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1.发明授权公开(公告)号：US09667842B2
公开(公告)日：2017-05-30
申请号：US14474103
申请日：2014-08-30
申请人： Apple Inc.
发明人： Farhan A. Baqai , Claus Molgaard , Fabio Riccardi , Xuemei Zhang
CPC分类号： H04N5/217 , G06T5/002 , G06T5/008 , G06T2207/20012 , G06T2207/20016 , G06T2207/20048 , H04N9/045
摘要： Image enhancement is achieved by separating image signals, e.g. YCbCr image signals, into a series of frequency bands and performing locally-adaptive noise reduction on bands below a given frequency but not on bands above that frequency. The bands are summed to develop the image enhanced signals. The YCbCr, multi-band locally-adaptive approach to denoising is able to operate independently—and in an optimized fashion—on both luma and chroma channels. Noise reduction is done based on models developed for both luma and chroma channels by measurements taken for multiple frequency bands, in multiple patches on the ColorChecker chart, and at multiple gain levels, in order to develop a simple yet robust set of models that may be tuned off-line a single time for each camera and then applied to images taken by such cameras in real-time without excessive processing requirements and with satisfactory results across illuminant types and lighting conditions.
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公开(公告)号：US20160360068A1
公开(公告)日：2016-12-08
申请号：US14872114
申请日：2015-09-30
申请人： Apple Inc.
发明人： Yingjun Bai , Xuemei Zhang
CPC分类号： H04N1/6061 , G06T11/00 , G06T11/001
摘要： A gamut size metric for use in all phases of color image processing (e.g., capture, transmission, and display) is described. In general, techniques are disclosed for determining a single-valued metric that changes as image content changes. More particularly, techniques disclosed herein may be used to efficiently determine a gamut boundary histogram which may be used to estimate a gamut size metric. A gamut size metric as disclosed herein identifies a minimum size gamut needed to encompass each pixel in an image, where the gamut size is limited at one end by a first device independent gamut (S1), and at another end by a second device independent color space (S2), where S1 is wholly enclosed within S2. The described gamut size metric may be based on strict pixel color value differences. In other embodiments the gamut size metric may take into effect perceptual color differences and significance.
摘要翻译： 描述了用于彩色图像处理（例如，捕获，传输和显示）的所有阶段的色域尺寸度量。 通常，公开了用于确定随着图像内容改变而改变的单值度量的技术。 更具体地，可以使用本文公开的技术来有效地确定可用于估计色域尺寸度量的色域边界直方图。 如本文所公开的色域尺寸度量标识包围图像中的每个像素所需的最小尺寸色域，其中色域尺寸在一端被第一设备独立色域（S1）限制，另一端由第二设备独立色彩限制 空间（S2），其中S1完全封闭在S2内。 所描述的色域尺寸度量可以基于严格的像素颜色值差异。 在其他实施例中，色域尺寸度量可以实现感知色差和显着性。
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公开(公告)号：US11488374B1
公开(公告)日：2022-11-01
申请号：US16578825
申请日：2019-09-23
申请人： Apple Inc.
发明人： Wei Sun , Jun Hu , Marius Tico , Xuemei Zhang
摘要： The disclosure pertains to techniques for image processing. One such technique comprises a method for image selection, comprising obtaining a sequence of images, detecting one or more objects in one or more images of the sequence of images, determining a location for each detected object in the one or more images, determining a trajectory for each detected object based on a determined location for each respective detected object in two or more images of the sequence of images, determining a trajectory waypoint score for the trajectory of each detected object, determining a set of selected images based on an aggregation of trajectory waypoint scores for each detected object in each respective image, and outputting the set of selected images for presentation.
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公开(公告)号：US20170272780A1
公开(公告)日：2017-09-21
申请号：US15070620
申请日：2016-03-15
申请人： Apple Inc.
发明人： Hao Pan , Yingjun Bai , Xuemei Zhang , Haitao Guo , Munehiro Nakazato , Xiaohua Yang
IPC分类号： H04N19/86 , H04N19/44 , H04N19/186 , H04N19/12 , H04N19/156
CPC分类号： H04N19/86 , H04N1/6058 , H04N19/12 , H04N19/156 , H04N19/186 , H04N19/44 , H04N19/85
摘要： This disclosure relates to a wide gamut encoder capable of receiving a wide gamut color image in accordance with a wide gamut standard. The encoder can encode one or more wide gamut color image pixel values into portions of narrow gamut encoding elements for transmission to a video encoder. The encoder can implement an advanced extended YCC format that is backward compatible with a P3 color gamut.
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公开(公告)号：US20160070974A1
公开(公告)日：2016-03-10
申请号：US14477679
申请日：2014-09-04
申请人： Apple Inc.
发明人： Yingjun Bai , Xuemei Zhang
CPC分类号： G06K9/4661 , G06F17/3028 , G06K9/46 , G06K9/4642 , G06K2009/4666 , G06T5/007 , G06T5/40 , G06T2207/20016
摘要： Methods, devices and computer readable instructions to generate multi-scale tone curves are disclosed. One method includes finding, for a given input image, a global tone curve that exhibits monotonic behavior. The input image may then be partitioned into a first number of sub-regions. For each sub-region, a local tone curve may be determined that has an output level that is constrained to the global tone curve at one or more first luminance levels so that each sub-region's local tone curve's output follows the global tone curve's monotonic behavior. If the resulting local tone curves provide sufficient control of shadow-boost, highlight-suppression, and contrast optimization the first number of local tone curves may be applied directly to the input image. If additional control is needed, each sub-region may again be partitioned and local tone curves determined for each of the new sub-regions.
摘要翻译： 公开了用于产生多尺度色调曲线的方法，装置和计算机可读指令。 一种方法包括为给定输入图像找到呈现单调行为的全局色调曲线。 然后可以将输入图像分割成第一数量的子区域。 对于每个子区域，可以确定本地色调曲线，其具有在一个或多个第一亮度水平下被限制到全局色调曲线的输出电平，使得每个子区域的局部色调曲线的输出遵循全局色调曲线的单调行为 。 如果所得到的本地色调曲线提供了阴影提升，高光抑制和对比度优化的足够控制，则可以将第一数量的局部色调曲线直接应用于输入图像。 如果需要附加控制，则每个子区域可以再次被划分，并且为每个新的子区域确定局部色调曲线。
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公开(公告)号：US20190082138A1
公开(公告)日：2019-03-14
申请号：US15701388
申请日：2017-09-11
申请人： Apple Inc.
发明人： Hao Pan , Munehiro Nakazato , Qiang Wang , Vaidyanath Mani , Xiaohua Yang , Xin Wang , Xuemei Zhang , Yingjun Bai
摘要： Techniques for adjusting formats of images and video are presented, for example where an SDR source is presented on an HDR display, or vice versa. Techniques include deriving a conversion profile for image data where the conversion profile is responsive to parameters describing characteristics of a domain of source image data and characteristics of a domain of a target rendering environment. Some techniques include creating a tone curve from weighted basis functions.
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公开(公告)号：US10043484B2
公开(公告)日：2018-08-07
申请号：US15275225
申请日：2016-09-23
申请人： Apple Inc.
IPC分类号： G09G5/06
摘要： Displaying wide-gamut images as intended on color-managed wide-gamut display systems while rendering a visually consistent image when rendered on targeted narrow-gamut display systems (regardless of whether the narrow-gamut displays are color-managed). Images represented in accordance with this disclosure are referred to as a dual-target images (DTI): one target being the image's original wide-gamut color space, the other target being a specified narrow-gamut color space. The novel representational scheme retains narrow-gamut rendering for those colors in a wide-gamut image that are within the targeted narrow-gamut color space, transitioning to wide-gamut rendering for those colors in the wide-gamut image that are outside the targeted narrow-gamut color space. This approach minimizes pixel clipping when rendering a wide-gamut image for a narrow-gamut display, while allowing the original wide-gamut pixel values to be recovered when rendering for a wide-gamut display.
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公开(公告)号：US09961238B2
公开(公告)日：2018-05-01
申请号：US14872114
申请日：2015-09-30
申请人： Apple Inc.
发明人： Yingjun Bai , Xuemei Zhang
CPC分类号： H04N1/6061 , G06T11/00 , G06T11/001
摘要： A gamut size metric is used in all phases of color image processing (e.g., capture, transmission, and display). In general, the gamut size metric is a single-valued metric that changes as image content changes. More particularly, a gamut boundary histogram is determined and used to estimate a gamut size metric. A gamut size metric identifies a minimum size gamut needed to encompass each pixel in an image, where the gamut size is limited at one end by a first device independent gamut (S1), and at another end by a second device independent color space (S2), where S1 is wholly enclosed within S2. The gamut size metric may be based on strict pixel color value differences. In other embodiments the gamut size metric may take into effect perceptual color differences and significance.
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公开(公告)号：US20170098428A1
公开(公告)日：2017-04-06
申请号：US15275225
申请日：2016-09-23
申请人： Apple Inc.
CPC分类号： G09G5/06 , G09G2320/0666 , G09G2340/06
摘要： In general, techniques are disclosed for displaying wide-gamut images as intended on color-managed wide-gamut display systems while rendering a visually consistent image when rendered on targeted narrow-gamut display systems (regardless of whether the narrow-gamut displays are color-managed). For this reason, an image represented in accordance with this disclosure is referred to as a dual-target image (DTI): one target being the image's original wide-gamut color space, the other target being a specified narrow-gamut color space. The novel representational scheme described herein retains narrow-gamut rendering for those colors in a wide-gamut image that are within the targeted narrow-gamut color space, transitioning to wide-gamut rendering for those colors in the wide-gamut image that are outside the targeted narrow-gamut color space. This approach minimizes pixel clipping when rendering a wide-gamut image for a narrow-gamut display, while allowing the original wide-gamut pixel values to be recovered when rendering for a wide-gamut display.
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公开(公告)号：US09344638B2
公开(公告)日：2016-05-17
申请号：US14292792
申请日：2014-05-30
申请人： Apple Inc.
发明人： 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分类号： H04N5/225 , H04N5/235 , G03B7/00 , H04N3/14 , H04N5/335 , H04N5/228 , H04N5/91 , G06K9/46 , G06T5/00 , H04N5/265 , H04N5/232 , G06T5/40
CPC分类号： 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
摘要： 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.
摘要翻译： 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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