足部标记图像中标尺提取与像素测量

测量足部关节受力后的位移大小，进而研究足部关节的运动特性，需要计算足部标记图像中每个标记点的位移。实验采集图像中，黑色标记点和矩形区域分别为探测电极和标尺。实现了足部标记图像中标尺的自动提取与像素测量，根据最小二乘直线拟合思想，提取标尺的边界直线，并求其下方两端点的像素距离，然后利用标尺长度求出每个像素所代表的实际长度；实现了像素距离与标尺长度的自动转换，为足部疾病的临床诊断与治疗提供服务。

Scale extraction and pixel measurement in foot marker image

In order to measure the displacement of the foot joints under different press and further study their movement trait, the displacement of each marker in the foot marker images needs to be calculated. The black markers and rectangular region in the experiment images are the probes and scale. In this paper, scale extraction and the automatic pixel measurement of a foot marker image were realized. First, the authors extracted the border of scale according to the linear least squares method and computed the pixel distance between the two endpoints at the bottom of the scale, then calculated the actual length that each pixel represented and realized the automatic conversion between pixel distance and the length of the scale, which provided service for diagnosis and treatment of the foot diseases.