Process and system for generating a full color image or multispectral image from the image data of a CCD image sensor with a mosaic color filter.

摘要

Process and system for producing color images and/or multispectral images in which an optical arrangement (3) images a scene on a CCD image sensor (2), said sensor being covered by a mosaic filter with a periodically repeating basic pattern (GM). A following analog/digital converter (5) produces digital signals from all pixels pij of the CCD image sensor (2). The basic pattern (GM) consists of a minimum of five different filter elements. In addition, an image memory (6) is provided which is divided into image memory levels (B0, B1,....,BnF). The process comprises the following steps:storing of values (wert[i][j][0]) of each individual pixel (pij) of the CCD image sensor (2) in a dedicated level B0 of the image memory (6), said values being determined by the CCD image sensor (2) and converted by a following analog/digital converter (5) into digitial values;determining an "unfocussed image" in the following way: for each color f and for each pixel p the neighboring pixels of color f are measured, their values read from B0 and combined to arrive at a weighted average value;storing of values (wert[i][j][f]) for all the different filter elements on the CCD image sensor in dedicated image memory levels (B1, B2,....,BnF);calculating final color values (C1,C2,......,CnF) by means of additive image sharpening; andstoring the final color values (C1,C2,......,CnF) in dedicated image memory levels (B1, B2,....,BnF).