Closed-circuit Monitor Backlight Processing Hardware And Software Design,

Along with the development of the intelligent building profession of our country, for intelligent building.in install to insure technical requirement also grow increasingly. Closed-circuit television ( abbreviation CCTV) is intelligent building in general install to insure system, the illumination condition of its monitoring environment gets the influence of various factor and time changes. How to solve because of Counter light causes the goal object dark , details unclear is the crucial technology of image handling in the supervisory system of closed circuit.Based on image gray scale ,this paper put forward the soft, hardware processing technique of handling for counter light. Handle the environmental weak condition of countering light with software compensation; For strong contrary smooth condition, with hardware processing technique. In which, judge intelligently that environment is strong and weak as being shaded to be systematic key , have put forward the intelligent law of judging of memory deviation algorithm for this.In software compensation, the gray scale that adopts image stretches law, for specific gray scale stretches handling, restrains for another partial gray scale , reaches ideal purpose.The serial communication of this paper for PC has carried out partial research. In hardware handling, realize the communication of PC and external hardware with serial communication. Use functions of Windows API some volumes of describe own serial communication kind of CserialPort realization the specific function in system. Establish internal communication agreement , devise the hardware decode circuit based on this agreement. At the same time, have designed electric level change-over circuit andcommunication signal and the drive of change-over circuit and diaphragm control circuit.