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《Opto-electronic Engineering》 2005-12
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Focusing algorithm for image measurement of object with linear edge

LIU Wen-yao,WANG Bing-zhen ( Key Laboratory of Opto-Electronics Information Science and Technology, Ministry of Education, College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China )  
In view of the focusing-problems in the measurement of images with linear edge, a focusing algorithm based on the gradient information of image edge to be measured is presented. In the evaluating area including the edge to be measured, the algorithm calculates the gray-level gradient of edges for every row or column. According to the property that edge-gradient is maximal in focus, the algorithm takes the average of the gotten gradients as the evaluating criteria of focusing degree. Two common-used focusing algorithms, gray-difference algorithm and gray-variance algorithm, are compared with this algorithm. The test result shows that in the case of same smoothness, the peak value increases by a factor of ten compared with gray-difference algorithm, which overcomes the shortcoming of gray-difference algorithm depending on threshold and makes the smoothness of focusing curve better. The average of local fluctuating range is about tenth of that of gray-difference algorithm.
【CateGory Index】: TP274.4
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