H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 1/00 (2006.01) H04N 1/40 (2006.01) H04N 1/405 (2006.01)
Patent
CA 2060291
An image processing apparatus for outputting an image which contains different kinds of multi-level signals for letters, figures, photographs, screened-halftone, etc. The apparatus comprises a screened-halftone pattern detecting circuit and a continuous-tone pattern detecting circuit for detecting a screened-halftone pattern and a continuous-tone pattern, respectively, by using neighboring pixels of the target pixel, counters for counting UP/DOWN in accordance with the outputs of the detecting circuits, a filter for switching the filtering coefficients of the image signal in multiple stages in accordance with the outputs of the counters and a quantizer for bi-level-quantizing the output of the filter. It is thus possible to produce an image having a good quality free from deterioration due to the rapid switching of region judgements and bi-level-quantizing methods.
Gowling Lafleur Henderson Llp
Mitsubishi Denki Kabushiki Kaisha
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