公开(公告)号：US20150350513A1

公开(公告)日：2015-12-03

申请号：US14292792

申请日：2014-05-30

Applicant: Apple Inc.

Inventor： Xuemei Zhang ,  Marius Tico ,  Yingjun Bai ,  Farhan A. Baqai ,  Fabio Riccardi ,  Juanqing Chen ,  Paul M. Hubel ,  George E. Williams ,  Todd S. Sachs ,  Yongfang Liang

IPC: H04N5/235 ,  H04N5/232 ,  G06T5/00 ,  H04N5/265 ,  H04N5/91 ,  G06K9/46

CPC classification number: H04N5/2355 ,  G06K9/4642 ,  G06K9/4661 ,  G06T5/001 ,  G06T5/009 ,  G06T5/40 ,  G06T2207/10144 ,  G06T2207/20016 ,  G06T2207/20208 ,  G06T2207/20221 ,  H04N5/23245 ,  H04N5/265 ,  H04N5/91

Abstract: Systems, methods, and computer readable media to capture and process high dynamic range (HDR) images when appropriate for a scene are disclosed. When appropriate, multiple images at a single—slightly underexposed—exposure value are captured (making a constant bracket HDR capture sequence) and local tone mapping (LTM) applied to each image. Local tone map and histogram information can be used to generate a noise-amplification mask which can be used during fusion operations. Images obtained and fused in the disclosed manner provide high dynamic range with improved noise and de-ghosting characteristics.

Abstract translation: 公开了适用于场景时捕获和处理高动态范围（HDR）图像的系统，方法和计算机可读介质。 在适当的情况下，捕获单个稍微曝光不足的曝光值的多个图像（使恒定的支架HDR捕获序列）和本地色调映射（LTM）应用于每个图像。 本地色调图和直方图信息可用于生成可在融合操作期间使用的噪声放大掩模。 以所公开的方式获得和融合的图像提供高动态范围，具有改进的噪声和去重影特性。

公开(公告)号：US20150350512A1

公开(公告)日：2015-12-03

申请号：US14292791

申请日：2014-05-30

Applicant: Apple Inc.

Inventor： Juanqing Chen ,  Xuemei Zhang ,  Yingjun Bai

IPC: H04N5/235 ,  H04N5/357 ,  G06T3/40 ,  G06K9/46

CPC classification number: H04N5/2355 ,  G06T3/40 ,  G06T7/0002 ,  G06T2207/10004 ,  G06T2207/20208 ,  G06T2207/30168 ,  H04N5/2351 ,  H04N5/2353 ,  H04N5/243 ,  H04N5/357

Abstract: Systems, methods, and computer readable media for the use of a metric whose value is especially sensitive to the information lost when an image's pixels are clipped are disclosed. The metric may be used as an image's score, where higher values are indicative of lost highlight information (more clipped pixels). One use of the disclosed metric would be to determine when the use of high dynamic range (HDR) techniques are appropriate. The disclosed metric may also be used to bias a scene's exposure value (EV) such as to a lower or underexposed value (EV−) so that the scene may be captured with no more than an acceptable number of clipped pixels.

Abstract translation: 公开了使用度量的系统，方法和计算机可读介质，其度量对于在图像的像素被裁剪时丢失的信息特别敏感。 度量可以用作图像的分数，其中较高的值表示丢失的高亮度信息（更多的剪切的像素）。 所公开的度量的一个用途将是确定何时使用高动态范围（HDR）技术是适当的。 所公开的度量还可以用于将场景的曝光值（EV）偏移到较低或曝光不足的值（EV-），使得可以以不超过可接受数量的限幅像素捕获场景。

公开(公告)号：US20240106976A1

公开(公告)日：2024-03-28

申请号：US17934849

申请日：2022-09-23

Applicant: Apple Inc.

Inventor： Christophe Seyve ,  Xuemei Zhang

IPC: H04N5/783 ,  G06T5/00 ,  G06T5/40 ,  G06V10/74

CPC classification number: H04N5/783 ,  G06T5/002 ,  G06T5/40 ,  G06V10/761

Abstract: Devices, methods, and non-transitory program storage devices are disclosed herein to perform intelligent determinations of non-linear (i.e., dynamic) image recording rates for the production of improved timelapse videos. The techniques described herein may be especially applicable to timelapse videos captured over long durations of time and/or with varying amounts of device motion/scene content change over the course of the captured video (e.g., when a user is walking, exercising, driving, etc. during the video's capture). By smoothly varying the image recording rate of the timelapse video in accordance with multi-temporal scale estimates of scene content change, the quality of the produced timelapse video may be improved (e.g., fewer long stretches of the video with too little action, as well as fewer stretches of the video where there is so much rapid action in the timelapse video that it is difficult for a viewer to perceive what is happening in the video).

公开(公告)号：US10602111B2

公开(公告)日：2020-03-24

申请号：US15697228

申请日：2017-09-06

Applicant: Apple Inc.

Inventor： Yonghui Zhao ,  Xuemei Zhang ,  Yingjun Bai ,  Gregory Guyomarc'h ,  Kosta Dabov

IPC: H04N9/73 ,  H04N5/232 ,  H04N5/235 ,  H04N5/357 ,  H04N5/367 ,  H04N9/68 ,  H04N9/04

Abstract: Techniques for auto white balancing of captured images based on detection of flicker in ambient light is described. When flicker is detected in ambient light during an image capture event, and the flicker is unchanging during the image capture event, a white point of image data may be estimated according to a first technique. When flicker is detected in ambient light during an image capture event, and the flicker is changing during the image capture event, a white point of image data may be estimated according to a second technique. When flicker is not detected, a white point of image data may be estimated according to a third technique. Image data may be color corrected based on the estimated white point.

公开(公告)号：US09892494B2

公开(公告)日：2018-02-13

申请号：US14614568

申请日：2015-02-05

Applicant: Apple Inc.

Inventor： Yingjun Bai ,  Xuemei Zhang

IPC: G06K9/46 ,  G06T5/00 ,  G06T5/40

CPC classification number: G06T5/007 ,  G06T5/40 ,  G06T2207/20016

Abstract: Methods, devices and computer readable instructions to generate region-of-interest (ROI) tone curves are disclosed. One method includes obtaining a statistic for an entire image such as, for example, a luminance statistic. The same statistic may then be found for a specified ROI of the image. A weighted combination of the statistic of the entire image and the statistic of the ROI yields a combined statistic which may then be converted to a ROI-biased tone curve. The weight used to combine the two statistics may be selected to emphasize or de-emphasize the role of the ROI's statistic in the final tone curve.