三值光学计算机解码器亮度阈值自动测定技术

Auto-measurement of grayscale threshold of ternary optical computer's decoder

为了使三值光学计算机解码器对亮度各不相同的被解码图像都能做到准确解码,提出了根据灰度值对图像像素亮暗判定的阈值设定技术。其基本策略是找出各像素亮状态时的灰度最小值和暗状态时的灰度最大值,以亮状态灰度最小值下移10个灰度级为亮状态的判定阈值,以暗状态灰度最大值上移10个灰度级为暗状态的判定阈值。实验结果表明,以这样的两个阈值为判定标准,三值光学计算机解码器对光学处理器输出结果的判定准确度达到100%。

In order to exactly decode the images exported trom optical processor, a grayscaie vatue auto-test system is researcneu for ternary optical computer decoder last year. The techniques of the system are presented. The basic strategy to decide the thresholds is as the follows., firstly gray minimum of bright state and gray maximum of dark state of each pixel of optical processor are found, then the bright threshold is gotten from minimum bright gray reducing 10 and the dark threshold from maximum dark gray rising 10. Some experiments show, with these two thresholds as decision criteria, the outputs of optical processor are decoded exactly in 100%.