Evaluation for the gray-scale transformation of SAR images by the shape of histogram
Guan Bao · Systems engineering and electronics · 2004
Based on the shape difference of histograms before and after gray-scale transformation of synthetic aperture radar (SAR) images, seven gray transform methods are evaluate. Firstly linear gray-scale transformation for the original image is made. Then the transformed image is taken as a reference to evaluate the resulting images by seven gray transform methods. Three statistics to measure the shape difference of histograsm are proposes: relative mean error, relative variance error and relative skewness error. Test on the actual SAR images shows that the gray transform algorithm based on radiometric multiresolution analysis (RMA) is the best.