Encoder, decoder, methods and computer programs with an improved transform based scaling
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsBenjamin BROSS, Phan Hoang Tung NGUYEN, Heiko SCHWARZ, Detlev MARPE, Thomas WIEGAND
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Abstract
Decoder for block-based decoding of an encoded picture signal using transform decoding, configured to select for a predetermined block a selected transform mode, entropy decode a block to be dequantized, which is associated with the predetermined block according to the selected transform mode, from a data stream and dequantize the block to be dequantized using a quantization accuracy, which depends on the selected transform mode, to obtain a dequantized block.
Claims36
Encoder for block-based encoding of a picture signal using transform coding, configured to:
- select for a predetermined block a selected transform mode;
- quantize a block to be quantized, which is associated with the predetermined block according to the selected transform mode, using a quantization accuracy, which depends on the selected transform mode, to acquire a quantized block;
- and
- entropy encode the quantized block into a data stream.
Decoder for block-based decoding of an encoded picture signal using transform decoding, configured to:
- select for a predetermined block a selected transform mode;
- entropy decode a block to be dequantized, which is associated with the predetermined block according to the selected transform mode, from a data stream;
- dequantize the block to be dequantized using a quantization accuracy, which depends on the selected transform mode, to acquire a dequantized block.
Method for block-based encoding of a picture signal using transform coding, comprising:
- selecting for a predetermined block a selected transform mode;
- quantizing a block to be quantized, which is associated with the predetermined block according to the selected transform mode, using a quantization accuracy, which depends on the selected transform mode, to acquire a quantized block;
- and
- entropy encoding the quantized block into a data stream.
Method for block-based decoding of an encoded picture signal using transform decoding, comprising:
- selecting for a predetermined block a selected transform mode;
- entropy decoding a block to be dequantized, which is associated with the predetermined block according to the selected transform mode, from a data stream;
- dequantizing the block to be dequantized using a quantization accuracy, which depends on the selected transform mode, to acquire a dequantized block.
A non-transitory digital storage medium having a computer program stored thereon to perform the method for block-based encoding of a picture signal using transform coding, comprising:
- selecting for a predetermined block a selected transform mode;
- quantizing a block to be quantized, which is associated with the predetermined block according to the selected transform mode, using a quantization accuracy, which depends on the selected transform mode, to acquire a quantized block;
- and
- entropy encoding the quantized block into a data stream,
- when said computer program is run by a computer.
A non-transitory digital storage medium having a computer program stored thereon to perform the method for block-based decoding of an encoded picture signal using transform decoding, comprising:
- selecting for a predetermined block a selected transform mode;
- entropy decoding a block to be dequantized, which is associated with the predetermined block according to the selected transform mode, from a data stream;
- dequantizing the block to be dequantized using a quantization accuracy, which depends on the selected transform mode, to acquire a dequantized block,
- when said computer program is run by a computer.
Data stream acquired by a method for block-based encoding of a picture signal using transform coding, comprising:
- selecting for a predetermined block a selected transform mode;
- quantizing a block to be quantized, which is associated with the predetermined block according to the selected transform mode, using a quantization accuracy, which depends on the selected transform mode, to acquire a quantized block;
- and
- entropy encoding the quantized block into a data stream.
Data stream acquired by a method for block-based decoding of an encoded picture signal using transform decoding, comprising:
- selecting for a predetermined block a selected transform mode;
- entropy decoding a block to be dequantized, which is associated with the predetermined block according to the selected transform mode, from a data stream;
- dequantizing the block to be dequantized using a quantization accuracy, which depends on the selected transform mode, to acquire a dequantized block.
Dependencies are inferred from the claim text.