JPH0797819B2 - Color image processing device - Google Patents

Description

The present invention relates to a device for reading a color image of a document and performing image processing.

[Conventional technology]

As a device for picking up an image of a document and separating the image into black, red, blue and the like to make a copy, for example, JP-A-57-147374 and JP-A-58-62769.
Etc. are known. These are, as shown in FIG.
The analog signal obtained by the image sensors 21 and 22 such as CCD is calculated by the operational amplifier 23 and the AGC circuits 24 to 26 and binarized circuit 2
Binarize 7 to 29, and use the data after binarization in the arithmetic circuit 30
Color separation is performed by calculating with. Therefore, processing of image data in such devices (eg MTF
Correction, enlargement / reduction, γ correction, etc.) is performed on the analog image signal group before color separation, or a binarized image after color separation in which only limited processing is possible. There are only two ways to do it for the data group.

However, in the former case, a plurality of circuits are required, and it is difficult to process because an analog signal is used as a partner. On the other hand, in the latter case, although processing such as enlargement / reduction can be performed, the possible processing is limited to the binarized image data, and it is difficult to obtain high image quality. In addition, conventionally, it is also known that there is an unnecessary color in the image data after color separation, which causes deterioration of the image quality. However, the method of removing these unnecessary colors is based on the color-separated binarized information. Is based on. Therefore, it is very difficult to perform image processing after color separation in the conventional color separation method.

Considering the processing before the color separation, various variation factors are influenced by the respective processing, which makes the color separation difficult or the removal of the unnecessary color becomes difficult.

Therefore, as a method for solving the above-mentioned drawbacks, a method has been proposed in which color separation is not performed after binarization, but color separation is performed as it is as multivalued data, and various image processing is performed after the color separation.

[Object of the Invention]

An object of the present invention is to use the above-described processing method to make the processing relating to the designated area correspond to the marker color.

[Structure of Invention]

A color image processing apparatus of the present invention processes an original color image signal of a color image in which a specific area portion is designated by a color marker, separates one corresponding to one pixel into color data and density data. A first image processing means for generating a color image signal composed of a plurality of bits; a second image processing means for processing the color data to detect an area of a color marker; a color of the color marker and an image processing function; Is preset in a one-to-one relationship, and third image processing means for performing image processing according to the color of the color marker on the image inside or outside the area of the color marker detected by the second image processing means. It is configured to have and.

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a diagram showing an embodiment thereof. The color image information (optical image) of the original is separated into two colors (red and cyan) by a dichroic mirror and read by CCDs 1 and 2, each of which is A / D converted by A / D converters 3 and 4. At the same time, the shading correction is performed. Signal extraction circuits 5 and 6 are composed of gates, and only the signal of the maximum document width is extracted. The signals from the signal extraction circuits 5 and 6 are color data (also referred to as color code data) represented by 2 bits in the color separation circuit 7 (first image processing means) and 6
It is separated into density data represented by bits. And
The color-separated image data is corrected in the main scanning color ghost correction circuit 8 for color ghost in the main scanning direction (horizontal scanning direction), and the next sub-scanning color ghost correction circuit 9 is provided.
In, the color ghost in the sub-scanning direction (the drum rotating direction of the electrostatic copying apparatus used as the printer) is corrected. These are for the purpose of improving the image quality by removing unnecessary color ghosts that occur in color separation, especially around black characters. 10 is an MTF correction circuit for correcting the resolution, 1
Reference numeral 1 denotes an area extraction circuit (second image processing means) for extracting an area designated in advance by a color marker on a color original. The color code and area signal of the area extracted here are color data selector 12 (third image processing unit). Image processing means). A color designation signal BBR and a process designation signal A are input to the color data selector 12, and a color designating a region and a process corresponding thereto are preset inside. That is, for example, if the color marker is red, enlargement / reduction processing, if it is yellow, trimming (only the image in the designated area is taken out) processing, if it is blue, masking (the image in the designated area is not taken in).
In this way, the marker color and the image processing function are preset in a one-to-one relationship. 13 is an EE circuit for automatic density setting, and 14 is a binarizing circuit. This binarizing circuit 14 binarizes the data output from the binarizing ROM 15 according to the threshold selection data or the data from the EE circuit 14. It is processed. 16 is an interface for a laser printer. Note that the one-to-one setting of the color of the color marker and the image processing function described above can be similarly set for density change, MTF correction, and the like.

〔The invention's effect〕

As described above, in the present invention, the color of the color marker and the image processing function are set in a one-to-one relationship, so that the operability is significantly improved.

Furthermore, in the conventional image processing apparatus, for example, a circuit that processes color information for each color of YMC is required, which is complicated and large-scale. However, according to the present invention, since it processes color data, Since one circuit can be used, there is a real advantage that the circuit scale can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a color image processing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of conventional image processing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Yamamoto Inventor Hiroyuki Yamamoto 2970 Ishikawa-cho, Hachioji-shi, Tokyo Within Konishi Rokusha Shin Kogyo Co., Ltd. Incorporated (72) Inventor Tetsuo Kimoto 2970 Ishikawa-cho, Hachioji-shi, Tokyo Inside Konishi Rokusha Shin Kogyo Co., Ltd. (56) Reference JP 59-163980 (JP, A) JP 57-202176 ( JP, A)

Claims (1)

[Claims] 1. An original color image signal of a color image in which a specific area portion is designated by a color marker is processed to separate one corresponding to one pixel into color data and density data, each of which is composed of a plurality of bits. For generating a color image signal to be reproduced
The image processing means, the second image processing means for processing the color data to detect the area of the color marker, and the color of the color marker and the image processing function are preset in a one-to-one relationship. A color image processing device, comprising: third image processing means for performing image processing according to the color of the color marker on an image inside or outside the area of the color marker detected by the image processing means.