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US 2013/0279822 A1Published application
Multi-Mode Processing of Texture blocks
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorJacob Ström
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Abstract
Multi-mode decoding and encoding of texture blocks are disclosed wherein in a default decoding and encoding mode all bits of a codeword sequence are available as payload bits for representing texel values of the texels in the texture block. In an auxiliary encoding and decoding mode one less bit of the codeword sequence is available as payload bits. The auxiliary mode is employed as a complement to the default mode and will be used to process those texture blocks, which the default mode handles poorly.
Claims6
A multi-mode method of encoding a texture block comprising multiple texels, each texel having a respective texel value, said method comprising:
- defining an auxiliary mode space encompassing bit sequence combinations of a first bit sequence, a second bit sequence, a third bit sequence and a fourth bit sequence where i) an integer value represented by said third bit sequence is larger than an integer value represented by said fourth bit sequence, or ii) said integer value represented by said third bit sequence is equal to said integer value represented by said fourth bit sequence and an integer value represented by said first bit sequence is larger than an integer value represented by said second bit sequence, or iii) said integer value represented by said third bit sequence is equal to said integer value represented by said fourth bit sequence, said integer value represented by said first bit sequence is equal to said integer value represented by said second bit sequence and said integer value represented by said third bit sequence is within a predefined value interval;
- defining a default mode space being complementary to said auxiliary mode space and encompassing bit sequence combinations of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence not encompassed by said auxiliary mode space;
- generating at least one default encoded texture block by representing said texture block with a respective combination of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence selected from said default mode space;
- estimating, for each default encoded texture block of said at least one default encoded texture block, a default error indicative of representing said texture block with said default encoded texture block;
- generating at least one auxiliary encoded texture block by representing said texture block with a respective combination of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence selected from said auxiliary mode space;
- estimating, for each auxiliary encoded texture block of said at least one auxiliary encoded texture block, an auxiliary error indicative of representing said texture block with said auxiliary encoded texture block;
- and
- selecting an encoded texture block resulting in a smallest error from said at least one default encoded texture block and said at least one auxiliary encoded block based on said at least one default error and said at least one auxiliary error.
5 more elements
A multi-mode encoder for encoding a texture block comprising multiple texels, each texel having a respective texel value, wherein said multi-mode encoder comprises:
- an auxiliary generator circuit configured to generate at least one auxiliary encoded texture block by representing said texture block with a respective combination of a first bit sequence, a second bit sequence, a third bit sequence and a fourth bit sequence selected from an auxiliary mode space encompassing bit sequence combinations of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence where i) an integer value represented by said third bit sequence is larger than an integer value represented by said fourth bit sequence, or ii) said integer value represented by said third bit sequence is equal to said integer value represented by said fourth bit sequence and an integer value represented by said first bit sequence is larger than an integer value represented by said second bit sequence, or iii) said integer value represented by said third bit sequence is equal to said integer value represented by said fourth bit sequence, said integer value represented by said first bit sequence is equal to said integer value represented by said second bit sequence and said integer value represented by said third bit sequence is within a predefined value interval;
- an auxiliary estimator circuit configured to estimate, for each auxiliary encoded texture block of said at least one auxiliary encoded texture block generated by said auxiliary generator, an auxiliary error indicative of representing said texture block with said auxiliary encoded texture block;
- a default generator circuit configured to generate at least one default encoded texture block by representing said texture block with a respective combination of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence selected from a default mode space being complementary to said auxiliary mode space and encompassing bit sequence combinations of said first bit sequence, said second bit sequence, said third bit sequence and said fourth bit sequence not encompassed by said auxiliary mode space;
- a default estimator circuit configured to estimate, for each default encoded texture block of said at least one default encoded texture block generated by said default generator circuit, a default error indicative of representing said texture block with said default encoded texture block;
- and
- a block selector circuit configured to select an encoded texture block resulting in a smallest error from said at least one default encoded texture block generated by said default generator circuit and said at least one auxiliary encoded block generated by said auxiliary generator circuit based on said at least one default error estimated by said default estimator circuit and said at least one auxiliary error estimated by said auxiliary estimator circuit.
3 more elements
Dependencies are inferred from the claim text.