Title:
ビデオ画像におけるエラー検出検出方法および検出装置
Document Type and Number:
Japanese Patent JP3844490
Kind Code:
B2
Abstract:
An error is identified in a video image by calculating frequency-related coefficients for blocks of the image and considering the statistical distribution of said coefficients. The variance of coefficients is calculated and a block of original image data is concealed if the variance calculated is significantly higher than a stored threshold and/or if said variance calculated is significantly different from variance values derived for similarly positioned blocks within a previous frame. Concealment is effected by selecting image data from a previous frame, displaced in response to transmitted motion vectors.
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Inventors:
Murphy, Angela Ruth
Gumby, Stephen Richard
Gumby, Stephen Richard
Application Number:
JP50500195A
Publication Date:
November 15, 2006
Filing Date:
July 19, 1994
Export Citation:
Assignee:
British Telecommunications Public Limited Company
International Classes:
H03M7/30; H04N19/89
Domestic Patent References:
| JP62086922A | ||||
| JP2172388A | ||||
| JP3085820A | ||||
| JP4061070A | ||||
| JP4072985A | ||||
| JP6070306A |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Ryo Hashimoto
Hanawa Yoshio
Sadao Muramatsu
Ryo Hashimoto
Hanawa Yoshio