Picture signal interpolation circuit with gamma compensation
First Claim
1. Picture signal interpolation circuit, comprising:
- means for receiving a picture signal encoded in accordance with a field skipping method, andmeans coupled to said receiving means for interpolating said picture signal to obtain interpolated fields between a plurality of received fields of said picture signal, wherein said picture signal interpolation circuit is provided with a gamma compensation circuit.
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Accused Products
Abstract
A picture signal source (PSS) comprises an encoding circuit (ENC) for encoding a picture signal having a higher bandwidth to a picture signal having a lower bandwidth. Encoding is effected in dependence upon the extent of motion in the picture which is determined by a motion detection device (MOT). An encoding has been given as an example, using several picture signal channels (PC1, PC2, PC3) each having a different picture signal refreshing period of, for example 80, 20 or 40 ms. The so-called field skipping method is used for which a switching circuit (SC4) switching at the frame frequency is provided. The picture display device (PDD) comprises an essentially complementary, inversely operative decoding circuit (DEC) with a motion-compensated (VR'"'"') picture signal interpolation circuit (MEM, INT, G) which comprises a gamma compensation circuit (G) according to the invention. Without this circuit a troublesome area flickering may occur upon display in practice. The gamma compensation circuit (G) counteracts the area flickering which is caused by a combination of the act that the picture signal is gamma-corrected (COR.γ.), the use of the field skipping method (SC4) and the presence of considerable pixel contrasts.
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Citations
10 Claims
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1. Picture signal interpolation circuit, comprising:
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means for receiving a picture signal encoded in accordance with a field skipping method, and means coupled to said receiving means for interpolating said picture signal to obtain interpolated fields between a plurality of received fields of said picture signal, wherein said picture signal interpolation circuit is provided with a gamma compensation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification