Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and method for efficiently detecting errors in one-hot words, which have only a single bit set in the absence of errors. SOLUTION: According to an embodiment of the invention, an apparatus is provided which includes a plurality of input signal lines, a plurality of switching devices, a plurality of intermediate signal lines, and logic circuitry. The switching devices are connected to the input signal lines. The intermediate signal lines are also connected to the switching devices. The connection is in such a way that when a particular input signal line is set, all intermediate signal lines connected by a switching device to that particular input signal lines are forced to a predetermined logic state. The intermediate signal lines are input to the logic circuitry, which outputs a signal indicative of whether at least two of the plurality of input signal lines are set. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
Color printheads in a color inkjet printer are in a fixed order in the scanning carriage, which causes the colors to be printed in a different order when the carriage is scanned in an opposite direction. The different print order may result in a perceptible change in hue between passes in bi-directional printing. Depleted shingle masks are substituted for the nominal ones, based on print direction, at the shingle masking stage, to compensate for print-direction- induced hue shift. A look-up table indexed by a composite color tone value providing a depletion probability and a halftoning error diffusion value are used in determining when depleted shingle masks are to be invoked.