Koji Aikawa

New image handling technique for a single-pass highlight color copier

The FUJI XEROX Able 1301(alpha) is the first single-pass highlight color copier, that produces two-color copes through a single Xerographic process. The Able 1301(alpha) provides superior copy quality at a low cost through a number of new unique technologies. The color flag method reduces image data size. Instead of using a 16-bit wide data path, the internal image data consists of a 1-bit flag, that represents color (black or color) and 8-bit luminance data. Pulse width modulation (PWM) technology in delay line method uses a high frequency video clock in place of the conventional digital shift clock type PWM. Furthermore, the circuits for the delay line PWM cost less and provide less drift than those for the analog circuit PWM. The line screen forming method enables selective printing with 200 or 400 line screens per inch for photo and text modes using a simple circuit. Finally, the statistical process for background suppression enables background detection and background area calculation to effectively produce copy without high background with various types of originals.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.