JAI AM-800CL User Manual

Also see for AB-800CL: User manual

Contents

JAI AM-800CL User Manual Manual pdf 42 page image

AM-800CL / AB-800CL- 40 -8.6. Blemish compensationThe AM-800CL and AB-800CL have a blemish compensation circuit. This functioncompensates blemishes on the CCD sensor (typically pixels with extremely high response orextremely low response). This applies to both monochrome and color versions. Pixels thatfulfill the blemish criteria can be compensated by adjacent pixels on both columns and, inthe case of the AB-800CL, the defective pixels can be compensated by the same Bayer colorpixels in both adjacent columns. The number of pixels that can be compensated is up to 64pixels per tap, for a total of 256 pixels.The built-in compensation circuit for the AM-800CL and AB-800CL uses compensation datacollected in the factory and can be turned ON or OFF. The default setting is OFF.Fig. 39 Blemish compensationNote: If defective pixels are found consecutively in the horizontal direction, the blemishcompensation circuit does not work.8.7. LUT (Relative commands LUTC,LUTR,LUYG, LUTB)This function can be used to convert the input to the desired output characteristics.The Look Up Table (LUT) has 256 points for setup and each point has an 8-bit gain value. Theoutput level can be created by multiplying the gain data by the input level.In the AB-800CL, the same LUT characteristic is applied independent of the color value.If input data is not in the LUT, the weighted mean average data from upper point and thelower point are used.1 256CCD outputThe required characteristics can be achieved by multiplyingLUT parameter and each of 256 points.Fig.40 LUT concept drawingB/WColorBlemish Compensation Principle Defective Pixel