计算了图像比例尺，方便的将数字图像尺寸转换为实际尺寸；
Design the image scale, convenient of convert the numerical image size as actual size.
成像系统标定是机器视觉测量系统所成图像和实际被测尺寸之间实现高精度转换的关键过程。
The calibration of a camera system is a key step to the precise conversion between an image of machine vision and the real dimension.
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