JPH04205277A - Image processor - Google Patents

Abstract

PURPOSE:To more exactly decide a specific original by providing a means for changing over the parameter of a signal processing circuit for deciding the specific original. CONSTITUTION:A CPU 201 identifies the kinds of input means 101, 104, 105 inputted with image data and determines the image decision processing method from plural kinds of the image decision processing methods in accordance with the identified kind. A specific original deciding circuit 205 decides the identity of the image data inputted according to the determined image decision processing method and the specific image. The data for deciding the specific original is changed over to the data for decision suitable for the input device in this way. The specific original is more exactly decided in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image processing apparatus, and more particularly to an image processing apparatus that can be applied to a copying machine or the like provided with a function of detecting a specific original.

[Prior Art] In recent years, with the increase in image quality and colorization of copying machines, there has been a fear that specific documents such as banknotes and securities may be forged. A pattern matching method has been proposed that compares the shapes of specific images. In this method, in order to determine whether a document placed at an arbitrary position on the document table is a specific document, the position and angle at which the document is placed are calculated, and then pattern matching is performed.

[Problems to be Solved by the Invention] However, in the conventional example described above, the reading unit is only a scanner. For example, when a plurality of input devices such as film scanners and still video cameras are connected, there is a drawback that a specific document cannot be accurately determined due to differences in input sensor conditions.

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 that can more accurately identify a specific document.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the objectives, an image processing device according to the present invention includes a plurality of types of input means for inputting image data. an identification means for identifying the type of the input means into which image data has been input; a determining means for determining an image judgment processing method from a plurality of types of image judgment processing methods based on the type identified by the identification means; The present invention is characterized by comprising a determining means for determining the identity of image data input from the input device of the type identified by the identifying means and a specific image according to the determined image determining processing method.

[Operation] According to this configuration, the identification means identifies the type of input means that inputs the image data, and the determination means selects an image judgment processing method from a plurality of types of image judgment processing methods based on the type identified by the identification means. The determination means determines whether the image data input from the type of input device identified by the identification means and the specific image are identical in accordance with the image determination processing method determined by the determination means.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First Embodiment) <Apparatus External View> FIG. 1 is an external view showing a first example of a copying machine to which an image processing apparatus according to the present invention is applied.

In FIG. 1, 100 is a laser color copying machine, 101 is a scanner (reading section) of the laser color copying machine, and 102 is a color printer. Reference numeral 103 denotes an image processing device (hereinafter referred to as I) to which multiple types of input devices are connected.
104 is a still video camera (referred to as PU).
(hereinafter referred to as Sv), and 105 is a film scanner that reads, for example, 35m film.

<Signal processing block diagram of IPtJ103> Figure 2 shows the IP
It is a block diagram showing the signal processing configuration of U103. In the figure, a CPU 201 that is a system controller communicates with scanners 101, 5V 104, etc., and
Controls U103. The selector 202 is a selector that selects image data from an input device based on the value of the input device selection signal DSL205. The image memory 203 is an image memory that stores input image data, and the print signal generation circuit 204 is a circuit that generates print color signals for performing masking and UCR calculations. The specific original determination circuit 205 identifies a specific original from the RGB signals,
410 is an OR circuit that generates the judgment signal H310.
This is a gate circuit, which logically ORs each of the 8-bit outputs V of the print signal generation circuit 204 with a judgment signal H, which is an output of a judgment means to be described later, and outputs V'.

As a result, when the determination signal H is "1", that is,
If it is determined that the specific document has been read, the output will be V' = FF, EX, regardless of the value of the input signal ■.
(255), and when the judgment signal H=O, that is,
If it is determined that the specific document has not been read, the value of the input signal V is output as is as the output signal V'.

Here, 201a is the ninth node for the CPU 201 to operate.
RO that stores programs etc. that follow the flowchart in the figure.
201b is a RAM used as a work area for the program stored in the ROM 201a.

Here, the main operations of the CPU 201 will be explained.

FIG. 9 is a flowchart illustrating the procedure for generating the DSL signal 305, and FIG. 6 is a diagram illustrating the correspondence between DSL signals and device names.

First, when the CPU 201 accepts an output request for RGB signals from an input device (step Sl), the CPU 201 outputs an RGB signal to the scanner 101.
．． 5V 104 and the film scanner 105 from which the request came (step S2). Then CPU20
Step S3) creates a DSL signal 305 indicating the scanner 101.5V104 or the film scanner 105 according to the identification result.
05 is simultaneously output to the selector 202, the print signal generation circuit 204, and the specific document determination circuit 205 (step S4). According to FIG. 6, in the case of the scanner 101, the DSL signal 305 is "0";
In this case, the DSL signal 305 is "1", and in the case of 5V104, the DSL signal 305 is "2". After this,
The CPU 201 allows the input device identified in step S2 to output RGB signals (step S5).

Determination Means> FIG. 3 is a block diagram showing the configuration of the specific original determination circuit 205. In the figure, 302 is a color matching lookup table read-only memory (rROMJ).
), and performs color matching with a specific original. The color distribution of a specific document under each condition of a plurality of input devices is checked in advance, and the determination result of whether the color of the pixel matches the color of the specific document is stored. That is, in the ROM 302, the DSL signal 305, which is an input device selection signal, is in the upper 2 bits of the address, and the lower 1 bit is in the ROM 302.
The upper 5 bits of the image signals of each color of RGB are input to the 5 bits. The value of the input device selection signal 205 is 0~
2, whether or not the color of the pixel matches the color of the specific original is output in correspondence with 8-bit data, and a determination is made regarding the specific original that corresponds to the input conditions of the input device. .

303 is a tint judgment circuit, which includes an integrator 306 and a register 307. It is composed of a comparator 308 and determines whether a specific document exists in the document.

<Configuration of Judgment ROM 302> FIG. 4 shows the distribution of image data of each input device in R, G, B space and the judgment ROM 30 when a specific original is input.
2 is a diagram showing the relationship with 2.

In FIG. 4, the determination ROM 302 is configured so that 1 is output when R, G, and B signals matching the shaded area are input, and 0 is output otherwise.

<Integrator> FIG. 5 is a block diagram showing the configuration of integrator 306.

In the figure, 501 and 505 are flip-flops that hold data at the rising timing of the CLK signal. CLK is a clock signal synchronized with pixels.

502 is a multiplier that converts 8-bit two-way signals (A, B
), and the multiplication result is an 8-bit signal (AXB/
255) is output. 503 is also a multiplier, which inputs a 1-bit input signal (A) and an 8-bit input signal (B), and outputs an 8-bit output signal (AXB) as a multiplication result.

504 is an adder that receives two 8-bit signals (A, B
), and the addition result is an 8-bit signal (A+B).
Output.

As a result, in this integrator, the 8-bit output signal y for the binary input signal x1 is calculated by the following formula (% formula %... (1) where α and β are preset constants. and
The magnitude of these values determines the characteristics of the integrator.

FIGS. 7A and 7B are diagrams illustrating input and output of the integrator 306.

For example, α=247. In the case of β=8, an example of a large pressure of the present integrator is shown in FIG. That is, in response to an input Xl-+ as shown in FIG. 7A, a $power yl as shown in FIG. 7B is output.

Here, there are inputs such as input x, -1 shown at 701 and 702, which are "l" even though the surroundings are mostly "0", and input x1-1, shown at 703. An input that is "0" even though the surrounding areas are "1"' is considered to be noise. Process this with an integrator, set an appropriate threshold value as shown in 704 in the register 307 in Figure 3, and use this to binarize the output yI of the integrator to remove noise. can do.

Processing Results> FIG. 8 is a diagram showing an example of processing results according to the first embodiment. In FIG. 8, 801 is an original, and 803 is a specific original that should be determined in this apparatus as part of an image. 802 is the output result when the original 801 is copied by this apparatus, and 804 is a portion corresponding to the specific original 803, which is a hidden portion that is painted out.

In the first embodiment, when a document 801 is read, the determination means corresponding to the input device determines that the specific document 803 is a specific document based on the color components of the read image. Corresponding hidden part 8
04 as the output result 802, and the copying is completed.

As explained above, according to the first embodiment, data for determining a specific document can be switched to determination data suitable for the input device in a copying machine to which a plurality of input devices are connected. Accordingly, it is possible to more accurately identify a specific document.

Second Embodiment> FIG. 10 shows a specific document determination circuit 20 according to a second embodiment.
5 is a block diagram showing the configuration of No. 5. FIG.

In the second embodiment, the threshold value 704 in FIG. 7B is selected based on the value of the input device selection signal DSL205.

By reducing the value of the threshold value 704, it is possible to increase the detection output for a specific document.

In this embodiment, the input devices are scanners 101 and 5V104.
．． There are three types of film scanner 105, 5V10
4 is inferior to the other two devices in terms of resolution. Therefore, the output of the counterfeit product is inferior to the other two input devices and is less likely to be used for counterfeiting. Therefore, the value of threshold 704 is
It may be larger than the other two input devices.

In FIG. 10, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. 303° is a tint determination circuit of the second embodiment. This color judgment circuit 303
901 stores the threshold value corresponding to the scanner 101, 902 stores the threshold value corresponding to the film scanner 105, and 903 stores the threshold value corresponding to the scanner 105.
The threshold value corresponding to is stored.

Selector 904 selects and outputs one of the values of registers 901 to 903 in accordance with the value of input device selection signal DSL205. Thereby, the detection level of a specific document can be made variable in accordance with the performance of the input device.

[Effects of the Invention] As explained above, according to the present invention, in an image processing apparatus to which a plurality of input devices are connected, by providing means for switching the parameters of the signal processing circuit for determining a specific original, Accurate identification of specific documents can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an external view showing a first embodiment of a copying machine to which an image processing apparatus according to the present invention is applied, FIG. 2 is a block diagram showing the signal processing configuration of the IPU 103, and FIG. 3 is a specific document determination circuit 205. FIG. 4 is a block diagram showing the configuration of the image data of each input device when a specific original is input, and the distribution in R, G, B space and the judgment ROM 30.
2, FIG. 5 is a block diagram showing the configuration of the integrator 306, FIG. 6 is a diagram explaining the correspondence between DSL signals and device names, and FIGS. 7A and 7B are the integrator 8 is a diagram illustrating an example of the processing result according to the first embodiment, FIG. 9 is a flowchart illustrating the procedure for generating the DSL signal 305, and FIG. 10 is a diagram illustrating the second embodiment. Specific manuscript determination circuit 20 regarding the example
5 is a block diagram showing the configuration of No. 5. FIG. In the figure, 100... laser color copy machine, 101...
...Scanner, 102...Color printer, 103.
...IPU, 104...S■, 105...Film scanner, 201-CPU, 201a・ROM, 20
1b...RAM, 202...Selector, 203...
・Image memory, 204...Print signal generation circuit, 2
05... Specific document judgment circuit, 410... OR gate circuit, 302... ROM, 303... Color tone judgment circuit, 306... Integrator, 307... Register, 308
... Comparator, 501.505 ... Flip-flop, 502, 503 ... Multiplier, 504 ... Adder,
801... Original, 802... Output result, 803...
-Specific manuscript, 804...This is a hidden portion.

Claims (3)

[Claims] (1) In an image processing apparatus having a plurality of types of input means for inputting image data, an identification means for identifying the type of the input means into which the image data is input, and a plurality of types based on the type identified by the identification means. determining means for determining an image determination processing method from a type of image determination processing method; and image data input from the input device of the type identified by the identifying means according to the image determination processing method determined by the determining means, and a specific image. an image processing apparatus comprising: determination means for determining the identity of the image processing apparatus. (2) The image processing apparatus according to claim 1, wherein the image data is color component data. (3) The image processing apparatus according to claim 1, wherein each of the image determination processing methods corresponds to one of the image input means.