Enhancement of medical images based multi-scale Retinex

Objective To enhance the information of hidden area of medical images and image contrast,and compress the dynamic range.Methods An improved enhancement algorithm of medical images based on multi-scale Retinex was presented.The three different Gaussian filter coefficients under three different deviations were calculated,and the convolution operation was implemented between the image distribution and Gaussian filters.Weighted average of multi-scale was gained and mapped to gray range of display device.Results With this improved method,image contrast enhancement,sharpening and dynamic range compression were achieved at the same time.The information of hidden area of images was obviously enhanced.Conclusion Improved MSR can observably improve entropy of medical images,and also overcome the lack of enhancement of traditional methods and satisfy the clinic demand.