TY - JOUR A1 - Schwarz, Wolfram A1 - Schmidt, Daniel T1 - A test chart for STEREOSCAN 180 by generating grey-scale signals in staircase form JF - Scanning PY - 1978 SN - 0161-0457 SN - 1932-8745 VL - 1 IS - 2 SP - 131 EP - 133 PB - Wiley CY - Hoboken, NJ AN - OPUS4-8950 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -