configured as described above will be explained with reference to FIG. 7 and subsequent figures.

First, when the content of the data received from the host side is gradation data (magenta is taken as an example), as shown in Figure 7, first, the color specification code rCEX PJ (P=magenta) is sent.
is sent, then n magenta gradation codes are sent corresponding to the addresses on the printing paper (frame memory) shown in FIG. 8, and finally a color end code rFFJ is sent. In addition, in the case of a character code, for example, A as shown in Figure 9.
A SCII code and color data specifying the color number of the character indicated by the code are sent as a pair.

Therefore, referring to FIG. 10, the I10 port 5 checks whether the input signal from the FF circuit 32 to the port PORT12 is H° to determine whether there is data received from the host.

If there is received data, it is determined whether the received data is a color designation code rcEXJ or not, and if it is not a color designation code, the port PORT8 is set to 1'. Thereby,
When RoM51 receives 1 byte of data, it sends the same data as the received data, that is, character code or color data, to I10.
Output to port 5.

Therefore, the received color data is converted into cyan using a color palette as shown in FIG. 11, for example.

Convert to each FL tone data of magenta and yellow,
These gradation data of each color are stored in the frame memory 4c of each color.
After setting the relevant bit of p 4ut 4y, 1' is set to the relevant bit of the one character data set memory 4A. By providing a color palette for converting character codes into gradation data in this manner, character codes can be easily converted into gradation data.

On the other hand, if the received data is not a color specification code,
One byte of data is received, and one of ports PORT9-11 is set to 1 in accordance with the color indicated by this data. Thereby, the ROM 31 receives the data, converts the received data into color correction value data of the designated color, and outputs the data to the I10 port 5.

At this time, if the received data is not the color end code rFFJ, it is determined whether the corresponding bit in the character data set memory 4A is set to 1', and the corresponding bit is set to 1'.
If set to , priority will be given to data based on character codes and frame memory 40F 4M, 4Yt! : Move to the next data reception without rewriting, and if the corresponding bit is not set to 1', data is transferred to the frame memories 4C, 4M.

Store in 4Y.

Further, when the received data reaches the color end code rFFJ, the I10 port 5 resets the ports PORT9 to 11 to 0', sets the port 8 to 1' again, and returns to the state of character code reception.

In this way, color correction can be performed at high speed by performing color correction processing when receiving data. At the same time, when image data from the host is received not only as image data but also as a character code, priority is given to the character code, which prevents blurring when printing characters and improves image quality. .

As described above, according to the present invention, it is possible to speed up color correction processing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an image processing controller of a printer embodying the present invention. FIG. 2 is a block diagram showing the configuration of the frame memory, FIG. 3 is a schematic configuration diagram showing an example of the printer engine, FIG. 4 is a block diagram showing details of the receiving section from the host side, and FIG. 11 to 11 are explanatory views for explaining the operation thereof. 1... Microprocessor 4... Frame memory 5... Engineering/○ port 1 6
... Arithmetic processor 31 ... ROM Figure 1 Figure 4 Figure 5 Figure 7 Figure 9

Claims (1)

[Scope of Claims] 1. An image forming apparatus characterized by comprising a color correction value conversion means for inputting received data and converting it into a color correction value of a specified color. 2. Claim No. 2, comprising a determining means for determining whether received data is image data or a character code, and means for controlling data storage in a frame memory according to the determination result of the determining means. The image forming apparatus according to item 1.