JPS63286067A - Color picture processing device - Google Patents

Abstract

PURPOSE:To attain convenient picture processing by selecting the mode applying the processing of the entire original picture face and the mode applying the picture processing of the inside/outside of the specific area in the stage after color separation and before binarization. CONSTITUTION:A color data selector 12 uses a color designation signal BBR and a processing designation signal A so as to select which color is to be used for the extracted area, whether the outside of the area is to be extracted or a conventional processing is applied without using a signal from an area extraction circuit 11. That is, the modes are roughly classified into the mode applying the processing of the picture at the entire original picture face and the mode applying the picture processing in the inside or outside of the specific area of the said original, and in the latter mode, expansion, reduction, density change, trimming or masking is selected. A binarization circuit 14 uses a threshold value selection data to apply binarization processing based on a data outputted from a binarizing ROM 15 or a data from an EE circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus that reads a color image of a document and performs image processing.

[Conventional technology]

2. Description of the Related Art Japanese Patent Laid-Open Nos. 57-147374 and 1982-62769 are known as apparatuses that image a document, separate it into colors such as black, red, and blue, and then make copies. These are the second
As shown in the figure, image sensors 21 and 22 such as COD
The analog signal obtained in is operated by an operational amplifier 23 and AGC circuits 24 to 26, binarized by binarization circuits 27 to 29, and the binarized data is computed by an arithmetic circuit 30 to perform color separation. Is going. Therefore, in such a device, processing of image data (for example, MTF correction, enlargement/
When attempting to perform processing (reduction, gamma correction, etc.), it must be performed on the analog image signal group before color separation, or on the binarized image data group after color separation, which can only be partially processed. There are only two things you can do.

However, in the former case, multiple circuits are required, and processing is difficult because analog signals are used. On the other hand, in the latter case, although processing such as enlargement and reduction is possible, the possible processing is limited by the fact that it is binary image data, and it is difficult to obtain high image quality.

Additionally, it has been known that unnecessary colors exist in image data after color separation, which causes image quality deterioration.
The method for removing these unnecessary colors is based on color-separated binary information. Therefore, in the conventional color separation method, it is very difficult to perform image processing after color separation.

If processing is performed before color separation, various dispersion factors will be affected by each process, making color separation difficult or removing unnecessary colors.

Therefore, in order to solve the above-mentioned drawbacks, a method has been proposed in which, instead of performing color separation after binarization, color separation is performed as is in multi-valued 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 it possible to distinguish between processing related to a specific area and normal processing other than that.

[Examples] Examples of the present invention will be described below. FIG. 1 is a diagram showing one embodiment thereof. The color image information (optical image) of the original is separated into two colors (red and cyan) by a dichroic ink mirror and read by CCD1.2.
Each of them undergoes shading correction simultaneously with A/D conversion processing by the A/D converter 3.4. 5.6 is a signal extraction circuit consisting of a gate, which extracts only the signal of the maximum document width. The signal from the signal extraction circuit 5.6 is separated by a color separation circuit 7 into color coat data represented by 2 points and density data represented by 6 bits. The color-separated image data is corrected for color ghosts in the main scanning direction (horizontal scanning direction) in the main scanning color ghost correction circuit 8, and then in the sub-scanning direction (horizontal scanning direction) in the next sub-scanning color ghost correction circuit 9. Color ghosting in the direction of drum rotation of the electrostatographic reproduction device is corrected. These are intended to improve image quality by removing unnecessary color ghosts that occur during color separation, especially around black characters.

10 is an MTF correction circuit that corrects the resolution; 11 is an area extraction circuit that extracts an area specified in advance by a marker on a color original; the color code and area signal of the area extracted here are sent to the color pig selector 12; input. This color data selector 12 determines what color the extracted area should be, based on the color designation signal BBR and the processing designation signal A.
Alternatively, a process is selected to extract the area outside the area or to perform normal processing without using the signal from the area extracting circuit 11. That is, either a mode in which image processing is performed on the entire document image or a mode in which image processing is performed within or outside a specific area of the document is roughly selected, and further enlargement, reduction, and density changes are performed within the latter mode. , cropping, and masking are selected. 13 is an EE circuit for automatic density setting, and 14 is a binarization circuit. This binarization circuit 14 converts the data output from the binarization ROM 15 or the data from the EE circuit 14 into binary values according to the dark value selection data. processed.

16 is an interface for a laser printer.

〔Effect of the invention〕

As described above, in the present invention, at the stage after color separation and before binarization, the mode for processing the entire original image and the mode for processing within a specific area are set.
Since you can select a mode that performs other image processing, convenient image processing can be performed.

[Brief explanation 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. Representative Patent Attorney Tsuneaki Nagao Procedural Amendment (λ Rejected August 6, 1986 Kunio Ogawa, Commissioner of the Patent Office 1, Indication of Case Patent Application No. 121737, 1988 2, Name of Invention Color Image Processing Device 3: Relationship with the case of the person making the amendment Patent applicant address: 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo
Name (127) Konishiroku Photo Industry Co., Ltd. 40
Agent 6, Number of inventions increased by amendment None 7, Subject of amendment Drawings

Claims (1)

[Claims] (1) In a device that captures a color image and performs image processing, there is a mode in which the image is processed on the entire surface of the document image after color separation of the document image, and a mode in which the image is processed on the entire surface of the document image, and a mode in which a specific area of the document is detected and the area is 1. A color image processing apparatus, comprising a mode for performing image processing inside or outside the image processing apparatus, and a mode selection means for selecting the two modes.