Visible Edges Thresholding: a HVS based Approach

This paper presents a technique, which determines whether an edge is visible for a human eye or not. First, a threshold function is built according to the optical characteristics of the sensor and a contrast sensitivity function (CSF). Then, the DCT coefficients of each 8times8 block are computed. For each one, the computed spectrum is compared with the previous threshold function, which enables to conclude about the presence of visible picture elements. Finally, this information is applied to edges detection using a binarization technique. Results are given on images grabbed onboard a moving vehicle