直方图规定化 规定灰度为[zeros(1,49),0.1,zeros(1,49),0.2,zeros(1,49),0.3,zeros(1,49),0.1,zeros(1,49),0.2,zeros(1,49),0.1]

直方图均衡化，四邻域平均法，阈值平均法

加权平均法-　Gray histogram specification provides for the [zeros (1,49), 0.1, zeros (1,49), 0.2, zeros (1,49), 0.3, zeros (1,49), 0.1, zeros (1, 49), 0.2, zeros (1,49), 0.1] histogram equalization, neighbors and domain average method, the threshold average method weighted average method