公开(公告)号：US20230188726A1

公开(公告)日：2023-06-15

申请号：US17922306

申请日：2020-06-16

Applicant: Google LLC

Inventor： Vincent Rabaud ,  Maryla Ustarroz-Calonge

IPC: H04N19/149 ,  H04N19/182 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/149 ,  H04N19/182 ,  H04N19/186 ,  H04N19/46

Abstract: Encoding an image includes determining respective costs of coding a symbol using available coding types. A first coding type indicates that a value of the symbol is to be decoded using a same number of bits, and a second coding type indicates that the value of the symbol is to be decoded using a range. An optimal coding type of the available coding types is selected, which corresponds to a smallest cost of the respective costs. A first indicator of the optimal coding type and a first symbol value of the symbol using the optimal coding type are encoded in a compressed bitstream. Decoding an image includes decoding, from a header of a compressed bitstream, respective coding types of symbols encoded in the compressed bitstream and decoding, from the compressed bitstream, respective values of the symbols according to the respective coding types decoded from the header.

公开(公告)号：US20220014773A1

公开(公告)日：2022-01-13

申请号：US17354562

申请日：2021-06-22

Applicant: Google LLC

Inventor： Maryla Ustarroz-Calonge ,  Vincent Rabaud

IPC: H04N19/503 ,  G06T9/00 ,  H04N19/186 ,  H04N19/20 ,  H04N19/44

Abstract: Image coding using alpha channel prediction may include generating a reconstructed image using alpha channel prediction and outputting the reconstructed image. Generating the reconstructed image using alpha channel prediction may include decoding reconstructed color channel values for a current pixel expressed with reference to first color space, obtaining color space converted color channel values for the current pixel by converting the reconstructed color channel values to a second color space, obtaining an alpha channel lower bound for an alpha channel value for the current pixel using the color space converted color channel values, generating a candidate predicted alpha value for the current pixel, obtaining an adjusted predicted alpha value for the current pixel using the candidate predicted alpha value and the alpha channel lower bound, generating a reconstructed pixel for the current pixel using the adjusted predicted alpha value, and including the reconstructed pixel in the reconstructed image.

公开(公告)号：US20230090481A1

公开(公告)日：2023-03-23

申请号：US17994593

申请日：2022-11-28

Applicant: GOOGLE LLC

Inventor： Maryla Ustarroz-Calonge ,  Vincent Rabaud

IPC: H04N19/503 ,  G06T9/00 ,  H04N19/44 ,  H04N19/20 ,  H04N19/186

Abstract: Image coding using alpha channel prediction may include generating a reconstructed image using alpha channel prediction and outputting the reconstructed image. Generating the reconstructed image using alpha channel prediction may include decoding reconstructed color channel values for a current pixel expressed with reference to first color space, obtaining color space converted color channel values for the current pixel by converting the reconstructed color channel values to a second color space, obtaining an alpha channel lower bound for an alpha channel value for the current pixel using the color space converted color channel values, generating a candidate predicted alpha value for the current pixel, obtaining an adjusted predicted alpha value for the current pixel using the candidate predicted alpha value and the alpha channel lower bound, generating a reconstructed pixel for the current pixel using the adjusted predicted alpha value, and including the reconstructed pixel in the reconstructed image.

公开(公告)号：US20220014792A1

公开(公告)日：2022-01-13

申请号：US17354626

申请日：2021-06-22

Applicant: Google LLC

Inventor： Maryla Ustarroz-Calonge ,  Pascal Massimino

IPC: H04N19/86

Abstract: Alpha channel post processing in image coding can include decoding, from multiple color channels of a bitstream, color channel values for an encoded image, decoding, from an alpha channel of the bitstream, alpha channel values for the encoded image, determining a bilateral filter based on a level of compression for encoding the alpha channel, post processing the alpha channel values by filtering the alpha channel values using the bilateral filter to obtain filtered alpha channel values, and generating at least a portion of a reconstructed image corresponding to the encoded image using the filtered alpha channel values and the color channel values.

公开(公告)号：US12167046B2

公开(公告)日：2024-12-10

申请号：US17354626

申请日：2021-06-22

Applicant: Google LLC

Inventor： Maryla Ustarroz-Calonge ,  Pascal Massimino

IPC: H04N19/86

Abstract: Alpha channel post processing in image coding can include decoding, from multiple color channels of a bitstream, color channel values for an encoded image, decoding, from an alpha channel of the bitstream, alpha channel values for the encoded image, determining a bilateral filter based on a level of compression for encoding the alpha channel, post processing the alpha channel values by filtering the alpha channel values using the bilateral filter to obtain filtered alpha channel values, and generating at least a portion of a reconstructed image corresponding to the encoded image using the filtered alpha channel values and the color channel values.

公开(公告)号：US11528498B2

公开(公告)日：2022-12-13

申请号：US17354562

申请日：2021-06-22

Applicant: Google LLC

Inventor： Maryla Ustarroz-Calonge ,  Vincent Rabaud

IPC: H04N19/503 ,  H04N19/186 ,  H04N19/20 ,  H04N19/44 ,  G06T9/00

Abstract: Image coding using alpha channel prediction may include generating a reconstructed image using alpha channel prediction and outputting the reconstructed image. Generating the reconstructed image using alpha channel prediction may include decoding reconstructed color channel values for a current pixel expressed with reference to first color space, obtaining color space converted color channel values for the current pixel by converting the reconstructed color channel values to a second color space, obtaining an alpha channel lower bound for an alpha channel value for the current pixel using the color space converted color channel values, generating a candidate predicted alpha value for the current pixel, obtaining an adjusted predicted alpha value for the current pixel using the candidate predicted alpha value and the alpha channel lower bound, generating a reconstructed pixel for the current pixel using the adjusted predicted alpha value, and including the reconstructed pixel in the reconstructed image.

公开(公告)号：US20230388534A1

公开(公告)日：2023-11-30

申请号：US18448561

申请日：2023-08-11

Applicant: GOOGLE LLC

Inventor： Maryla Ustarroz-Calonge ,  Vincent Rabaud

IPC: H04N19/503 ,  H04N19/186 ,  H04N19/20 ,  H04N19/44 ,  G06T9/00

CPC classification number: H04N19/503 ,  H04N19/186 ,  G06T9/00 ,  H04N19/44 ,  H04N19/20

Abstract: Image coding using alpha channel prediction may include generating a reconstructed image using alpha channel prediction and outputting the reconstructed image. Generating the reconstructed image using alpha channel prediction may include decoding reconstructed color channel values for a current pixel expressed with reference to first color space, obtaining color space converted color channel values for the current pixel by converting the reconstructed color channel values to a second color space, obtaining an alpha channel lower bound for an alpha channel value for the current pixel using the color space converted color channel values, generating a candidate predicted alpha value for the current pixel, obtaining an adjusted predicted alpha value for the current pixel using the candidate predicted alpha value and the alpha channel lower bound, generating a reconstructed pixel for the current pixel using the adjusted predicted alpha value, and including the reconstructed pixel in the reconstructed image.

公开(公告)号：US11765377B2

公开(公告)日：2023-09-19

申请号：US17994593

申请日：2022-11-28

Applicant: GOOGLE LLC

Inventor： Maryla Ustarroz-Calonge ,  Vincent Rabaud

IPC: H04N19/503 ,  H04N19/186 ,  H04N19/20 ,  H04N19/44 ,  G06T9/00

CPC classification number: H04N19/503 ,  G06T9/00 ,  H04N19/186 ,  H04N19/20 ,  H04N19/44

Abstract: Image coding using alpha channel prediction may include generating a reconstructed image using alpha channel prediction and outputting the reconstructed image. Generating the reconstructed image using alpha channel prediction may include decoding reconstructed color channel values for a current pixel expressed with reference to first color space, obtaining color space converted color channel values for the current pixel by converting the reconstructed color channel values to a second color space, obtaining an alpha channel lower bound for an alpha channel value for the current pixel using the color space converted color channel values, generating a candidate predicted alpha value for the current pixel, obtaining an adjusted predicted alpha value for the current pixel using the candidate predicted alpha value and the alpha channel lower bound, generating a reconstructed pixel for the current pixel using the adjusted predicted alpha value, and including the reconstructed pixel in the reconstructed image.