Document for scanning flat-stored data for processor - is in form of master sheet with scale orientation gray scale and colour values readable to calibrate scanner

摘要

A sheet of material contg. information or symbols is located between the base and a transparent flexible sheet that forms a holder. The transparent foil has a series of lines (11-16) used to control the parameters of the scanning process. By moving the scanner along the lines a grey scale (10) and orientation values (14) may be obtd. that can be used for comparison with those obtd. from the document. Colour values may also be obtd. from top and bottom scales (17, 18) and can be included in the calibration of the hand held scanner.