Device and method for converting video format of digital tv
AssigneeLe Electronics Inc.
InventorSang Hoon Choi
Life of this patent
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Abstract
Device and method for converting a video format of a digital T.V. which can convert an SD video into an HD video, the device including a VLD for making a variable length decoding of a received bit stream to determine a received video source of being an SD video and provide a relevant signal according to a result of the determination, a detector for detecting existence of edge components of the SD image using inverse quantized DCT coefficients, and a format converter for interpolating and format converting an SD image data obtained by adding an IDCT SD image data and a motion compensated SD image data into an HD image data by applying an interpolation equation according to signal from the VLD and the detector, whereby distortion of the image and degradation of a picture quality are prevented.
Claims10
A device for converting a video format of a digital TV, the device having an inverse quantizer, an IDCT (Inverse Discrete Cosine Transformation) and motion compensator, the device comprising:
- a detector for detecting existence of edge components from an SD image data and providing a relevant signal, accordingly;
- and,
- a format converter for interpolating and format converting an SD image data obtained by adding an SD image data from the IDCT and an SD image data from the motion compensator according to an output from the detector,
- wherein said format converter interpolates using an interpolation equation according to the relevant signal provided by the detector, the interpolation equation is,
- a′=(c1*a+c2*b)/(c1+c2) and
- b′=(c2*a+c1*b)/(c1+c2),
- where, “a” and “b” denote actual pixels, “a′” and “b′” denote pixels after the interpolation, and c1 and c2 are interpolation coefficients, and the interpolation coefficients c1 and c2 are varied depending on a number of non-zero DCT coefficients.
A method for converting a video format of a digital TV having an inverse quantizer, the method comprising the steps of:
- (1) detecting existence of edge components in an SD image data from the inverse quantizer;
- and,
- (2) interpolating the SD image data by using an interpolation equation according to a result of detection in the step (1), to make a format conversion of the SD image data into an HD image data,
- wherein the interpolation equation applied when the edge components exist in the SD image data is,
- a′=(c1*a+c2*b)/(c1+c2) and
- b′=(c2*a+c1*b)/(c1+c2),
- where, “a” and “b” denote actual pixels, “a′” and “b′” denote pixels after the interpolation, and c1 and c2 are interpolation coefficients, and the interpolation coefficients c1 and c2 are varied depending on a number of non-zero DCT coefficients.
Dependencies are inferred from the claim text.