Digital image edge is a principal feature of many signals, including infrared, radar, and visible - light signals. It is also strongly stable. So in target identification, we often extract digital image edge.Inhibitory interaction allows animals to see images better in several ways: (1) no distortion, (2) rapidity in seeing, (3) robustness against disturbance. We utilize the principle of inhibitory interaction to improve the extraction of digitai image edge.First, we designed a basic construction of inhibit...