Abstract:  To correct printing mistakes timely and improve print quality, a printing density detection system based on ARM ( Advanced RISC Machines) chips is provided. The system can make density detection digitization and automation, systematic in the printing process. IMAGERECEIVER is used as an image acquisition module, Embedded CMOS (Complementary Metal Oxide Semiconductor) image acquisition chips(OV511 and OV7620) are used as an image capture device, PPI-DMA (Pixel Per Inch-Direct Memory Access) is used as high-speed data transmission channel, LCD (Liquid Crystal Display) is used as an image display, keyboard is used as a human interface device. The images are transformed to grayscale images and digitized images, and then the dot area is calculated. Finally, the function of printing dot density detection is performed. The experiment results show that the system can achieve printing density detection.

Key words: dot area densit,  embedded, image processing, print density detection