Contrast Improvement of Ultrasound Images of Focal Liver Lesions Using a New Histogram Equalization

Contrast improvement is an important issue in the processing of medical images. Due to the difficulty of detecting liver lesions in conventional ultrasound imaging and the low contrast of these images, we tried to provide an indirect optimization technique on the ultrasound images of Focal Liver Lesions database in the space of two-dimensional histogram to improve the quality and the contrast of these images. To prevent undesirable effects due to the adjustment of the histogram images, two techniques are used: CLAHE and RMSHE. By using four effective measurement techniques metrics of EME, PSNR, MSE and AMBE, shows that the proposed method has significant consequences. Furthermore; results of the study revealed that improved outcomes are obtained when the proposed technique is utilized on other standard ultrasound and medical images like mammography.