JPH0678144A - Picture processor - Google Patents

Abstract

PURPOSE:To reduce the degradation of a picture due to printing of the machine body number, the copy date, or the like. CONSTITUTION:A Fourier transform circuit 105, a filter 106, a Fourier inverse transform circuit 107, a picture processing circuit 108, and a picture memory 110 extract the high frequency component based on color picture data inputted from a scanner 101. An add-on circuit 103 synthesizes inputted color picture data and color picture data indicating the copying machine body number and the copy time in the area of the extracted high frequency component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus, for example, an image processing apparatus having a function of detecting a specific original.

[0002]

2. Description of the Related Art In recent years, color copiers have increased their sharpness and fidelity, and at first glance it is becoming difficult to distinguish between a document and a copied image. In addition, counterfeit crimes such as securities and banknotes using such high-performance color copying machines have begun to increase. Due to such problems, a system has been proposed in which copying is stopped when a securities bill is detected.

Further, by printing an image such as the machine number of the copying machine and the date and time of copying by using a color that is inconspicuous to all the copied images, for example, yellow, if it is illegally forged, it is printed. By identifying the machine number that is present, the copier used for forgery can be identified, and it will be useful for arresting criminals.

[0004]

However, in the above-mentioned conventional example, image deterioration is unavoidable because printing is performed on a copied image in a random manner. The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and an object thereof is to provide an image processing apparatus capable of reducing image deterioration caused by printing an image such as a machine number and a copy date and time. In point.

[0005]

[Means for Solving the Problems]
In order to achieve the object, an image processing apparatus according to the present invention is an extraction unit that extracts a high frequency component region based on input color image data, and the input color in the region extracted by the extraction unit. A synthesizing unit for synthesizing the image data and the predetermined color image data is provided.

[0006]

According to this structure, the extracting means extracts the high frequency component region based on the input color image data,
The synthesizing means, in the area extracted by the extracting means,
The input color image data and the predetermined color image data are combined.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiments, an example of a copying machine is shown as an application example of the present invention, but the present invention is not limited to this, and it goes without saying that it can be applied to various other apparatuses. In addition, each device to which the present invention can be applied is
To prevent counterfeiting, specific documents such as banknotes and securities are made symmetrical. <First Embodiment> FIG. 1 is a block diagram showing the internal structure of a copying machine according to the first embodiment of the present invention. In the figure, 101 is a scanner, the details of which are shown in FIG.
Reference numeral 102 denotes an image editing processing circuit, which performs black correction and white correction of a read color image, and logarithmic conversion for matching with human visual characteristics, that is, conversion of RGB image signals into magenta, cyan, and yellow, and a printer. 104
Image editing processing for faithfully reproducing the read image is performed, such as masking and UCR calculation processing according to the color reproduction characteristics of A printer 104 reproduces an image based on color signals obtained from the image editing processing circuit 102. At this time, the image data is developed in the order of magenta, cyan, yellow, and black (hereinafter referred to as M, C, Y, and Bk). An add-on circuit 103 is a circuit that prints a machine number, a print date, and the like on a print image under the control of the image memory 110 to prevent forgery. The operation performed by the add-on circuit 103, that is, printing is hereinafter referred to as an add-on.

Reference numeral 105 is a Fourier transform circuit, 106 is a filter, 107 is a Fourier inverse transform circuit, 108 is an image processing circuit, 109 is a CPU for controlling the entire apparatus, and 110 is an image memory. FIG. 2 is a configuration diagram showing the appearance of the scan scanner 101 according to the first embodiment. In the figure, 20
Reference numeral 1 denotes a CCD color line sensor, which scans a document 203 (shown through in the figure for the sake of clarity) placed on a document table 202 in the direction of arrow X, and outputs color image data for one line in red and green. ， Separated into blue and
It is being read (hereinafter referred to as R, G, and B, respectively).
Further, although not shown, the next line is read by moving the CCD line sensor 201 in the arrow Y direction by mechanical means. By repeating the above operation, the entire area of the document is read.

FIG. 3 shows an add-on circuit 1 according to the first embodiment.
It is a block diagram which shows the structure of 03. In the figure, 3
01 is an add-on signal generation circuit, 302 is a color signal, 303
Is an image signal, 304 is an add-on trigger signal, 305 is a combining circuit, and 306 is an add-on output. Next, the operation of the above configuration will be described.

The add-on signal generating circuit 301 is a circuit for generating add-on data of a copying machine number and a copying date and time by a trigger signal of the add-on trigger signal 304,
The add-on signal generated here is added to the image signal 303 from the image editing processing circuit 102 by the synthesizing circuit 305 and transferred to the printer 104. FIG. 4 is a timing chart when the add-on is performed by the add-on trigger signal 304 according to the first embodiment.

At the rising edge (1) of the add-on trigger signal 304, it is input to the add-on signal generation circuit 301 as an add-on possible area. Further, as the end of the add-on area, Low level (2) is detected, and the add-on signal generation circuit 301 stops the generation of the add-on signal and ends the add-on. As shown in FIG. 2, the add-on data is formed by arranging dot pixels forming an image according to a certain rule regardless of the image, and has a structure such as a Morse code.

In this embodiment, information is represented by the distance a between two points. While the add-on trigger signal is at the high level, add-ons such as the copying machine number and the copy date / time are repeatedly performed. After detecting the low level (2), a series of information is added and the process is terminated. In this way, since the add-on is performed regardless of the image signal, it is conspicuous in a smooth image area, which causes image deterioration.

However, the add-on data can be made inconspicuous and the image deterioration can be prevented by adding the add-on to the high frequency region, that is, the complicated image region as in the present embodiment. The color signal 302 input to the add-on signal generation circuit 301 is the printer 10
4 is a 2-bit signal indicating the color being developed. For example, when developing magenta (0, 0), when developing cyan (0, 1), when developing yellow. Is (1,0), and (1,1) is input when developing black. Add-on signal generation circuit 30
1 detects this signal and generates an add-on signal only for the yellow signal.

The add-on trigger signal is a signal obtained from information obtained by Fourier transforming image data, and an add-on trigger signal is created by performing a prescan when obtaining an image. The details will be described below.
The image data read line by line by the CCD line sensor 201 shown in FIG.
The Fourier transform is performed for each line read by.
The filter 106 extracts a necessary spectrum from the Fourier spectrum obtained from the Fourier transform circuit 105. The inverse Fourier transform circuit 107 performs an inverse Fourier transform of the Fourier spectrum that has passed through the filter 106,
An image including only an image region having a high frequency is reproduced.
The image subjected to the inverse Fourier transform is subjected to smoothing and binarization processing in the image processing circuit 108 in order to clarify the region, and is stored in the image memory 110 as a high frequency region signal, that is, an add-on trigger signal.

After the above processing, a main scan is performed, and the image area signal is read from the image memory in synchronization with the main scan.
Add-on is performed by the add-on circuit 103 based on this signal. As described above, according to the first embodiment, a high frequency area is extracted from the information obtained by Fourier transforming the read image, and the copy machine body number and the copy date and time are added to the area. Data can be made inconspicuous and image deterioration can be prevented. Second Embodiment Now, in the first embodiment described above, the add-on area is extracted in the image memory 110 by performing the prescan, but if the fast Fourier transform is used, the prescan is not performed and the main scan is performed. A high frequency region can be extracted while performing, and a high-speed image output can be obtained in real time, with the same effect.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0017]

As described above, according to the present invention, it is possible to prevent image deterioration even if information for identifying a copying machine is added to the output color image.

[Brief description of drawings]

FIG. 1 is a block diagram showing an internal configuration of a copying machine according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing an appearance of the scanner 101 according to the first embodiment.

FIG. 3 is a block diagram showing the configuration of an add-on circuit 103 according to the first embodiment.

FIG. 4 is an add-on trigger signal 304 according to the first embodiment.
This is a timing chart when an add-on is performed by.

[Explanation of symbols]

 101 Scanner 102 Image Editing Processing Circuit 103 Add-on Circuit 104 Printer 105 Fourier Transform Circuit 106 Filter 107 Fourier Inverse Transform Circuit 108 Image Processing Circuit 109 CPU 110 Image Memory 201 CCD Color Line Sensor 202 Document Plate 203 Document

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Claims (3)

[Claims] 1. Extraction means for extracting a high frequency component area based on input color image data, and the input color image data and predetermined color image data in the area extracted by the extraction means. An image processing apparatus comprising: a synthesizing unit that performs synthesizing. 2. Extraction means for extracting a high-frequency component area based on the input color image data, and the input color image data and predetermined color image data in the area extracted by the extraction means. An image processing apparatus comprising: a synthesizing unit for synthesizing and a recording unit for recording a color image based on the color image data obtained by the synthesizing unit. 3. The image processing apparatus according to claim 1, wherein the extracting means uses a fast Fourier transform.