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公开(公告)号：US09380218B2
公开(公告)日：2016-06-28
申请号：US14292791
申请日：2014-05-30
Applicant: Apple Inc.
Inventor： Juanqing Chen , Xuemei Zhang , Yingjun Bai
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。
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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
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。
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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
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。
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