HARDWARE DESIGN OF PRECISION DEW-POINT HYGROMETER BASED ON IMAGE RECOGNITION TECHNOLOGY
ABSTRACT
The precision dew-point hygrometer is a kind of important humidity hygrometer. The photoelectric detection method is adopted generally in the dew-point hygrometer at present, but this kind of dew-point hygrometer cannot distinguish whether the condensation photograph on the mirror is dew point or frost point. So measure error must be incurred. In the thesis, we adopted image recognition technology to solve the problem.
Hardware system should be designed for dew-point and frost-point image acquisition before the study of the image recognition system. Hardware design are discussed in details. The hardware system is composed of two parts in function. The first part, which comprises an ADV7183 decoder chip, an EPM7128A CPLD chip and a CY7C1021 SRAM chip mostly, implements the acquisition of the video image signal. The second part, which includes a TMS320C6201 DSP chip, two CY7C1041 SRAM chips, and a SST39VF400A flash chip mostly, Processes the digital image signal.
DSP is the most important chip. TMS320C6000 is specially used in areas of image process and communication produced by TI. Using TMS320C62xx in real-time image processing is significant to improve the real-time quality of the system, reduce the volume and the power exhaustion of the system.
KEY WORDS: image recognition, DSP, CPLD, dew-point hygrometer, video image signal
