Invention Grant
- Patent Title: Rate control for low latency video encoding and transmission
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Application No.: US17252701Application Date: 2019-06-27
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Publication No.: US11451788B2Publication Date: 2022-09-20
- Inventor: Hao Pan , Jim C. Chou , Felix C. Fernandes
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kowert, Hood, Munyon, Rankin & Goetzel, P.C.
- Agent Robert C. Kowert
- International Application: PCT/US2019/039586 WO 20190627
- International Announcement: WO2020/006287 WO 20200102
- Main IPC: H04N19/146
- IPC: H04N19/146 ; H04L29/06 ; H04N19/14 ; H04N19/169 ; H04N19/176 ; H04N19/63 ; H04L65/60

Abstract:
A video encoding system in which pixel data is decomposed into frequency bands prior to encoding. The frequency bands for a slice of a frame may be buffered so that complexity statistics may be calculated across the frequency bands prior to encoding. The statistics may then be used by a rate control component in determining quantization parameters for the frequency bands for modulating the rate in the encoder for the current slice. The quantization parameters for the frequency bands may be calculated jointly to optimize the quality of the displayed frames after decoder reconstruction and wavelet synthesis on a receiving device. Information about one or more previously processed frames may be used in combination with the statistics for a current slice in determining the quantization parameters for the current slice.
Public/Granted literature
- US20210127117A1 RATE CONTROL FOR LOW LATENCY VIDEO ENCODING AND TRANSMISSION Public/Granted day:2021-04-29
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