公开(公告)号：US20240171742A1

公开(公告)日：2024-05-23

申请号：US18056915

申请日：2022-11-18

Applicant: APPLE INC.

Inventor： Alexandros TOUAPIS ,  Yeping SU ,  David SINGER ,  HSI-Jung WU

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60 ,  H04N19/91

CPC classification number: H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60 ,  H04N19/91

Abstract: Video compression and decompression techniques are disclosed that provide improved bandwidth control for video compression and decompression systems. In particular, video coding and decoding techniques quantize input video in multiple dimensions. According to these techniques, pixel residuals may be generated from a comparison of an array of input data to an array of prediction data. The pixel residuals may be quantized in a first dimension. After the quantization, the quantized pixel residuals may be transformed to an array of transform coefficients. The transform coefficients may be quantized in a second dimension and entropy coded. Decoding techniques invert these processes. In still other embodiments, multiple quantizers may be provided upstream of the transform stage, either in parallel or in cascade, which provide greater flexibility to video coders to quantize data in different dimensions in an effort to balance the competing interest in compression efficiency and quality of reconstructed video.