计算机图像技术在高温锻件尺寸测量中的应用

利用彩色CCD和红外滤光片等搭建了高温锻件的尺寸测量平台，通过数字滤光与物理滤光技术提高锻件图像质量，采用比较测量法精确测量锻件二维尺寸。通过采集标准量块图像并应用畸变校正、噪声抑制、亚像素边缘提取等标定出系统的像素尺寸当量，然后选用其它标准量块进行验证，测量系统的横向测量不确定度为0.005 1 mm，纵向测量不确定度为0.008 7 mm。温度在1 000 ℃时采集45#锻件的图像并进行解算，所得测量尺寸与理论值的绝对误差小于1 mm，满足该系统的测量精度要求。

Application of Computer Image Technology on Size Measurement of High Temperature Forging Workpiece

The color CCD and infrared filter are adopted to set up the measurement platform of high temperature forgingsThe digital and physical filter technologies are applied to improve the quality of forging image and comparison measurement method is utilized to derive its two dimensional size accurately In order to calibrate the equivalent size of pixels in image，images of standard gauge blocks are captured and distortion calibration，noise suppression and sub pixel edge detection are executed As it is verified by other gauge blocks，the horizontal measurement uncertainty of the system is  0.005 1 mm，while the vertical is 0.008 7 mmAt 1 000 ℃，image of 45# forging is captured and its dimension is calculated through the procedure，which has a difference less than 1 mm compared with the theoretical value，and meets the requirements of the precision.