JPH0736199B2 - Digital image data comparison device - Google Patents

Description

The present invention relates to a digital image-to-image data comparison device for processing image data obtained by converting a video signal into a digital amount by an AD converter or the like.

"Prior Art" A conventional general image processing apparatus is as shown in FIG. In this image processing apparatus, an image to be compared is stored in the image memory I and the image memory II, and is output from the image memory I and the image memory II, and the image comparator (CP
U) is used for comparison calculation. A logic circuit may be used instead of the image comparator.

[Problems to be Solved by the Invention] In the conventional image processing apparatus as described above, the image memory I and the image memory II are output while the image memory I and the image memory II are outputting and the calculation is performed by the image comparator. However, images cannot be captured and continuous images cannot be processed. By increasing the calculation speed of the image processing apparatus as a whole, continuous images can be processed, but the image processing apparatus becomes complicated, and the scale and cost increase.

[Means and Actions for Solving the Problems] In view of the above circumstances, the present invention provides a digital method for increasing the operation speed and enabling the processing of continuous images without increasing the size of the image processing apparatus. In the image processing, a memory configuration capable of reading and writing image data at the same time (within one pixel transfer time) and a comparison calculation table memory are provided, and the input image data is written into the image memory and at the same time compared. By controlling the calculation table memory with the desired image data stored in the image memory and the input image data, the required result image is continuously output from the comparison calculation table memory between digital images. It is a data comparison device.

"Example" The present invention will be described in detail below based on an example.

As an embodiment of the present invention, FIG. 1 shows a digital inter-image data comparison apparatus for processing 8-bit image data of 512 × 512 pixels. In the present invention, the look-up table memory is used as the image comparator, and as the initial setting, the comparison result image data to be output corresponding to the input image is assumed and written in the table memory. Next, the target comparison result image data is obtained by controlling the address line of the table memory using the two image data to be compared.

The image memory 1 is an 8-bit image memory of 512 x 512 pixels, where the storage location is set corresponding to the position of the pixel on the screen.
The image memory used for writing and reading is set independently from the system control bus, and is input to the comparison calculation table memory from any image memory. The stored image data corresponding to the pixel position of the image data to be output can be output, and at the same time, the input image data can be written to an arbitrary image memory. When there is only one image memory, or when the image memories used for reading and writing are the same, the data corresponding to the pixel position of the input image data is read and then the input data is written at the same position. More specifically,
The image memory I and the image memories II to N function independently. For example, it is possible to read the image data stored in advance from the image memory II while writing the data in the image memory 1. When only the image memory I is used alone, the read modify write is performed immediately after the read operation and the write operation is performed at the same position, so that the new image data can be written while reading the previous image data. It is possible. This means that reading and writing can be performed within the time for transferring one pixel.

The image memory structure of the present invention means not only an image memory but also an image memory circuit.

The comparison calculation table memory has a total of 16 bits of lower 8 bits and upper 8 bits to handle 8 bits of image data, and the lower 8 bits address line is a data line from the input image data and the upper 8 bits. Address line is connected to the output data line of the image memory.
From this, the output data of the comparison calculation table memory is
The selected image is output corresponding to the information of the input image and the information from the image memory. Therefore, if the comparison result information is written in the table memory in advance, an output corresponding to the image information can be obtained.

The table look-up memory is a memory used to retrieve target data from a data line by writing a table look-up table in the memory and controlling an address line of the memory. until now,
Although the result was calculated by a logic circuit, due to recent increase in memory capacity and cost reduction, this table look
Up memory has come into use. Compared with the logic circuit, the circuit configuration can be simplified, and the RAM can be used as the memory to provide flexibility.

The image memory and table memory for comparison calculation are each connected to the system control bus, and control read / write to the memory, address control for the image memory, write of input image data to the image memory, write prohibition, selection of the image memory, etc. To be done.

"Effect of the Invention" The present invention, as described above, in digital image processing,
An image memory configuration capable of reading and writing image data at the same time (within one pixel transfer time) and a comparison calculation table memory are provided, and at the same time when input image data is written to the image memory, a comparison calculation table A digital inter-image data comparison device that continuously outputs the required result image from the comparison calculation table memory by controlling the memory with the desired image data stored in the image memory and the input image data. Because there is
It has the following effects.

First, the present invention can detect the position of a dynamic part by comparing successive images.

Next, the present invention can detect the change position by comparing the background image and the input image.

Further, the present invention can have a simple structure by using a memory having a circuit structure capable of reading and writing simultaneously and a table memory.

Furthermore, since the present invention uses the table memory system, it is possible to set a necessary calculation result freely, which is applicable.

That is, according to the present invention, the image data is first stored in the image memory, and only the image data is read, so that the difference between the images can be detected by comparing the image memory data with the input image data. The result output is obtained.

Further, according to the present invention, the data read from the image memory is simultaneously written with the input image data, and the data in the image memory is sequentially updated. It becomes the previous image data. Therefore, by performing the comparison, the dynamically changing portions of the sequentially input images are detected, and the result output is obtained.

Further, according to the present invention, the image memory is initialized with the correction data regarding the position, and the table memory is initialized with the correction coefficient.
When only reading is performed from the image memory, the input image data is corrected and output. Therefore, it can be used for brightness correction, shading correction, masking, etc.

[Brief description of drawings]

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

Claims (1)

[Claims] 1. In digital image processing, reading and writing of image data are performed simultaneously (within one pixel transfer time).
Image memory configuration and a comparison calculation table memory, the input image data is written to the image memory, and at the same time, the comparison calculation table memory is input with the desired image data stored in the image memory. A digital inter-image data comparison device that continuously outputs the required result image from the comparison calculation table memory by controlling the image data according to the image data.