短語(yǔ)詞組短語(yǔ)gray mean value generation 灰色均值生成gray scale value 灰度值gray -value differential invariants 灰度差分不變量gray copper value 灰度值region gray average value -grad 區(qū)域灰度均值Arithmetic mean of gray -value 灰度期望值 返回 gray value