A methods and apparatuses are disclosed for determining the state of elements in an image. The elements can be arranged in any regular pattern, such as a matrix of LCD display elements. The state of the elements is determined by extracting a characteristic of the elements, such as intensity, and processing...http://www.google.de/patents/US6577775?utm_source=gb-gplus-sharePatent US6577775 - Methods and apparatuses for normalizing the intensity of an image
