Color image array scanner with high resolution monochrome mode

Details Color image array scanner with high resolution monochrome mode Color image array scanner with high resolution monochrome mode

1994-10-31

1996-05-28

Metjahic, Safet

Television

Camera, system and detail

With single image scanning device supplying plural color...

348247, 348281, H04N 904

Patent

active

055216404

ABSTRACT:
A solid-state array scanner with a color filter at each pixel sensor is provided to accomplish color scanning of color images with a set of pixels sensors for each color pixel. In addition, a scaler device is provided for selectively scaling the output pixel signal from each pixel sensor to correct for color filter loss when scanning black/white images. Thus, while a set of pixel signals must be combined for each color pixel in color mode scanning, in mono mode scanning of black/white images, the pixel signal from each pixel signal may be used. An address means selectively addresses each solid-state pixel sensor device in the array for readout of the illumination intensity, or pixel signal, sensed by that device. Each pixel sensor will have a given color filter dependent upon the sensor's location in the array. From the address of the pixel sensor, the scaler value to compensate for the color filter in mono mode can be selected. The scaling compensation can be accomplished by changing the reference voltage used in an analog-to-digital (A/D) converter that converts the pixel signals from the analog array output of the pixel sensors to digital values. Alternatively, the scaling compensation can be accomplished by multiplying a digital scaling factor times the pixel digital intensity value from each pixel sensor. Also, the scaling compensation can be accomplished by a programmed digital signal processor.

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