Abstract: In the applied course of producing picture information products, both the traditional image processing and the digital one have their own unique merits. The correlation overlapping diaphragm image enhancement technique is a kind of image processing in pace with the development of remote sensing technology. We can derive the algorithm of digital image processing using correlation overlapping diaphragm technique. It shows the traditional image processing and the digital one are inseparable. In the applied course of producing picture information products, they can promote each other to make up deficiencies and produce high quality products by means of each merits.