Studying On 3-D Synchronization Imaging System For Linear Appraisal Of Dairy Cow Conformation

Linear appraisal of dairy cow conformation based on image processing technique already has become an important part of optimizing breeding of which includes two step: in focus and isochronous grabbing side,frontage,backside of cow 3-D image; image processing and identifying. The system makes up of imaging equipment and orientation equipment. modularization design is adopted which includes imaging equipment module,electric barrier module and two automatic door module. Pc is the controller of imaging equipment, and AVR SCM ATmega32 is the controller of orientation equipment. Each module has unattached controlling and transmission system, so that they may work all alone. Pc controls each module communication by RS232 serial port through voltage conversion chip MAX232 and coordinates them operation according to predetermined time sequence. SCM as guest computer is used for gathering data and controlling operation of automatic door or electric barrier. In this way, a master and slave distributed system is constituted, in which host computer controls and communicates guest computers forming structure system of centralized manage and distributed control.The cow advances through front door, electric barrier, back door and induces on-off signal change of corresponding photoelectric switch. SCM gathers the change signal, communicates with PC through RS232 and controls operation of automatic door or electric barrier. PC controls DH-QP300-- 4-channel Color Frame Grabber to grab isochronous three-dimensional image of cow by using three CCD video camera. System correspond each equipment operation according to schedule and grab automatic three-dimensional image of cow because of no man's operation in the whole process.Brushless dc motor is powerplant of orientation equipment, and special integrated circuits MC33035 of brushless dc motor and ATmega32 are controller. Combine with mc33039 to form Closed Loop Control of motor speed,PWM is adopted to adjust speed.Labview software is adopted to transfer dynamic link libraries to control current frame grabber; single field grabbing mode is adopted to improve image quality.The experimental result showed that the time of images acquisition and linear appraisal is about 3 min, which is less than the standard time 5 min. And the images quality with clear edge and light noise could satisfy the requirements of continued feature extraction algorithm.