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1. 发明授权

US06826307B1 Contrast determining apparatus and methods 有权
标题翻译：对比度测定装置及方法
公开(公告)号：US06826307B1
公开(公告)日：2004-11-30
申请号：US09254262
申请日：1999-03-24
申请人： Simon Lau , Brinley Rhys Roberts
发明人： Simon Lau , Brinley Rhys Roberts
IPC分类号： G06K948
CPC分类号： G06T7/40 , G06T2207/30164
摘要： The contrast determination apparatus includes illuminating light sources (12) and an image sensor (26) i.e. a 2-D CCD for capturing a two-dimensional image of e.g. a marked wire (32) on a holder (34), the captured image being sampled over the mark and the background. The sensor includes an optical system (28,30) selected with regard to the character size of the marks so that the field of view of the sensor is sufficient to contain a complete character as well as a generous amount of background. An area of the captured image is designated in which the samples for contrast measurement are to be taken, and a processor (24) takes the pixel values from the image which are thresholded to categorise them as “black”, or “white”, thus forming a two-tone image. Aggregates or averages of the “black” and “white” pixel values are used to derive the contrast measurement according to the formula: (Imax−Imin)/Imax where Imax is the average value of the “white” pixels and Imin the average value of the “black” pixels.
摘要翻译：对比度确定装置包括照明光源（12）和图像传感器（26），即用于捕获例如二维图像的二维图像的2-D CCD。在保持器（34）上的标记线（32），捕获的图像在标记和背景上被采样。传感器包括关于标记的字符尺寸选择的光学系统（28,30），使得传感器的视场足以包含完整的字符以及大量的背景。指定拍摄图像的区域，其中将采取用于对比度测量的样本，并且处理器（24）从被阈值化的图像中取出被分类为“黑色”或“白色”的像素值，因此形成双色图像。 “黑色”和“白色”像素值的聚合或平均值用于根据以下公式导出对比度测量：（Imax-Imin）/ Imax，其中Imax是“白”像素的平均值，Imin在平均值的“黑色”像素。

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