Method for enhancing optical image

Abstract

The invention relates to a method for enhancing an optical image. The method comprises the following steps of: 1, inputting an image acquired in photoelectric navigation; 2, performing point-by-point scanning on the image, and acquiring a pixel value, namely pixel (a, b) of the current pixel point; 3, acquiring pixel values of adjacent pixel points at the top left corner, the bottom left corner, the top right corner and the bottom right corner of the current pixel point respectively; 4, solving relative difference values, namely difpix of the current pixel point and (2<n> + 2<m>) adjacent pixel points obtained in the step 3; 5, solving an absolute value of the relative difference value, namely the absolute value of difpix, comparing the absolute value with a set threshold, namely TH4, setting the pixel value of the current pixel point with a coordinate value of a (a, b) point to be the absolute value of difpix multiplying by M when the absolute value is larger than the threshold, namely the TH4, and setting the pixel value of the current pixel point with the coordinate value of the (a, b) point to be 0 when the absolute value is smaller than the threshold, namely the TH4; and 6, after performing the point-by-point scanning on the image, acquiring an enhanced contrast image. The method is easy to operate, good in enhancement effect and suitable for circuit realization, and enhancement efficiency is improved.

Description

technical field [0001] The invention relates to a pixel extraction method, in particular to an optical image enhancement method, which belongs to the technical field of electronic eye pattern recognition and photoelectric navigation. Background technique [0002] At present, the enhancement method of optical image mainly adopts the extraction of one-dimensional direction, so that a contrast-enhanced feature image can be obtained. The specific extraction method is as figure 1 As shown: in the one-dimensional direction of the collected image, the corresponding pixel point pix is ​​collected, and two adjacent points pix1 and pix2 of the pixel point pix are collected in the one-dimensional direction, and then it is judged by the difference whether it is necessary Enhance the pixel point, that is, whether pix_new=2*pix-(pix1+pix2) is greater than the set threshold, if it is greater than the set threshold, the feature point is enhanced; the size of the threshold is consistent wit...

AI Technical Summary

Problems solved by technology

However, due to the great influence of adjacent pixels in the image sensor array, the gray value of the collected corresponding pixel is often very close to the gray value of several surrounding pixels, so the comparison of adjacent pixels in the one-dimensional direction cannot achieve the comparison. purpose, the effect on image enhancement is not obvious

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