JPH03180866A - Digital color copying machine - Google Patents

Abstract

PURPOSE:To obtain a color copying machine where the color of an original surface is faithfully discriminated and a transfer paper corresponding to the discriminated color is selected by providing a surface color judging means, a transfer sheet color detecting means, and a control means instructing the selection of a paper feeding cassette from the outputs of the both means. CONSTITUTION:Original surface color data detected and judged by a CCD 4 and color judging parts 10 and 11 is fetched in a CPU 12. On the other hand, the color data of the transfer paper in the paper feeding cassette 17, which is detected by a color sensor 13, is fetched in the CPU 12 as well. The CPU 12 compares both data in accordance with a prescribed program, and instructs the selection of the paper feeding cassette 17 housing the transfer paper corresponding to the color of the original. The instruction makes for instance, the prescribed color display part 19 of an operating part 14 turning on and off. At this time, an user depresses a cassette selecting button corresponding to the display part 19, so that a desired paper feeding cassette is selected out of the paper feeding cassettes 17.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a digital camera that drives a radar based on a plurality of digital signals read by a scanner and separated into colors, and performs optical writing on a photoreceptor using a polygon mirror. Regarding color copying machines.

[Conventional technology]

In recent years, not only analog copying machines but also the above-mentioned digital color copying machines have become widely known.

When using such a digital color copying machine, there is an increasing demand to reproduce not only a picture image or a single character image of a document, but also the color of the background of the document.

Recently, various types of transfer paper on which original images are copied have been used, and the color of the transfer paper in each cassette is also determined in advance.

[Problem to be solved by the invention]

In the prior art, it was not possible to accurately determine the color of the background of a document, and it was not possible to select a transfer sheet that had been determined in advance based on document information other than the size.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital color copying machine that can accurately determine the background color of an original and select transfer paper according to the color of the original background.

[Means to solve the problem]

The above purpose is to use a digital color copying machine that drives a laser based on multiple color-separated digital signals read by a scanner and writes light onto a photoreceptor using a polygon mirror. A background color determining means for determining the background color of the original, a color detecting means for detecting the color of the transfer paper in the paper feed cassette, and a transfer that matches the original background color from the outputs of the background color determining means and the color detecting means. It is distantly related to the present invention by including a control means for instructing selection of a paper feed cassette containing paper.

[Effect]

The background color determination means determines the background color of the document from a plurality of color-separated digital signals, and the color detection means detects the color of the transfer paper in the paper feed cassette. Then, the control means compares the original background color information from the background color determination means and the transfer paper color information from the color detection means, and instructs to select a transfer paper whose color matches the original background color.

Note that this instruction may be in the form of a lighting display on the operation unit so that the user can select the paper feed cassette, or may be in the form of automatically selecting the paper feed cassette.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 is a schematic diagram of the optical system of a digital color copying machine, including a fluorescent lamp 1 for illuminating a document, a mirror 2-1, 2-2, and a mirror 2-1.
．． 2-3, an imaging lens 3, etc. constitute a scanner. The optical signal from the scanner is transmitted to a CCD, which is a photoelectric conversion element.
Loaded into 4.

The CCD 4 converts the intensity of the projected light into an electrical signal, which is further output as a digital signal No. 18 by an A/D converter. This digital signal is then decomposed into Y, M, C, shading correction, UC
After various image processing such as RC under color removal and density correction is performed, the image is sent to a semiconductor laser (not shown), and this semiconductor laser is turned on.

Control off. Then, this laser beam is
By being deflected by the mirror 5, optical writing is performed on a photoreceptor (not shown). Note that 6 is a scanner power supply fan.

FIG. 2 is a control block diagram of the original background determination section of the digital color copying machine according to the present invention, and FIGS. 3 and 4 are flowcharts of the control contents.
4M and 4C are 2M for Y each with A/D converter.
It is a COD for C and C. Further, 10 is a first color determining section, 11 is a second color determining section, and further color determining sections having a similar configuration are provided as necessary, and these collectively determine the background color of the document. It constitutes a background color judgment means.

The color determination units 10 and 11 each have a comparator 10-1.
．． 10-2.10-3, AND gate 10-4, counter 1O-5 (, CT1), and comparator 11-1.
11-2, 11-3, AND gate 11-4, and counter 11-5 (CT2) are connected as shown in the figure.

Next, the control operation will be explained based on FIGS. 3 and 4.

First, in FIG. 3, it is determined whether the original is read by a scanner and the image data is input manually (2-1), and if it is input, Y is read.

The three M and C data are input to three sets of comparators that judge each color, and one color is judged in each set. First of all, assuming that the counter for a certain color (for example, pink) is CT1, a subroutine is executed to check whether CT1, that is, the background color of the original is pink (
2-2).

That is, if the data of Y in the comparator 10-1 is within a predetermined range (Y in 2-3), it is set to high level. Similarly, if the data of M and C are within the predetermined range in the comparator 10-2 (Y in 2-4 and 25), the output of the three-man power AND gate 10-4 will be at a high level, and C
Count up T1 (2-6). If the counter CTI counts up here, it can be seen that the image is pink.

Similarly, for example, if the blue counter is CT2, CT
When executing the 2-check subroutine (2-7),
If each data of Y, M, and C are all within the predetermined values (2-8
, 2-9, 2-10 (Y), and count up CT2 (2-11). CT3 yellow check (2
-12) is the same, and the counters for each color can be set to CT2, CT3, . −−・−−−−. Then, the entire document surface is scanned, the image data of the entire screen is read in by the CCD 4, and the color is determined one pixel (l dot) at a time.

FIG. 4 shows a subroutine for determining the background color. If the total number of pixels is, for example, 1000, if there is a pixel of a color with 850 or more pixels, this is determined as the background color.

First, if the CTI is 850 or higher (Y in 3-l), CT
The color I, that is, pink, is set as the background color (3-2). Also, if CT2 is 850 or more (Y at 3-3), CT
The color No. 2, that is, the blue color, is set as the background color (3-4). Furthermore, if CT3 is 850 or more (Y at 3-5), CT3
, that is, yellow, is the background color. The same applies below.

Here, the comparison value of the comparator may be set by scanning the paper and using the color data obtained thereby. The average color data of the originals consisting of Y, 150, M, 30
．． C, 240, Y between 140 and 160, M
is determined to be 50 or less, C to be between 220 and &:)255, and so on.

FIG. 1 is a control block diagram of a digital color copying machine according to the present invention, in which 12 is a CPU, 13 is a color sensor, 14 is an operation section, 15 is a RAM that stores various data and variables, and 16 is a control block diagram of the CPU 12. This is a ROM with a built-in sequence program.

FIG. 6 is a configuration diagram of the paper feed section of a digital color copying machine, in which paper feed cassettes 17 (17a to 17e) are provided in five stages in order from the first cassette. Color sensor 13 (13a-
13e) are arranged.

FIG. 7 is a plan view of the main parts of the operation section 14, in which 18 is a print key, 19 is a color display section of each paper feed cassette 17, and 2
0 is also a cassette selection button.

Returning to FIG. 1 again, the original background color data detected and determined by the CCD 4 and the color determination sections 10 and 11 is taken into the CPU 12. On the other hand, detected by the color sensor 13,
The color data of the transfer paper in the paper feed cassette 17 is also taken into the CPU 12.

The CPU 12 compares the original background color data and the color data of the transfer paper according to a predetermined program, and selects the transfer paper that matches the original background color.

More specifically, a selection instruction is given to the paper feed cassette l-17 containing the transfer paper.

This selection instruction is, for example, a predetermined color display section 1 of the operation section 14.
9 may be made to blink. Then, the user can press the cassette selection button 20 corresponding to the color display section 19.
A desired paper feed cassette 17 can be selected by pressing .

Of course, from the CPU 12 there is a clutch (not shown).

A desired paper feed cassette 17 may be automatically selected by outputting a command signal to a solenoid or the like.

Note that the background color determining means described in the claims is CC
D4 and the color determination sections to and i1, the color sensor 13 as the color detection means, and the CPU 12 as the control means.

〔Effect of the invention〕

As explained above, according to the present invention, since the image data is digitized, it is possible to accurately determine the background color of the original, and it is also possible to select transfer paper that corresponds to this background color. Therefore, it is possible to provide a digital color copying machine that can obtain a copy image that is faithful to the color of the original.

[Brief explanation of drawings]

FIG. 1 is a control block diagram of a digital color copying machine according to the present invention, FIG. 2 is a block diagram of itr control of a document background determination section of a digital color copying machine according to the present invention, and FIGS. 3 and 4 are control blocks of a digital color copying machine according to the present invention. Flowchart of contents, Figure 5 is a schematic diagram of the optical system of the digital color copying machine, Figure 6 is a diagram of the configuration of the paper feed section of the digital color copying machine, and Figure 7 is a plan view of the main parts of the operation section. be. 1...Fluorescent lamp, 2-1.2-2.2-3...Mirror 3...Imaging lens, 4...CCD, 5...Polygon mirror 10.11...Color judgment Part, 12...CPU,
13...Color sensor, 17...Paper feed cassette. Figure Figure 6 Figure 6 Funeral map

Claims (2)

[Claims] (1) In a digital color copying machine that drives a laser based on multiple color-separated digital signals read by a scanner and writes light onto a photoreceptor using a polygon mirror, a document is converted from multiple color-separated digital signals. A background color determining means for determining the background color of the document, a color detecting means for detecting the color of the transfer paper in the paper feed cassette, and a transfer paper that matches the background color of the original from the outputs of the background color determining means and the color detecting means. 1. A digital color copying machine, comprising: control means for instructing selection of a paper feed cassette containing a paper feed cassette. (2) In claim 1, the background color determining means comprises:
a comparator that inputs digital signals separated into Y, M, and C colors and determines whether they are within predetermined values;
A digital color copying machine comprising a counter that counts up when all color-separated digital signals are within a predetermined value.