The general theories of graycorrection methods for the medical ultrasonic image are introduced in this paper, including gray level correction, gray level transformation and histogram correction.
介绍了超声医学图像灰度校正常用方法的基本原理，这些方法主要有灰度级校正、灰度变换及直方图修正。
2
Based on the feature of plate rolling process, pass correction based on gray relational grade is put into forward.
基于中厚板的轧制特点，提出了基于灰色关联度的道次修正算法。
3
Based on the gray system theory, the paper suggests a kind of gray modeling method with incomplete-quotient distinguished correction, which is characterized by high accuracy and simple algorithm.