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Image distortion correction method based on look-up table

A technology of image distortion correction and lookup table, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of image quality degradation, misjudgment, error, etc., and achieve the effect of saving correction time

Active Publication Date: 2015-11-25
JIANGSU BRMICO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of lens generally has a certain degree of optical distortion during the imaging process, which causes some changes in the size and shape of the imaging image, and the quality of the image is reduced, which will bring errors to the subsequent image analysis and image measurement, and even cause misjudgment. , so it is necessary to correct the geometric distortion of the image caused by the camera lens with a large field of view and a short focal length

Method used

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] Embodiments of the invention include:

[0022] A method for correcting image distortion based on a lookup table, the steps comprising:

[0023] (1) Obtain the distortion map, perform grayscale transformation on the distortion map; then use the threshold method to perform binarization, in which, the grayscale value of the pixel belonging to the grid network in the grid binary image is 255, and the grayscale value of the remaining pixels is 0; then, refine the grid line single pixel to obtain a plane grid image...

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Abstract

The invention discloses an image distortion correction method based on a look-up table, and the method comprises the steps: generating the look-up table according to selected reference points in plane grids; enabling a plurality of pixels to be mapped at the same position according to the look-up table; and calculating a mapping proportion of each row according to the look-up table. Moreover, the method can carry out image collection while carrying out image correction. Through the above mode, the method can meet the requirements of target images with different resolution, saves the time in image collection and correction, and relaxes the restriction on the length and width of an image.

Description

technical field [0001] The invention relates to the field of fingerprint identification algorithms, in particular to an image distortion correction method based on a lookup table. Background technique [0002] my country has a very long history of using fingerprints to identify identities, and with the continuous deepening of research on fingerprint identification systems by domestic and foreign scholars, fingerprint identification technology is becoming more and more mature. The main aspects of fingerprint identification research include: fingerprint image preprocessing, fingerprint classification, fingerprint identification Feature point extraction and fingerprint matching, the most important of which is the image preprocessing stage. At present, in aerospace and aerial photography, medical treatment and various high-precision measuring instruments, in order to obtain more image information about the target scene, a lens with a large field of view and a short focal length i...

Claims

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Application Information

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IPC IPC(8): G06K9/32
CPCG06V10/242
Inventor 殷丽红佟宝同张飞飞
Owner JIANGSU BRMICO ELECTRONICS
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