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    • 2. 发明授权
    • Image processor with illumination variation compensation
    • 具有照明变化补偿的图像处理器
    • US5065443A
    • 1991-11-12
    • US445207
    • 1989-12-04
    • David W. Farchmin
    • David W. Farchmin
    • G01B11/24G06T1/00G06T5/00H04N5/225H04N5/235H04N5/243H04N7/18
    • G06T5/007G06T7/0081H04N5/243G06T2207/10152G06T2207/20148G06T2207/30164
    • An image processor analyzes objects such as work pieces passing along an assembly line. The processor stores a reference ratio of exemplary signal levels from the object and its background. As subsequent images are processed, a signal level for the image background is detected and multiplied by the reference ration to derive a theoretical signal level for the object in the image. The theoretical signal level and the actual signal level for the object are compared to detect a predetermined relationship therebetween. When the predetermined relationship exists, the amplification of the image signal is adjusted to achieve a predetermined difference between the background and object signal levels. If the predetermined relationship does not exist, the amplification of the image signal is adjusted to achieve a predetermined difference between the background image signal level and the theoretical signal level for the object.
    • 图像处理器分析诸如通过装配线的工件的物体。 处理器存储来自对象及其背景的示例性信号电平的参考比。 随着后续图像被处理,检测图像背景的信号电平并乘以参考比例,以导出图像中对象的理论信号电平。 比较对象的理论信号电平和实际信号电平,以检测其间的预定关系。 当存在预定关系时,调整图像信号的放大以实现背景信号和对象信号电平之间的预定差异。 如果不存在预定关系,则调整图像信号的放大,以实现背景图像信号电平和对象的理论信号电平之间的预定差。