Granted Patent B2

US 12,335,505 · App. 17/789,993 · Granted Jun 17, 2025

Inventors: Phan Hoang Tung Nguyen (Berlin, DE); Benjamin Bross (Berlin, DE); Heiko Schwarz (Berlin, DE); Detlev Marpe (Berlin, DE); Thomas Wiegand (Berlin, DE)

Assignee: FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

H04N19/46H04N19/174H04N19/176

Abstract

Claims (33)

1. A video decoder comprising:

a microprocessor; and

a memory, the memory having program code that, when executed by the microprocessor, causes the video decoder to:

decode, from a video bitstream, a high-level flag which, when set to a first value, indicates performing regular residual coding (RRC) for all coding units of a specific area of a current picture;

determine, from the video bitstream, for a transform block ( 84 ), whether an inverse transform corresponding to the transform block is an identity transform or not;

when it is determined that the inverse transform is the identity transform and the high-level flag is set to a second value different from the first value, determine a first Rice parameter for a binarization of a residual transform coefficient of the transform block;

when it is determined that the inverse transform is not the identity transform or the high-level flag is set to the first value, determine a second Rice parameter for the binarization of the residual transform coefficient of the transform block; and

decode the residual transform coefficient of the transform block using the first or second Rice parameter.

2. A video encoder comprising:

a microprocessor; and

a memory, the memory having program code that, when executed by the microprocessor, causes the video encoder to:

encode, into a video bitstream, a high-level flag which, when set to a first value, indicates performing regular residual coding (RRC) for all coding units of a specific area of a current picture;

signal, in the video bitstream for a transform block, whether an inverse transform corresponding to the transform block is an identity transform;

when the inverse transform is the identity transform and the high-level flag is set to a second value different from the first value, determine a first Rice parameter for a binarization of a residual transform coefficient of the transform block;

when the inverse transform is not the identity transform or the high-level flag is set to the first value, determine a second Rice parameter for the binarization of the residual transform coefficient of the transform block; and

encode the residual transform coefficient of the transform block using the first or second Rice parameter.

3. The video encoder of claim 2 , wherein the memory has program code that, when executed by the microprocessor, causes the video encoder to:

determine that content for the video bitstream is camera-captured content; and

based on the determination that the content for the video bitstream is camera-captured content, set the high-level flag to the first value.

4. The video encoder of claim 2 , wherein the memory has program code that, when executed by the microprocessor, causes the video encoder to:

determine that content for the video bitstream is screen content; and

based on the determination that content for the video bitstream is screen content, set the high-level flag to the second value.

5. A method of video decoding, the method comprising:

decoding, from a video bitstream, a high-level flag which, when set to a first value, indicates performing regular residual coding (RRC) for all coding units of a specific area of a current picture;

determining from the video bitstream, for a transform block, whether an inverse transform corresponding to the transform block is an identity transform;

when it is determined that the inverse transform is the identity transform and the high-level flag is set to a second value different from the first value, determining a first Rice parameter for a binarization of a residual transform coefficient of the transform block;

when it is determined that the inverse transform is not the identity transform or the high-level flag is set to the first value, determining a second Rice parameter for the binarization of the residual transform coefficient of the transform block; and

decoding the residual transform coefficient of the transform block using the first or second Rice parameter.

6. A non-transitory, computer-readable storage medium storing computer program instructions, which when executed, cause a decoder to perform the steps of: decoding, from a video bitstream, a high-level flag which, when set to a first value, indicates performing regular residual coding (RRC) for all coding units of a specific area of a current picture;

determining from the video bitstream, for a transform block, whether an inverse transform corresponding to the transform block is an identity transform;

when it is determined that the inverse transform is the identity transform and the high-level flag is set to a second value different from the first value, determining a first Rice parameter for a binarization of a residual transform coefficient of the transform block;

when it is determined that the inverse transform is not the identity transform or the high-level flag is set to the first value, determining a second Rice parameter for the binarization of the residual transform coefficient of the transform block; and

decoding the residual transform coefficient of the transform block using the first or second Rice parameter.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (12)