Research And Design Of An Off-line Portable Scanner On DSP

As a computer's graphic and image input equipment, scanner has been applied to the fields such as graphic and image processing, publishing and printing, office automation, etc. But now on the market, a common character of all kinds of scanners is that the application is based on line to computer, so on some occasions this is not convenient for the users.This paper presents a design method of an off-line portable scanner, which can be used without computer. We discuss the system based on a synchronous Digital Signal Processor with multicenter, which is used to gather data with high speed. TI's TMS320VC5402 is a sixteen-bit fix processor, and we make it the core of our control system. Because it can not only handle data with high speed but also manipulate the data by abundant arithmetic/logic operations and determine the results of processing which can be output quickly as images. This controller can implement different scanning controls for various common portable scanners of 100 to 400 dpi. It can communicate with PC through LPT, and fulfill the further display, analysis and handling of the scanning image data. The off-line portable scanner is easy to carry and can deal with the image on-the-spot.