A digital signal processor for linear sensors

A 132 K transistor device which performs black-level, gain, and defect corrections, line-rephasing, color matrixing, and curve-shaping functions on linear sensor data while interfacing to external memory and a data bus is described. The 2 μm CMOS chip can be used with a wide range of sensor resolutions for various image-scanning applications. The chip performs the following functions: digital correlated double sampling, black-level correction and gain correction for each photosite, sensor defect concealment, color matrixing, and look-up table operations for space transformations. Additionally, three interface circuits are implemented to store and retrieve black-level and gain correction values, rephase red, green, and blue values to provide line coincidence, and function as a simple computer for loading coefficients and writing the processed image data