Down conversion decoding device of digital television
AssigneeLG Electronics Inc.
InventorSEUNG JONG CHOI
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Abstract
The disclosure is a down conversion decoding device of the digital television having an effect capable of obtaining a picture of the high quality no less than that of the full-memory version while reducing the size of the memory, by changing the size of the required memory according to the type of the frame to be input after the DCT coefficients are horizontally filtered. Furthermore, if the display format is the sequential scanning, there is no need to perform the vertical filtering and decimation for the I and P frames thereby, enhancing the picture quality and also, the format conversion unit can perform the only first interpolation without the additional interlacing process thereby, reducing the size of the memory in the format conversion unit
Claims25
A down conversion decoding device of a digital television comprising:
- an input signal processing unit decoding discrete cosine transform coefficients of bit stream to be input, motion vectors and so on, and performing quantization and inverse discrete cosine transform for given coefficients after inversely scanning said decoded discrete cosine transform coefficients;
- frame storing unit having different sizes according to a characteristic of an input frame, and storing motion compensated frames;
- and
- a motion compensation unit compensating motion of the frame stored in said frame storing unit according to type of motion vectors decoded in said input signal processing unit and inverse discrete cosine transformed frame.
A down conversion decoding device of a digital television comprising:
- an input signal processing unit decoding discrete cosine transform coefficients of bit stream to be input and motion vector, etc., and inversely scanning said decoded discrete cosine transfer coefficients to perform inverse quantization and inverse discrete cosine transfer for given coefficients;
- a frame processing unit having the memory of different sizes according to a characteristic of an input frame, compensating the motion of the frame stored in said memory according to a type of the motion vector decoded in said input signal processing unit and inverse discrete cosine transformed frame to store it in said memory;
- and
- a format selecting unit horizontally filtering the corresponding frame stored in said frame processing unit according to the display format, or, outputting it as it is.
Dependencies are inferred from the claim text.