Title:
DEVICE AND METHOD FOR CONTROLLING CATHODE-RAY TUBE
Document Type and Number:
Japanese Patent JP3906773
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a cathode-ray tube controller which makes an improvement for excellent sharpness by suppressing occurrence of ringing even when there is a variation in luminance changes in an edge.
SOLUTION: A start edge and an end edge of a black level part and a start edge and an end edge of a white level part of an input image signal are respectively detected. When the variation of a luminance value meets a prescribed condition about each of detected edges, a partial modulation signal for each edge is generated. Partial modulation signals obtained from the start edge and the end edge of the white level part are outputted while maintaining a temporal context of each other as they are. Partial modulation signals obtained from the start edge and the end edge of the black level part are outputted while the partial modulation signal obtained from the start edge is temporally moved behind and the partial modulation signal obtained from the end edge is temporally moved ahead in order to expand a black level area of an image.
Inventors:
Akinaga Jinko
Hatano Shinritsu
Hatano Shinritsu
Application Number:
JP2002283097A
Publication Date:
April 18, 2007
Filing Date:
September 27, 2002
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04N5/208; G09G1/00; H04N3/32; (IPC1-7): H04N5/208; G09G1/00; H04N3/32
Domestic Patent References:
| JP8340461A | ||||
| JP6303451A | ||||
| JP7129110A | ||||
| JP5119731A |
Attorney, Agent or Firm:
Shogo Takahashi
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
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