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    Text and line detection in video encode by using co-sited gradient and variance values
    4.
    发明授权
    Text and line detection in video encode by using co-sited gradient and variance values 有权

    公开(公告)号：US11490090B2

    公开(公告)日：2022-11-01

    申请号：US17138812

    申请日：2020-12-30

    申请人： ATI Technologies ULC

    发明人： Mehdi Saeedi ,  Sai Harshita Tupili ,  Yang Liu ,  Mingkai Shao ,  Gabor Sines

    IPC分类号： H04N19/136 ,  H04N19/103 ,  H04N19/172

    摘要： Methods and devices are provided for encoding video. By using co-sited gradient and variance values to detect text and line in frames of the video. A processor is configured to receive a plurality of frames of video, determine, for a portion of a frame, a variance of the portion of the frame and a gradient of the portion of the frame and encode, using one of a plurality of different encoding qualities, the portion of the frame based on the gradient and the variance of the portion of the frame. Encoding is performed at both the sub-frame level and frame level. The portion of the frame is classified into one of a plurality of categories based on the gradient and variance and encoded based on the category.

    TEXT AND LINE DETECTION IN VIDEO ENCODE BY USING CO-SITED GRADIENT AND VARIANCE VALUES
    7.
    发明申请
    TEXT AND LINE DETECTION IN VIDEO ENCODE BY USING CO-SITED GRADIENT AND VARIANCE VALUES 有权

    公开(公告)号：US20220210429A1

    公开(公告)日：2022-06-30

    申请号：US17138812

    申请日：2020-12-30

    申请人： ATI Technologies ULC

    发明人： Mehdi Saeedi ,  Sai Harshita Tupili ,  Yang Liu ,  Mingkai Shao ,  Gabor Sines

    IPC分类号： H04N19/136 ,  H04N19/172 ,  H04N19/103

    摘要： Methods and devices are provided for encoding video. By using co-sited gradient and variance values to detect text and line in frames of the video. A processor is configured to receive a plurality of frames of video, determine, for a portion of a frame, a variance of the portion of the frame and a gradient of the portion of the frame and encode, using one of a plurality of different encoding qualities, the portion of the frame based on the gradient and the variance of the portion of the frame. Encoding is performed at both the sub-frame level and frame level. The portion of the frame is classified into one of a plurality of categories based on the gradient and variance and encoded based on the category.

    Content adaptive quantization strength and bitrate modeling
    8.
    发明授权
    Content adaptive quantization strength and bitrate modeling 有权

    公开(公告)号：US11368692B2

    公开(公告)日：2022-06-21

    申请号：US16177128

    申请日：2018-10-31

    申请人： ATI Technologies ULC

    发明人： Jinbo Qiu ,  Yang Liu ,  Ihab Amer ,  Lei Zhang ,  Edward A. Harold ,  Zhiqi Hao ,  Jiao Wang ,  Gabor Sines ,  Haibo Liu ,  Boris Ivanovic

    IPC分类号： H04N19/124 ,  H04N19/176 ,  H04N19/172

    摘要： Systems, apparatuses, and methods for generating a model for determining a quantization strength to use when encoding video frames are disclosed. A pre-encoder performs multiple encoding passes using different quantization strengths on a portion or the entirety of one or more pre-processed video frames. The pre-encoder captures the bit-size of the encoded output for each of the multiple encoding passes. Then, based on the multiple encoding passes, the pre-encoder generates a model for mapping bit-size to quantization strength for encoding video frames or portion(s) thereof. When the encoder begins the final encoding pass for one or more given video frames or any portion(s) thereof, the encoder uses the model to map a preferred bit-size to a given quantization strength. The encoder uses the given quantization strength when encoding the given video frame(s) or frame portion(s) to meet a specified bit-rate for the encoded bitstream.

    Hierarchical histogram calculation with application to palette table derivation
    10.
    发明授权
    Hierarchical histogram calculation with application to palette table derivation 有权

    公开(公告)号：US11076151B2

    公开(公告)日：2021-07-27

    申请号：US16588772

    申请日：2019-09-30

    申请人： ATI Technologies ULC

    发明人： Feng Pan ,  Wei Gao ,  Yang Liu ,  Crystal Yeong-Pian Sau ,  Haibo Liu ,  Edward A. Harold ,  Ying Luo ,  Ihab Amer ,  Gabor Sines

    IPC分类号： H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/115

    摘要： Systems, apparatuses, and methods for calculating multi-pass histograms for palette table derivation include an encoder that calculates a first histogram for a first portion of most significant bits (MSBs) of pixel component values of a block of an image or video frame. Then, the encoder selects a given number of the highest pixel count bins from the first histogram. The encoder then increases the granularity of these selected highest pixel count bins by evaluating one or more additional bits from the pixel component values. A second histogram is calculated for the concatenation of the original first portion MSBs from the highest pixel count bins and the one or more additional bits, and the highest pixel count bins are selected from the second histogram. A palette table is derived based on these highest pixel count bins selected from the second histogram, and the block is encoded using the palette table.