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热词
    • 4. 发明授权
    • Bitmap comparison apparatus and method using an outline mask and
differently weighted bits
    • 使用轮廓掩码和不同加权比特的位图比较装置和方法
    • US5835634A
    • 1998-11-10
    • US655909
    • 1996-05-31
    • Kenneth A. Abrams
    • Kenneth A. Abrams
    • G06T7/00G06K9/64G06T5/50G06K9/68G06K9/74
    • G06K9/6202G06T5/50
    • A bitmap comparison technique that is able quickly to compare two bitmap images while discounting differences between the images likely due to noise. The bitmap comparison technique includes the operations of: comparing the first and second bitmaps, producing a difference map identifying differing bits between the first and second bitmaps, producing outline masks based on the outlines of the first and second bitmaps, identifying certain very different bits within the difference map that are to be weighted differently from the remaining bits within the difference map based upon the outline mask, and determining a comparison score to indicate the extent to which the first and second images differ by differently weighting the very different bits and the remaining bits. The certain bits are normally weighted to a lesser extent than the remaining bits when determining the comparison score so that the influence of noise in the comparison score is diminished. The above bitmap comparison technique can be implemented in numerous ways, including as an apparatus, a method or as a computer-readable medium.
    • 一种位图比较技术,可以快速比较两个位图图像,同时折扣可能是由于噪声造成的图像之间的差异。 位图比较技术包括以下操作:比较第一和第二位图,产生识别第一和第二位图之间的不同位的差异映射,基于第一和第二位图的轮廓产生轮廓掩模,识别在第 基于所述轮廓掩模,所述差分图与所述差异图中的剩余位不同地加权,并且通过对所述不同位进行不同加权来确定所述第一和第二图像的差异程度的比较分数,并且剩余的 位。 当确定比较分数时,某些比特通常被加权到比剩余比特小的程度,使得比较分数中的噪声的影响减弱。 上述位图比较技术可以以多种方式实现,包括作为装置,方法或计算机可读介质。