JPS6154576A - Detecting system for changing point of area designation enable picture - Google Patents

Abstract

PURPOSE:To recognize patterns at a high speed by writing previously mask data of a free form to an area designation memory corresponding to a picture to be processed for each picture element and detecting the change in brightness of the picture only in the range of said free form. CONSTITUTION:For an area designation memory 24, ''1'' is written previously on a point corresponding to the picture element to be processed and then read out simultaneously with a picture memory 9. A changing point detecting circuit 14 uses an exclusive logical circuit 39 for adjacent data to extract the changing point via a latch 38 for data read out of the memory 9. At the same time, the circuit 14 uses an AND circuit 40 to transmit only the changing point of a processing area from the memory 24 by means of the mask data. Furthermore, the information on the changing point can be stored in the form of the 2-dimensional data by the lowest data 5 of the vertical address data of a picture address generating circuit 7.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for detecting a change point in an image in an image processing device, and in particular, to a method for detecting a change point in an image. The present invention relates to a change inspection method suitable for detecting change points in images.

[Background of the invention]

Conventionally, pattern recognition processing using changing points in images is
As described in Japanese Patent Application Laid-Open No. 59-47674, it is known that data is compressed to improve recognition efficiency when used in character recognition. is not clear, and the entire screen is targeted for VL detection of changing points.

Therefore, in pattern recognition, when detecting a change point in an object for which the area to be recognized can be limited in advance, unnecessary data may be input, making it difficult to perform a more effective pattern recognition process. There were problems such as not being able to.

[Purpose of the invention]

It is an object of the present invention to eliminate the above-mentioned problems, to set a mask area in a free shape for a pattern recognition target image, to detect change points within the masked area, and to reduce the amount of data required for pattern recognition RtiC. However, it is an object of the present invention to provide a method for detecting a change point in an image in which a region can be specified, and which can shorten the recognition time.

[Summary of the invention]

In order to achieve the above object, the present invention provides two image memories that are synchronous with centimeter drive signals of a TV camera, etc., one of which is used for image input and image processing,
The other image memory is for mask area settings, tabs,
Add '1' to the part of the input image where you want to perform image processing.
Or, set with 10'' contradictory logic signals, draw a free-form pattern with one logic as a processing area and the other logic as a non-processing area, and use it for image processing. Then, these images The memory shall have a circuit configuration that allows reading and writing from the outside independently.This external reading/writing may be asynchronous with the drive signal such as the centimeter (this button), etc. Based on mask area data prepared in advance, changes in image brightness are detected in one or two dimensions for an input image or an image from image memory, and a predetermined change is detected. The pattern recognition is performed at high speed by detecting the portion where the image is held as a change point, and by using the mask area setting effect and the compression of image data using the change point data.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 1, FIG. 2, and FIG. 3.

The circuit shown in FIG. 1 includes N converters 2, image memory 9, area specification memory 24, change point detection circuit 14, change point data write signal generation circuit 37, and change point memory 3.
3 has a circuit configuration that operates in synchronization with the address signal of the image address generation circuit 7.

First, a sensor f (not shown) of a TV camera or the like is driven using drive signals 46 and 47 outputted from the image address generation circuit 7. The electrical signal of the image pattern obtained by Senna (
Analog signal) 1 is number 9 synchronized with the least significant bit of image address data 6 from image address generation circuit 7.
(by A/D converter 2),
It is converted into a 9-bit digital signal 6.

In order to treat the digitally converted signal 5 as two-dimensional image data, the image address generation circuit 7 generates a horizontal pixel address 64 (L bit) and a vertical pixel address 64 (j pit). The pixel division 2'' and the vertical pixel division 2j allow it to be handled as a two-dimensional image of (2'' x 2/) pixels, and all signals output from the image address generation circuit 7 are synchronized.

Then, the address data 6 output from the image address generation circuit 7 is passed through the Ih image memory address switching circuit 8.
The image memory 9 is accessed, and the digital input signal 3 is inputted as image data by -47J into the image memory 9 through the data switching circuit 12, and read out. At this time, the area designation memory 24 is also read out in synchronization with the image memory 9 according to the address data 6. Here, the reason why the image address data 6 passes through the image memory address switching circuit 8 and the 1g data 3 passes through the data switching circuit 12 is because the contents of the artist memory 9 are read and written by m (CPU) after processing. This is because they are too busy trying to stay busy. Even in the open bank area memory 24,
An area specifying memory address switching circuit 25 and a data switching circuit 21 are provided.

By doing so, the image memory 9 and the area designation memory 24 will operate in synchronization. however,
Both memories 9 and 24 are connected to the external address circuit 51, fi, and C.
When accessed from the PU 36, the synchronization relationship with the image address generation circuit 7 is irrelevant and may be ignored.

The image memory 9 is used for temporarily storing input signals and for storing CP
It can be used to add processing from the U36 side and output the processed image in synchronization with the image address signal 6, or to output temporarily stored data as is. Further, when the area designation memory 24 operates in synchronization with the image address data 6, it operates only for reading, and when accessed from outside by the CPO 36 or the like, it is readable and writable. However, it is of course possible to make it writable in synchronization with the image address signal 6 to increase the versatility of use. Then, as the contents of the area specification memory 24, a signal of logic level 11 &' or 10'' is written as a signal of 1 pixel and 1 pit.This logic data is 2L x 27
It corresponds to the image memory 9. Therefore, the content of the area designation memory 24 corresponding to the address of the image memory 9 makes the image data of one logic level (in this case, logic level 11'') valid, and the image data of the other logic level. The contents of the area designation memory 24 are used to invalidate the image data.In other words, the image data is masked.

Next, one of the input digital image data 3 is selected by the data switching circuit 12 according to the switching signal 20 of the external setting circuit 32.

The selected signal 13 is then input to the change point detection circuit 14. At the same time, the mask data 22 read from the area designation memory 24 is also selected by the data switching circuit 21 and input to the change point detection circuit 14. Based on the brightness change of the image data 16, the change point detection circuit 14 performs an operation to set a predetermined portion with a brightness change as a change point, and only when the contents of the mask data 18 are at the logic level 11''. Then, the lowest data 51C of the vertical address data of the artist address generation circuit 7 is stored as two-dimensional data, and the change point information is set to 5. Then, the change check is performed. According to the change point information detected by the output circuit 14, the change point detection circuit 14 generates a change point memory address 16 for inputting the change point information in the change point memory 33, and detects a vertical change indicating a change in the vertical direction. A signal 15 for generating data 17 and writing the data into the changing point memory 33 is output to the changing point data write signal generation circuit 37.

The change point data write signal generation circuit 37 outputs a write pulse 34 for writing change point information to the change point memory 33 to the change point memory 35.

Here, the change point memory 33 stores the horizontal address 29 and the change value of the image data 13 in the case of a signal change in the water direction, and stores only the vertical change in the case of a vertical change. By doing so, it is possible to accurately store image change point data with the smallest amount of data.

Next, a change point detection method using mask data will be explained with reference to FIGS. 2 and 3.

In addition, in FIG. 2, 5611C, the same parts as in FIG. 1 are given the same reference numerals.

As shown in FIG. 2, the image data 13 (in this case, binary data will be explained) inputted through the data switching circuit 12 is held in the memory 8 for a single access period. Then, by using the logical sum 39, a change point signal 43 of the image is obtained as shown in FIG. Then, the gate circuit 40 outputs logic level 1 according to the blank data 18.
Data 44 after mask processing is obtained by validating only the case of 1°. As a result, the change point data of the portion where the mask data 18, which becomes the mask area, becomes 10''' is removed.Then, the next OR circuit 41 adds i-orthogonalization information 5, and 2 Data 45 is obtained as change point information while maintaining dimensional information, and change point counter 4
2 is input. The subsequent circuit operation is the same as that shown in FIG.

As described above, according to this embodiment, the area specification memory 24
By writing free-form mask data into the image, the change point data of the image according to the mask data can be detected efficiently, which speeds up the recognition speed when pattern recognition is performed using the change point data. By reducing the amount of change point information, it is possible to reduce the number of erroneous recognitions.

〔Effect of the invention〕

According to the present invention, masking of busy image processing areas can be performed in real time, and recognition time can be shortened. In addition, since the changing point data of the image according to the mask data can be detected efficiently, when recognizing a pattern based on the changing point data, the gR speed is improved and the changing point data is reduced. It also has the effect of preventing recognition.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circuit information generation process showing one embodiment of the present invention, FIG. 2 is a diagram showing details of the change point detection circuit in FIG. 1, and FIG. 3 is a change inspection diagram in FIG. 2. This is a timing chart. DESCRIPTION OF SYMBOLS 1... Input signal, 2... A/D converter, 3... Digital image signal, 7... Image address generation circuit, 8...
... Familiar memory address switching circuit, 9... Image memory, 12... Data switching circuit, 14... Ashing point detection circuit, 21... Data switching circuit, 24... Area specification memory. 25...Area specification memory address switching circuit, external address setting circuit 31, external setting circuit 32, 53...
- Change point data write signal generation circuit.

Claims (1)

[Claims] In an image processing device that captures and analyzes images, an area specification memory corresponding to the image to be processed pixel by pixel is provided, and data can be freely written to the area specification memory at a logical level. For the processing target image corresponding to the address, when the brightness of the image exceeds a predetermined value between adjacent pixels, it is determined as a change point, and the area is read out from the area specification memory in synchronization with the change point detection process. A method for detecting a change point in an image capable of specifying an area, characterized in that when one logic of specified data is detected as a change point in the image.