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    Hierarchical mantissa bit length selection for hardware implementation of deep neural network
    1.
    发明授权
    Hierarchical mantissa bit length selection for hardware implementation of deep neural network 有权

    公开(公告)号：US12175349B2

    公开(公告)日：2024-12-24

    申请号：US16180250

    申请日：2018-11-05

    Applicant: Imagination Technologies Limited

    Inventor： James Imber ,  Linling Zhang ,  Cagatay Dikici

    IPC: G06N3/04 ,  G06F7/483 ,  G06F7/499 ,  G06F17/11 ,  G06N3/047 ,  G06N3/048 ,  G06N3/063

    Abstract: Hierarchical methods for selecting fixed point number formats with reduced mantissa bit lengths for representing values input to, and/or output, from, the layers of a DNN. The methods begin with one or more initial fixed point number formats for each layer. The layers are divided into subsets of layers and the mantissa bit lengths of the fixed point number formats are iteratively reduced from the initial fixed point number formats on a per subset basis. If a reduction causes the output error of the DNN to exceed an error threshold, then the reduction is discarded, and no more reductions are made to the layers of the subset. Otherwise a further reduction is made to the fixed point number formats for the layers in that subset. Once no further reductions can be made to any of the subsets the method is repeated for continually increasing numbers of subsets until a predetermined number of layers per subset is achieved.

    Guaranteed data compression
    2.
    发明授权
    Guaranteed data compression 有权

    公开(公告)号：US11309907B2

    公开(公告)日：2022-04-19

    申请号：US17076182

    申请日：2020-10-21

    Applicant: Imagination Technologies Limited

    Inventor： Simon Fenney ,  Linling Zhang

    IPC: H03M7/30 ,  H04N19/103 ,  H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/42

    Abstract: Lossy methods and hardware for compressing data and the corresponding decompression methods and hardware are described. The lossy compression method comprises dividing a block of pixels into a number of sub-blocks and then analysing, for each sub-block, and selecting one of a candidate set of lossy compression modes. The analysis may, for example, be based on the alpha values for the pixels in the sub-block. In various examples, the candidate set of lossy compression modes comprises at least one mode that uses a fixed alpha channel value for all pixels in the sub-block and one or more modes that encode a variable alpha channel value.

    Lossy Data Compression
    3.
    发明申请
    Lossy Data Compression 审中-公开

    公开(公告)号：US20200272333A1

    公开(公告)日：2020-08-27

    申请号：US16872527

    申请日：2020-05-12

    Applicant: Imagination Technologies Limited

    Inventor： Linling Zhang ,  Simon Fenney

    IPC: G06F3/06 ,  H04N19/645 ,  H04N19/34

    Abstract: A lossy method of compressing data, such as image data, which uses wrap-around wavelet compression is described. Each data value is divided into two parts and the first parts, which comprise the most significant bits from the data values, are compressed using wrap-around wavelet compression. Depending upon the target compression ratio and the compression ratio achieved by compressing just the first parts, none, one or more bits from the second parts, or from a data value derived from the second parts, may be appended to the compressed first parts. The method described may be lossy or may be lossless. A corresponding decompression method is also described.

    IMAGE SYNTHESIS
    7.
    发明申请
    IMAGE SYNTHESIS 审中-公开
    图像合成

    公开(公告)号：US20160307338A1

    公开(公告)日：2016-10-20

    申请号：US15131277

    申请日：2016-04-18

    Applicant: Imagination Technologies Limited

    Inventor： Linling Zhang ,  Simon Fenney

    IPC: G06T11/00 ,  G06T15/04

    CPC classification number: G06T11/001 ,  G06T15/04

    Abstract: Image synthesis methods and units are described which can be implemented in real-time on low-cost and mobile devices. A set of sample blocks from an input image are defined. For each combination of sample blocks, a matching block is determined, which provides a best match for that combination when positioned in conjunction with a predetermined arrangement of the sample blocks of the combination. A match table can then be created and stored which includes an indication of the determined matching block for each combination of sample blocks from the input image. The match table can be used to generate a synthesised image, which may be much larger than the input image. For example, the match table may be used to determine an index table which comprises indications of sample blocks to be positioned in a synthesis arrangement for generating the synthesised image.

    Abstract translation: 描述了可以在低成本和移动设备上实时实现的图像合成方法和单元。 定义输入图像的一组采样块。 对于采样块的每个组合，确定匹配块，当与组合的采样块的预定布置相结合时，该匹配块提供了该组合的最佳匹配。 然后可以创建和存储匹配表，其包括来自输入图像的每个采样块组合的确定的匹配块的指示。 匹配表可用于生成可能比输入图像大得多的合成图像。 例如，匹配表可以用于确定索引表，其包括要在用于生成合成图像的合成布置中定位的采样块的指示。

    Lossy data compression
    8.
    发明授权
    Lossy data compression 有权

    公开(公告)号：US11836368B2

    公开(公告)日：2023-12-05

    申请号：US18071454

    申请日：2022-11-29

    Applicant: Imagination Technologies Limited

    Inventor： Linling Zhang ,  Simon Fenney

    IPC: G06F3/06 ,  H04N19/645 ,  H04N19/34

    CPC classification number: G06F3/064 ,  G06F3/0608 ,  G06F3/0673 ,  H04N19/34 ,  H04N19/645

    Abstract: A lossy method of compressing data, such as image data, which uses wrap-around wavelet compression is described. Each data value is divided into two parts and the first parts, which comprise the most significant bits from the data values, are compressed using wrap-around wavelet compression. Depending upon the target compression ratio and the compression ratio achieved by compressing just the first parts, none, one or more bits from the second parts, or from a data value derived from the second parts, may be appended to the compressed first parts. The method described may be lossy or may be lossless. A corresponding decompression method is also described.

    Guaranteed Data Compression
    10.
    发明申请
    Guaranteed Data Compression 有权

    公开(公告)号：US20220209790A1

    公开(公告)日：2022-06-30

    申请号：US17697836

    申请日：2022-03-17

    Applicant: Imagination Technologies Limited

    Inventor： Simon Fenney ,  Linling Zhang

    IPC: H03M7/30 ,  H04N19/103 ,  H04N19/119 ,  H04N19/176 ,  H04N19/186 ,  H04N19/42

    Abstract: Lossy methods and hardware for compressing data and the corresponding decompression methods and hardware are described. The lossy compression method comprises dividing a block of pixels into a number of sub-blocks and then analysing, for each sub-block, and selecting one of a candidate set of lossy compression modes. The analysis may, for example, be based on the alpha values for the pixels in the sub-block. In various examples, the candidate set of lossy compression modes comprises at least one mode that uses a fixed alpha channel value for all pixels in the sub-block and one or more modes that encode a variable alpha channel value.

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