Electronic image scanner with colour matrix image enhancement

摘要

In an image sensing and processing apparatus for a coloured image, light from a photoresponsive means is sequentially filtered (14) before reaching photoresponsive means to establish in the electrical output signal red, green, blue, yellow, cyan and magenta colour components. Signal processing means (38-46) provide an enhanced red colour component as a function of the red and cyan colour components of the electrical output signal. Similarly an enhanced green colour component is obtained as a function of the green and magenta colour components of the electrical output signal, and an enhanced blue colour component as a function of the blue and yellow components of the electrical output signal. Preferably, each complementary colour is obtained and stored immediately before the primary colour with which it is to be combined, so that only one of the complementary colours is stored at a time. Preferably, the complementary colour image-representing signals are obtained at a lower resolution than the primary colour signals, thereby reducing memory requirements still further.