Real-time analog electronic pseudocolor encoding based on an optical processing method

Abstract

Pseudocolor display is developed to increase the visually distinguishable levels. Pseudocolor display can be generated by an electronic digital system or an optical processor.1,2 The principle of the optical method is as follows: Positive and Negative images of the gray-level input are en coded with two primary colors, for example, red and blue. Then the product of the positive image and the negative image is encoded with the third primary color, in this case, green. The superim position of these three color-encoded images results in a pseudocolor image of the gray-level input. We develop an analog electronic system in which a monochrome gray-level video signal is directly transformed into red, green, and blue video signals similar to the optical method mentioned above. If the gray-level intensity signal is denoted by I(t), where 0 ≤ I(t) ≤ 1, color signals are generated as follows: R(t) = I(t), B(t)= 1−I(t), and G(t) = I(t)[1−I(t)], where R(t), B(t), and G(t) are red, blue, and green signals, respectively.