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    • 1. 发明授权
    • Shading correction method, and apparatus therefor
    • 阴影校正方法及其装置
    • US5621824A
    • 1997-04-15
    • US70360
    • 1993-06-01
    • Takashi IjiriToshihiko MatsumotoToshimichi MasakiNaoshi AwanoOsamu Motooka
    • Takashi IjiriToshihiko MatsumotoToshimichi MasakiNaoshi AwanoOsamu Motooka
    • H04N1/401G06T1/00G06K9/40
    • G06T15/80G06T15/506
    • An image obtained by imaging an object having a solid shape, such as that of a circular column or prism, develops a distribution in brightness since the angle of each portion of the surface of the object with respect to a lighting device and image pick-up device differs depending upon the location. The distribution of brightness is substantially uniform along the longitudinal direction of the object but varies transversely of the object. One line is designated on the captured image of the object in a direction that cuts across the object, and the distribution of brightness on this line is obtained. A two-dimensional shading pattern is obtained by expanding this brightness distribution in the longitudinal direction of the object. The shading pattern represents the distribution of the brightness in the image of the surface of the object. Accordingly, a shading correction is performed by subtracting the shading pattern data from the image data of the object, and the distribution of brightness caused by the solid shape of the object is eliminated.
    • PCT No.PCT / JP91 / 01664 Sec。 371日期:1993年6月1日 102(e)日期1993年6月1日PCT 1991年11月29日PCT PCT。 第WO92 / 10810号公报 日期1992年6月26日通过对具有圆形列或棱镜的实心形状的物体进行成像而获得的图像显现出亮度分布,因为物体的每个部分相对于照明装置的角度 并且摄像装置根据位置而不同。 亮度的分布沿着物体的纵向基本均匀,但是在物体的横向方向上变化。 在对象的拍摄图像上沿着切割对象的方向指定一条线,并且获得该线上的亮度分布。 通过在物体的纵向方向扩展该亮度分布来获得二维阴影图案。 阴影图案表示对象表面的图像中亮度的分布。 因此,通过从对象的图像数据中减去阴影图案数据来执行阴影校正,并且消除由对象的实体形状引起的亮度分布。