发明名称 |
FOERFARANDE ATT AENDRA EN VISFREKVENS AV EN VIDEOSIGNAL. |
摘要 |
The invention relates to a method wherein it is possible, by digital signal processing taking place in the receiver, to reduce errors caused in a television picture by an interlaced transmission standard and a low field frequency. The transmitted interlaced (50 Hz/2:1) signal is converted in the receiver either to a non-interlaced (50 Hz/1:1) signal or to an interlaced (100 Hz/2:1) signal. The higher display frequency transfers the errors to higher frequencies, whereupon they no longer disturb the viewer. The conversion takes place by means of a weighted median filter operating in a 3*3 window. In the window, the first line is from the preceding field in the memory and the two others are from the latest received field. The filter interpolates a new dot according to these data. The structure of the filter selects implicitly temporal interpolation in a stationary picture and spatial interpolation for moving objects. By altering the coefficients of the weighted median filter it is possible to optimize the filter to operate either in a moving picture or in a stationary picture. The method can be carried out using a VLSI circuit. <IMAGE> |
申请公布号 |
FI81232(B) |
申请公布日期 |
1990.05.31 |
申请号 |
FI19880005725 |
申请日期 |
1988.12.09 |
申请人 |
SALORA OY |
发明人 |
JUHOLA, JANNE;NIEMINEN, ARI;SALO, JUHA;NEUVO, YRJOE |
分类号 |
H04N5/44;H04N7/26;H04N7/46;(IPC1-7):H04N7/01;H04N11/00 |
主分类号 |
H04N5/44 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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