Image distortion correction includes spatial correction and gray-levelcorrection.
图像畸变校正包括空间位置校正和灰度校正。
2
The invention also provides a water level measurement method and a water levelcorrection method.
本发明还提供了一种水位测量方法和水位校正方法。
3
The general theories of gray correction methods for the medical ultrasonic image are introduced in this paper, including gray levelcorrection, gray level transformation and histogram correction.