Image equalizing method, involves selecting peripheral blocks presenting difference lower than threshold with respect to central block, and calculating general mean value by assigning weighting to mean value of peripheral blocks

摘要

The method involves determining an initial difference between initial mean values of central and peripheral blocks (B22, B11, B12). The peripheral blocks presenting a difference lower than a predetermined threshold with respect to the central block is selected. A general mean value is calculated by assigning a weighting to the mean value of the peripheral blocks based on inverse function of the initial difference. The general mean value is applied to the selected peripheral blocks after calculating general mean value in repeated manner by applying the value only to the central block.