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。

The general theories of gray correction methods for the medical ultrasonic image are introduced in this paper, including gray level correction, gray level transformation and histogram correction.

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硬件的校正精度取决于软件的校正精度，双线性内插法具有良好的精度、完全满足一般图像灰度校正的要求。

The accuracy of hardware correction is decided by the accuracy of software correction. The hardware bilinear interpolation has good accuracy and can correct general images.

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针对CCD成像时中间亮两边暗的畸变特点，用双线性插值的方法对图像进行灰度校正。

According to the imaging character of CCD, a new method to calibrate the distortion image is brought forward.

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