In the process of non-destructive quality inspecting and automatic grading of fruits with machine vision and image processing technology, the quality of fruit image captured by cameras would have great effects on the accuracy of inspecting and grading. So, it is very important to try to decrease the image distortion while capturing images. However, it is impossible to completely get rid of the image distortions, such as the distortions of grey level and color, caused by hardware of machine vision system and...