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Rapid image comparison method

A comparison and graphics technology, applied in the direction of instruments, character and pattern recognition, computer components, etc.

Active Publication Date: 2014-08-06
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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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

The invention discloses a rapid image comparison method. The rapid image comparison method includes the following steps of comparing a template image with the preset angle with a template image with the angle ranging from 0 to 360 degrees in advance so as to build an angle prediction table; obtaining an image to be detected, comparing the image to be detected with the template image with the preset angle so as to record the similarity of each position, and finding a plurality of sets of angles from the angle prediction table, wherein the angles correspond to the similarities; comparing template images with the multiple sets of angles with the image to be detected one by one so as to obtain the maximum similarity as a comparison result of each position. The shortcomings of a brute-force approach are overcome by an angle predication method. According to the angle predication method, an angle table is built well before image comparison, the possible inclination angle of an object in the image to be detected can be calculated by searching the table in the image comparison process, the angles needing to be compared are reduced, and the rapid image comparison effect is 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 changes in light and good anti-noise ability. [0003] r = Σ i = 1 m Σ j = 1 n ...

Claims

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Application Information

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