Research on Definition Evaluation Algorithm of the Test Equipments for Phoropters

摘要

Definition evaluation function of the defocused image is key to realize automatic focusing. Sensitivity of the definition evaluation function can directly affect detection accuracy of the test equipments. By analyzing and summarizing the definition evaluation functions which are commonly used currently, we will present a new image definition evaluation function based on wavelet transform in this paper. On the basis of theoretical analysis, we also establish and analyze the mathematical model of evaluation function, and make experiment and simulation with the series of images collected by the video image acquisition system. Compared with the traditional definition evaluation function, the definition evaluation function of defocused image defined by this algorithm is more sensitive to fuzzy degree of image and more consistent with human subjective vision.