Eyelash occlusion area pre-detection method based on variable coefficient

The invention discloses an eyelash occlusion area pre-detection method based on a variable coefficient. The method comprises the following steps: partitioning an upper region and a lower region of aniris; calculating variable coefficients of an upper block and a lower block which are symmetrical about the circle center of the iris; whether blocks on the irises are shielded by eyelashes or not isjudged by comparing the variable coefficients of the upper blocks and the lower blocks, whether the blocks on the irises are shielded by the eyelashes or not is judged by comparing the gray level distribution difference of the areas of the upper blocks and the lower blocks of the irises, and the areas, shielded by the eyelashes, of the blocks on the irises are integrated to obtain an eyelash shielding area. According to the method, the eyelash distribution range in the iris area is predetermined, the search range of later eyelash detection is narrowed, the detection efficiency is improved, andthe false eyelash detectio