Software Development Of Seeds Flow On Machine Vision Measurement System Adaptive Calibration

BST-6 type seeder test-bed, seed quality and planting accuracy test, measurement, analysis, etc of hanging planter by machine vision method. Prepare necessary for the determination of seed flow analysis testing model parameters, need for camera calibration in advance, because of using manual calibration shortcomings such as low efficiency and poor precision of calibration, so you n-eed to develop an adaptive camera calibration system based on software.Attributed to seeder test-b ed of seed flow under different size of field measurement analysis, under the camera needs to be done on the vertical, mobile, paper move camera adaptive calibration system is divided into camer-a system and adaptive calibration software system.System requirements, according to the volume of the camera field of view camera movement by t-he upper machine (computer) down a machine send instructions (step motor controller), the machin-e according to the received different instruction output pulse signal and the direction of the signal to the stepper motor drives, stepper motor is driven by a drive, turn and stop.Stepper motor with linear module connected by coupling, linear slide block on the module and square piece, beams a-nd installed on the beam of the 6 camera connection, thus the stepper motor rotation move up an-d down vertically into the camera, installed on the linear module of the position sensor of the ca-mera location information back to the computer, in order to ensure the camera position accurately.The camera movement system can request according to the length of the camera view, detecti-on of positioning plate round number to control the camera movement.Control process is:by the upper machine (computer) via a serial port (stepper motor controller) sent down a machine instruct-ions, lower machine according to the received different instruction output pulse signal and the dir-ection of the signal to the stepper motor drive, drive to drive stepping motor is, turn and stop.Ste-pper motor with linear module connected by coupling, linear slide block on the module and square piece, beams and installed on the beam of the 6 camera connection, to be able to convert the ro-tation of step motor as the camera moved up and down vertically, installed in a linear position s- ensor, the position of the camera on the module information back to the computer, to ensure that the camera moved to the location specified.Adaptive camera calibration software system by collecting a point in the scene and three unequal and unparallel lines to complete the camera calibration process, adaptive can obtain accurate calibration matrix.The experimental results show that:step motor after decelerating the mobile system to drive a-t the speed of 1 r/s the camera vertically move up and down, to ensure the quality of the imag-e well, no jitter phenomenon.Adaptive calibration software system can collect accurate to the seen-e of the corner points and three lines.Using the SAS statistical analysis software under different fi-eld measurement of the checkerboard on two distance is no significant difference and the error of the measured values, significant P value is 0.9999, and the average error is less than2.37%, the standard deviation is less than5.2%.Software calibration object distance under different field of vi-ew and the error of the measured values is not significant, the significant value of P is 0.1614, and the average error is less than 6.2%, the standard deviation is less than 16%, the above data s-hows that the relative error of the two groups have nothing to do with the length of the field, m-odule of the calibration accuracy is higher, with wider range of calibration, calibration parameters obtained can be used for subsequent seed flow measurement and analysis of vision.Running time for field calibration module is 21ms, the camera calibration module for run time is 14ms,running t-ime is shorter, can realize fast adaptive calibration.The calibration system only a single image can be carried out on the camera calibration, can greatly reduce the calibration time, higher than manual calibration accuracy, high efficiency, can re-duce labor intensity, improve the efficiency of experiments.