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    • 15. 发明授权
    • Image processing apparatus and method for detecting a feature point in an image
    • 用于检测图像中的特征点的图像处理装置和方法
    • US07903880B2
    • 2011-03-08
    • US11652501
    • 2007-01-12
    • Paul WyattHiroaki Nakai
    • Paul WyattHiroaki Nakai
    • G06K9/48
    • G06K9/48G06K9/4609G06T7/13
    • An apparatus includes: a spatial differential value calculation unit that calculates a primary spatial differential value and a secondary spatial differential value of a brightness value with respect to each of a plurality of directions in each pixel of the image; a maximum and minimum direction estimation unit that estimates a maximum direction and a minimum direction for each pixel, the maximum direction being a direction with which the primary spatial differential value is a maximum value, the minimum direction being a direction with which the primary spatial differential value is a minimum value; and an evaluated value calculation unit that calculates a first evaluated value of each pixel using the primary spatial differential value in the maximum direction, the primary spatial differential value in the minimum direction, and the secondary spatial differential value in the maximum direction.
    • 一种装置,包括:空间微分值计算单元,其针对图像的每个像素中的多个方向中的每个方向计算亮度值的一次空间微分值和二次空间微分值; 估计每个像素的最大方向和最小方向的最大和最小方向估计单元,最大方向是主要空间微分值是最大值的方向,最小方向是主要空间差异的方向 值是最小值; 以及评估值计算单元,其使用最大方向上的一次空间差分值,最小方向上的一次空间微分值和最大方向上的二次空间微分值来计算每个像素的第一评估值。