The method of controlling the speed of cooling wheel with the position of the adhesive tape is proposed. The position of the adhesive tape is gained with the CMOS digital camera. Based on the core of FPGA

two pieces of SRAM are used in the system to achieve ping-pong operation . According to the synchronous signal produced by CMOS camera

the image is sampled and stored into one of the two SRAMs by FPGA. At the same time

the image data stored in the other SRAM is read out and processed. To detect the position of the adhesive tape

the method of grey is used. One sampled image and the simulation result are given. The sampled image shows that the image quality of the CMOS camera satisfy the need of the project. The simulation result shows that the SRAM ping-pong operation is realized and the position detection of the adhesive tape is completed. The system is connected with the cooling wheel speed control system and works reliably.