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公开(公告)号：US20210342989A1
公开(公告)日：2021-11-04
申请号：US17373362
申请日：2021-07-12
Applicant: Apple Inc.
Inventor： Touraj Tajbakhsh , Chihsin Wu , Frederic Cao
Abstract: Embodiments relate to hue preservation post processing for highlight recovery of an input image. Intensity values for multiple color channels of a plurality of color channels of a pixel of the input image is determined using corresponding ratios of target hues for the plurality of color channels of the pixel, wherein the pixel has at least one color channel with an intensity above a predetermined threshold. A hue preserved value for a color channel of the plurality of color channels of the pixel is determined using intensity values determined for the plurality of color channels of the pixel and the target hues. A recovered version of the input image is generated by adjusting hue information of the pixel, using the hue preserved value for the channel of the plurality of color channels of the pixel.
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公开(公告)号：US20200074601A1
公开(公告)日：2020-03-05
申请号：US16121389
申请日：2018-09-04
Applicant: Apple Inc.
Inventor： Touraj Tajbakhsh , Chihsin Wu , Frederic Cao
Abstract: Embodiments relate to hue preservation post processing for highlight recovery of an input image. Intensity values for multiple color channels of a plurality of color channels of a pixel of the input image is determined using corresponding ratios of target hues for the plurality of color channels of the pixel, wherein the pixel has at least one color channel with an intensity above a predetermined threshold. A hue preserved value for a color channel of the plurality of color channels of the pixel is determined using intensity values determined for the plurality of color channels of the pixel and the target hues. A recovered version of the input image is generated by adjusting hue information of the pixel, using the hue preserved value for the channel of the plurality of color channels of the pixel.
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公开(公告)号：US11521423B2
公开(公告)日：2022-12-06
申请号：US17150270
申请日：2021-01-15
Applicant: Apple Inc.
Inventor： Thorsten Gernoth , Ian R. Fasel , Touraj Tajbakhsh , Jia-Chi Wu
Abstract: Occlusion of facial features may be detected and assessed in an image captured by a camera on a device. Landmark heat maps may be used to estimate the location of landmarks such as the eyes, mouth, and nose of a user's face in the captured image. An occlusion heat map may also be generated for the captured image. The occlusion heat map may include values representing the amount of occlusion in regions of the face. The estimated locations of the eyes, mouth, and nose may be used in combination with the occlusion heat map to assess occlusion scores for the landmarks. The occlusion scores for the landmarks may be used control one or more operations of the device.
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公开(公告)号：US20210133428A1
公开(公告)日：2021-05-06
申请号：US17150270
申请日：2021-01-15
Applicant: Apple Inc.
Inventor： Thorsten Gernoth , Ian R. Fasel , Touraj Tajbakhsh , Jia-Chi Wu
Abstract: Occlusion of facial features may be detected and assessed in an image captured by a camera on a device. Landmark heat maps may be used to estimate the location of landmarks such as the eyes, mouth, and nose of a user's face in the captured image. An occlusion heat map may also be generated for the captured image. The occlusion heat map may include values representing the amount of occlusion in regions of the face. The estimated locations of the eyes, mouth, and nose may be used in combination with the occlusion heat map to assess occlusion scores for the landmarks. The occlusion scores for the landmarks may be used control one or more operations of the device.
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公开(公告)号：US20200077066A1
公开(公告)日：2020-03-05
申请号：US16116838
申请日：2018-08-29
Applicant: Apple Inc.
Inventor： Frederic Cao , Touraj Tajbakhsh , Muge Wang
Abstract: Embodiments relate to generation of hue maps for highlight recovery of an input image. An image having a plurality of color channels is obtained at a first resolution lower than a resolution of the input image. A hue for each color channel for each pixel is determined, using a pixel value for that color channel and pixel values for the plurality of color channels in the first image. Weights are determined for each pixel for each color channel, based on hues for the pixel and pixel values for the pixel in the first image. A plurality of candidate hue maps are generated, based on the weights and pixel values in the first image in a patch surrounding the pixel for the plurality of color channels.
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Patent Agency Ranking
公开(公告)号：US10070109B2
公开(公告)日：2018-09-04
申请号：US15198354
申请日：2016-06-30
Applicant: Apple Inc.
Inventor： Suk Hwan Lim , Frederic Cao , Touraj Tajbakhsh
Abstract: Embodiments of the present disclosure relate to highlight recovery of a high-resolution image using a single low-resolution image captured at a lower exposure. An example apparatus includes a hue target circuit that receives an input image at a high-resolution including at least one pixel with a clipped color channel. For example, the input image is a Blue sky image with a pixel having clipped Blue channel. The hue target circuit also receives a set of candidate hue maps having a pixel resolution lower than the high-resolution of the input image. The hue target circuit generates a target hue value for the at least one pixel using the pixel information of the set of candidate hue maps. The apparatus also includes a hue recovery circuit that generates a recovered version of the input image by adjusting hue information of the clipped color channel based on the generated target hue.
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公开(公告)号：US20180007332A1
公开(公告)日：2018-01-04
申请号：US15198354
申请日：2016-06-30
Applicant: Apple Inc.
Inventor： Suk Hwan Lim , Frederic Cao , Touraj Tajbakhsh
CPC classification number: H04N9/643 , G06T5/008 , G06T2207/10024 , H04N5/2355 , H04N9/045 , H04N9/68
Abstract: Embodiments of the present disclosure relate to highlight recovery of a high-resolution image using a single low-resolution image captured at a lower exposure. An example apparatus includes a hue target circuit that receives an input image at a high-resolution including at least one pixel with a clipped color channel. For example, the input image is a Blue sky image with a pixel having clipped Blue channel. The hue target circuit also receives a set of candidate hue maps having a pixel resolution lower than the high-resolution of the input image. The hue target circuit generates a target hue value for the at least one pixel using the pixel information of the set of candidate hue maps. The apparatus also includes a hue recovery circuit that generates a recovered version of the input image by adjusting hue information of the clipped color channel based on the generated target hue.
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公开(公告)号：US20150070537A1
公开(公告)日：2015-03-12
申请号：US14269941
申请日：2014-05-05
Applicant: Apple Inc.
Inventor： Yingjun Bai , Michael Chin , Touraj Tajbakhsh
CPC classification number: H04N9/735 , H04N1/60 , H04N1/6086 , H04N5/2353 , H04N5/3572
Abstract: This disclosure pertains to systems, methods, and computer readable media for performing lens shading correction (LSC) operations that modulate gains based on scene lux level and lens focus distance. These gains compensate for both color lens shading (i.e., the deviation between R, G, and B channels) and vignetting (i.e., the drop off in pixel intensity around the edges of an image). As scene illuminance increases, the sensor captures more signal from the actual scene, and the lens shading effects begin to appear. To deal with the situation, the lens shading gains are configured to adaptively ‘scale down’ when scene lux approaches zero and ‘scale up’ when scene lux changes from near zero to become larger. The lens shading gain may also be modulated based on the focus distance. For optical systems without zoom, the inventors have discovered that the amount of lens shading fall off changes as focus distance changes.
Abstract translation: 本公开涉及用于执行基于场景勒克斯水平和透镜焦距的调制增益的透镜阴影校正（LSC）操作的系统，方法和计算机可读介质。 这些增益补偿了彩色透镜阴影（即，R，G和B通道之间的偏差）和渐晕（即，围绕图像边缘的像素强度的下降）。 随着场景照度的增加，传感器捕获来自实际场景的更多信号，并开始出现镜头遮光效果。 为了处理这种情况，当场景勒克斯接近零时，镜头遮蔽增益被配置为自适应地“缩小”，当场景勒克斯从近零变化到更大时，“镜像”增大。 透镜遮光增益也可以基于焦距进行调制。 对于没有变焦的光学系统，本发明人已经发现，随着焦距的变化，透镜遮蔽量的下降变化。
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公开(公告)号：US10896318B2
公开(公告)日：2021-01-19
申请号：US15934559
申请日：2018-03-23
Applicant: Apple Inc.
Inventor： Thorsten Gernoth , Ian R. Fasel , Touraj Tajbakhsh , Jia-Chi Wu
Abstract: Occlusion of facial features may be detected and assessed in an image captured by a camera on a device. Landmark heat maps may be used to estimate the location of landmarks such as the eyes, mouth, and nose of a user's face in the captured image. An occlusion heat map may also be generated for the captured image. The occlusion heat map may include values representing the amount of occlusion in regions of the face. The estimated locations of the eyes, mouth, and nose may be used in combination with the occlusion heat map to assess occlusion scores for the landmarks. The occlusion scores for the landmarks may be used control one or more operations of the device.
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公开(公告)号：US10855964B2
公开(公告)日：2020-12-01
申请号：US16116838
申请日：2018-08-29
Applicant: Apple Inc.
Inventor： Frederic Cao , Touraj Tajbakhsh , Muge Wang
Abstract: Embodiments relate to generation of hue maps for highlight recovery of an input image. An image having a plurality of color channels is obtained at a first resolution lower than a resolution of the input image. A hue for each color channel for each pixel is determined, using a pixel value for that color channel and pixel values for the plurality of color channels in the first image. Weights are determined for each pixel for each color channel, based on hues for the pixel and pixel values for the pixel in the first image. A plurality of candidate hue maps are generated, based on the weights and pixel values in the first image in a patch surrounding the pixel for the plurality of color channels.
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