noise gray scale difference estimation
average gray difference
binary gray scale image
Cross-line Gray-scale Image
Direct gray-scale image tracing
encryptions of gray scale image
extension of gray-scale
gray scale
灰度
灰阶
灰黑比
灰度值
色量级
灰度等级
灰度标
灰梯尺
灰度级
灰阶标度
灰色刻度
硅片的格雷
多灰阶
灰度尺
摄灰色级谱
Gray scale character recognition