Method and apparatus for accentuating the features of a monochrome image reproduced by means of a digital transcription

摘要

A method and apparatus for accentuating the features of a monochrome image reproduced by means of a digital transcription. The apparatus includes an analog portion disposed between the digital-to-analog converter DAC (5) and an analog-to-digital converter (15) with analog sampling units (6,7), comparators (10,11,12), a subtractor (9) an amplifier (13) and a limiter to select and calculate the corrective term depending on the difference and on the digital processing means (17,18,19 and 20) to add the corrective terms to the numbers of the digital transcription.