A controller of an ACDC flyback switching power supply uses adaptive digital control approaches to control the switching operation of a BJT power switch based on primary-side feedback to regulate the secondary-side constant output voltage and output current, without using the input line voltage. More specifically, an apparatus may implement these techniques. The network also includes a source of information about the resource. An editing area on the displayed image, in which the displayed image is to be subjected to the selected type of image processing, is defined according to the information on the designated points and the selected type of image processing. M is a function of the edge weights in each path of S.