Arm Limited

John Nils Andreas Bjorklund

Sven Ola Johannes Hugosson

Fredrik Peter Stolt

When encoding an array of data elements using an encoding process that generates an array of quantized frequency domain coefficients corresponding to an array of difference values between a source block of data elements of the array of data elements being encoded and a reference block of data elements, a bit count value for encoding an array of quantized frequency domain coefficients to be used to select whether to encode the source block in accordance with a particular set of encoding options is estimated by estimating a bit count value for encoding the locations of the non-zero quantized frequency domain coefficients in the array of quantized frequency domain coefficients based on the number of non-zero frequency domain coefficients in the array of quantized frequency domain coefficients.

Selecting encoding options

When encoding an array of data elements of a stream of arrays of data elements, a set of sample adaptive offset options to be used for encoding the array are selecting on the basis of a distortion value that is determined for a particular set of sample adaptive offset options. The distortion value is determined by generating one or more filtered reconstructed source blocks by applying a sample adaptive offset filter in accordance with the particular set of sample adaptive offset options to one or more reconstructed source blocks corresponding to a source block, and by then determining a distortion value for the particular set of sample adaptive offset options by comparing the one or more filtered reconstructed source blocks with the source block. When the particular set of sample adaptive offset options comprises an edge offset type, the distortion value is determined using a set of error values comprising fewer data elements than the source block of data elements.

Data processing systems for encoding video data

When encoding an array of quantized frequency domain coefficients for the chrominance data values for a block of data elements being encoded, it is determined whether the encoding of the frequency domain coefficients for the luminance data for the block being considered was indicated as to be omitted. If so, it is then determined whether the non-zero coefficients in the array of quantized chrominance data value frequency domain coefficients for the block are few in number and/or small in size. If the number and/or size of the non-zero quantized chrominance value frequency domain coefficients is determined to be sufficiently few and/or small, then the encoding of the quantized frequency domain coefficients for the chrominance data for the block is omitted.

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Lund, Sweden

John Nils Andreas Bjorklund