公开(公告)号：US20240153055A1

公开(公告)日：2024-05-09

申请号：US18501976

申请日：2023-11-03

Applicant: Apple Inc.

Inventor： Nicolas P. BONNIER ,  Jackson K. ROLAND

IPC: G06T5/00 ,  G06T9/00 ,  G06V10/60

CPC classification number: G06T5/009 ,  G06T9/00 ,  G06V10/60 ,  G06T2207/20208

Abstract: This application describes techniques for preprocessing images to improve gain map compression outcomes. A gain map can be generated by comparing a first image to a second image and subsequently compressed to form a compressed gain map. The compressed gain map can combined with a compressed version of the first image to form a compressed enhanced image. The compressed enhanced image can be later uncompressed to generate an uncompressed version of the first image and the gain map applied to the uncompressed version of the first image to generate a version of the second image to provide for reproduction on a target display. The compressed version of the first image and the compressed gain map can be generated separately by an image compression module and a gain map compression module or jointly by a combined gain map generation and compression module.

公开(公告)号：US20250124555A1

公开(公告)日：2025-04-17

申请号：US18900476

申请日：2024-09-27

Applicant: Apple Inc.

Inventor： Ching E. HO ,  Jackson K. ROLAND ,  Nicolas P. BONNIER

IPC: G06T5/92 ,  G06T5/50

Abstract: Disclosed are various techniques for generating image specific global tone curves and residual gain maps based on multiple images. A gain map is generated based on a comparison of a first image to a second image. A gain map scatter plot is constructed based on the gain map values and channel values of either the first image or the second image. An image specific global tone curve is determined by curve fitting to the gain map scatter plot. A residual gain map is generated based on a comparison of the gain map to a reconstructed gain map derived from the image specific global tone curve. An approximation of the second image can be constructed using the image specific global tone curve and the first image. A replica of the second image can be constructed using the image specific global tone curve, the residual gain map, and the first image.

公开(公告)号：US20240153054A1

公开(公告)日：2024-05-09

申请号：US18501973

申请日：2023-11-03

Applicant: Apple Inc.

Inventor： Nicolas P. BONNIER ,  Jackson K. ROLAND

IPC: G06T5/00 ,  G06T11/60 ,  G06V10/74

CPC classification number: G06T5/009 ,  G06T11/60 ,  G06V10/761 ,  G06T2207/20208

Abstract: Disclosed are various techniques for utilizing gain maps. According to some embodiments, one technique for utilizing a gain map comprises (1) accessing an enhanced image that includes a high dynamic range (HDR) image and the gain map, (2) extracting the HDR image and the gain map from the enhanced image, (3) generating a standard dynamic range (SDR) image using the HDR image and the gain map, (4) receiving and applying first modification instructions against the HDR image, (5) generating second modification instructions based on at least the first modification instructions, (6) applying the second modification instructions to the SDR image, (7) generating a second gain map by comparing the HDR image against the SDR image or vice-versa, and (8) embedding the second gain map into the HDR image or the SDR image.

公开(公告)号：US20240153053A1

公开(公告)日：2024-05-09

申请号：US18501972

申请日：2023-11-03

Applicant: Apple Inc.

Inventor： Nicolas P. BONNIER ,  Jackson K. ROLAND

IPC: G06T5/00

CPC classification number: G06T5/009 ,  G06T2207/20208

Abstract: Disclosed are various techniques for generating gain maps. According to some embodiments, one technique for generating a gain map includes the steps of (1) accessing a high dynamic range (HDR) image, (2) accessing a standard dynamic range (SDR) image, (3) for each pixel shared between the HDR and SDR images: plotting the pixel onto a graph, wherein an HDR value of the pixel is plotted on a Y-axis of the graph and an SDR value of the pixel is plotted on an X-axis of the graph, (4) establishing a first curve that represents an approximation of the plotted pixels, (5) inverting the first curve to establish a second curve, (6) applying the second curve against the plotted pixels to establish replotted pixels, (7) generating the gain map based on the replotted pixels, and (8) embedding the gain map into the HDR image.