A commercial color scanner with high resolution is used for picture processing. The scanner is modified and additional electronic instruments are connected to the built-in color computer. The operations are carried out in an on-line process, simultaneously with the scan of the picture a processed picture is recorded on a special scanner film. Because there is no storage of image datas short processing times are obtained. The image datas are handled in a color computer, a gradation processor, an operational amplifier and a comparator to realize various' procedures of picture operations.
The procedures are classified here in global, local and point operations. Global operations refer to the whole picture, these are for instance "rectification, enlargement, density transformations. Local operations are mostly used for texture and pattern recognition and are related to the scanned picture element and its surrounding area. Point operations manipulate the information of a single picture element. The scanner generates three color signals from each picture element, which are handled in the color computer for color and signature recognition.
Several operations may be carried out in the same scan. The processed picture is displayed on a b/w transparency or on a color film. A suitable display for thematic mapping is essential for a correct interpretation of the processed picture.
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