Patent ID: 11943442
Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. In a computing system, a method comprising:
receiving encoded data in at least part of a bitstream; and
decoding the encoded data, including:
reconstructing at least part of a slice of a picture, including inverse quantizing transform coefficients for one or more portions of the slice; and
performing deblock filtering on the at least part of the slice, including:
determining a value of a first variable using a chroma quantization parameter (QP) offset and an average of luma QP values for blocks on either side of an edge in the at least part of the slice;
determining a value of a second variable using the value of the first variable in a lookup operation on a first table, the first table mapping possible values of the first variable to corresponding values of the second variable, wherein, for possible values of the first variable above a threshold value, the first table maps the possible values of the first variable to the corresponding values of the second variable using a fixed chroma QP offset;
determining a value of a third variable using the value of the second variable and a control parameter offset;
determining a value of a fourth variable using the value of the third variable in a lookup operation on a second table, the second table mapping possible values of the third variable to corresponding values of the fourth variable; and
determining a value of a control parameter for the deblock filtering using the fourth variable and a bit depth value.