Fast Graphical Comparison Method

A comparison and graphic technique used in instruments, character and pattern recognition, computer parts, etc.

Active Publication Date: 2017-09-22
DELTA ELECTRONICS INC
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  • Abstract
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Problems solved by technology

In order to solve the above problems, related fields have tried their best to find a solution, but no applicable method has been developed for a long time.

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Embodiment Construction

[0041] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, and the same numbers in the drawings represent the same or similar elements. On the other hand, well-known elements and steps have not been described in the embodiments in order to avoid unnecessarily limiting the invention.

[0042] The technical scheme of the present invention is a fast graphic comparison method, which can be applied to test machines or widely used in related technical links. It is worth noting that the graphics comparison process of this technical solution can be divided into two stages. The first stage is to establish the angle prediction table and calculate the relevant parameters used in the graphics comparison (such as Figure 2 ~ Figure 3 shown), the second stage is to use the angle prediction table to speed up the graphics comparison (such as Figure 4 ~ Figure 9 shown). ...

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Abstract

A fast pattern comparison method is disclosed here, which includes the following steps: comparing a template image of a predetermined angle with a template image of 0-360 degrees in advance to establish an angle prediction table; then, obtaining an image to be tested , compare the image to be tested with the template image at a predetermined angle to record the similarity of each position, and find out multiple sets of angles corresponding to the similarity from the angle prediction table; then, compare the template images of multiple sets of angles one by one Compare with the image to be tested to take the maximum similarity as the comparison result of this position. It uses the angle prediction method to improve the shortcomings of the violent method. The angle prediction method is to establish an angle table before the graphics comparison. When the graphics are compared, the possible tilt of the object in the image to be tested can be calculated by looking up the table. In order to reduce the angles to be compared, the effect of fast graphic comparison can be achieved.

Description

technical field [0001] The invention relates to a fast graphic comparison method. Background technique [0002] Graphics comparison technology uses a similarity index to judge the similarity between graphics. Generally, graphics comparison technology uses two graphics for comparison, one is the template image, and the other is the image to be tested. The comparison purpose It is to find the best correspondence between graphs. The most commonly used graphic comparison technique is Normalized Cross Correlation (NCC), as shown in the following relational expression, which is characterized by insensitivity to light changes and good anti-noise ability. [0003] [0004] where r = similarity [0005] m, n = target window size [0006] W(i, j), G(i, j) = gray scale value of target window and search window [0007] [0008] The general graphic comparison technique is to compare the template image from 0° to 360° with the image to be tested, so as to calculate the inclinati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/64
Inventor 魏壮宇
Owner DELTA ELECTRONICS INC
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