用信息容量这一示性参数来表征高相关图像灰度层次的丰富程度，这与视觉效果达到了很好的一致。
Richness of gray level of highly correlative image was expressed using information capacity, which agrees greatly with the effect of vision evaluation.
针对图像灰度变化和遮挡问题，提出一种增量符号相关的景象匹配方法。
A scene matching approach based on increment sign correlation is proposed to solve the problem of gray change or occlusion in image.
增量符号相关方法对图像灰度值的变化不敏感。
Increment sign correlation is robust to small change of the image intensity.
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