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公开(公告)号：US09767544B2
公开(公告)日：2017-09-19
申请号：US14733272
申请日：2015-06-08
Applicant: Texas Instruments Incorporated
Inventor： Aziz Umit Batur , Rajesh Narasimha
CPC classification number: G06T5/40 , G06T5/002 , G06T5/009 , G06T2207/10004 , G06T2207/20021 , G06T2207/20081 , H04N5/217 , H04N5/23229 , H04N5/2351
Abstract: A method for brightness and contrast enhancement includes computing a luminance histogram of a digital image, computing first distances from the luminance histogram to a plurality of predetermined luminance histograms, estimating first control point values for a global tone mapping curve from predetermined control point values corresponding to a subset of the predetermined luminance histograms selected based on the computed first distances, and interpolating the estimated control point values to determine the global tone mapping curve. The method may also include dividing the digital image into a plurality of image blocks, and enhancing each pixel in the digital image by computing second distances from a pixel in an image block to the centers of neighboring image blocks, and computing an enhanced pixel value based on the computed second distances, predetermined control point values corresponding to the neighboring image blocks, and the global tone mapping curve.
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公开(公告)号：US20190180719A1
公开(公告)日：2019-06-13
申请号：US16273896
申请日：2019-02-12
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajesh Narasimha , Aziz Umit Batur
CPC classification number: G09G5/377 , G06T5/008 , G06T5/50 , G06T2207/10144 , G06T2207/20012 , G06T2207/20021 , G06T2207/20208 , H04N5/2355 , H04N5/35581
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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公开(公告)号：US10255888B2
公开(公告)日：2019-04-09
申请号：US14098230
申请日：2013-12-05
Applicant: Texas Instruments Incorporated
Inventor： Rajesh Narasimha , Aziz Umit Batur
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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公开(公告)号：US10825426B2
公开(公告)日：2020-11-03
申请号：US16273896
申请日：2019-02-12
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajesh Narasimha , Aziz Umit Batur
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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公开(公告)号：US09437171B2
公开(公告)日：2016-09-06
申请号：US14098243
申请日：2013-12-05
Applicant: Texas Instruments Incorporated
Inventor： Rajesh Narasimha , Aziz Umit Batur
IPC: G09G5/37 , G06T5/00 , G06T5/50 , G06T3/40 , G09G5/02 , H04N1/60 , H04N5/57 , H04N9/68 , G09G5/377
CPC classification number: G09G5/377 , G06T5/008 , G06T5/50 , G06T2207/10144 , G06T2207/20012 , G06T2207/20021 , G06T2207/20208
Abstract: A method of local tone mapping of a high dynamic range (HDR) image is provided that includes dividing a luminance image of the HDR image into overlapping blocks and computing a local tone curve for each block, computing a tone mapped value for each pixel of the luminance image as a weighted sum of values computed by applying local tone curves of neighboring blocks to the pixel value, computing a gain for each pixel as a ratio of the tone mapped value to the value of the pixel, and applying the gains to corresponding pixels in the HDR image. A weight for each value is computed based on distance from the pixel to the center point of the block having the local tone curve applied to compute the value and the intensity difference between the value of the pixel and the block mean pixel value.
Abstract translation: 提供了一种高动态范围（HDR）图像的本地色调映射的方法，其包括将HDR图像的亮度图像划分为重叠块并计算每个块的局部色调曲线，计算每个块的每个像素的色调映射值 亮度图像作为通过将相邻块的局部色调曲线应用于像素值而计算的值的加权和，将每个像素的增益计算为色调映射值与像素的值的比率，以及将增益应用于对应像素 在HDR图像中。 基于应用了本地色调曲线的块的像素到中心点的距离来计算每个值的权重，以计算像素的值和块平均像素值之间的值和强度差。
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Patent Agency Ranking
公开(公告)号：US12283259B2
公开(公告)日：2025-04-22
申请号：US17035250
申请日：2020-09-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajesh Narasimha , Aziz Umit Batur
IPC: G09G5/377 , G06T5/50 , G06T5/92 , G06T5/94 , G06V10/60 , H04N23/741 , H04N23/743 , H04N25/589
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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公开(公告)号：US20230217116A1
公开(公告)日：2023-07-06
申请号：US18122389
申请日：2023-03-16
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajesh Narasimha , Aziz Umit Batur
IPC: H04N23/743 , H04N23/741 , G06T5/00 , G06V10/60
CPC classification number: H04N23/743 , G06T5/009 , G06V10/60 , H04N23/741 , G06T2207/10144 , G06T2207/20208
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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公开(公告)号：US20140198977A1
公开(公告)日：2014-07-17
申请号：US13848697
申请日：2013-03-21
Applicant: Texas Instruments Incorporated
Inventor： Rajesh Narasimha , Karthik Jayaraman Raghuram , Jesse Gregory Villarreal, JR. , Roman Joel Pacheco
CPC classification number: G06K9/6212 , G06T5/007 , G06T7/593 , G06T2207/20016 , G06T2207/20021
Abstract: A method for computation of a depth map for corresponding left and right two dimensional (2D) images of a stereo image is provided that includes determining a disparity range based on a disparity of at least one object in a scene of the left and right 2D images, performing color matching of the left and right 2D images, performing contrast and brightness matching of the left and right 2D images, and computing a disparity image for the left and right 2D images after the color matching and the contrast and brightness matching are performed, wherein the disparity range is used for correspondence matching of the left and right 2D images.
Abstract translation: 提供了一种用于计算立体图像的相应左和右二维（2D）图像的深度图的方法，其包括基于左右2D图像的场景中的至少一个对象的视差来确定视差范围 执行左右2D图像的颜色匹配，执行左右2D图像的对比度和亮度匹配，以及在进行颜色匹配和对比度和亮度匹配之后计算左右2D图像的视差图像， 其中，所述视差范围用于左右2D图像的对应匹配。
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公开(公告)号：US20140152686A1
公开(公告)日：2014-06-05
申请号：US14098243
申请日：2013-12-05
Applicant: Texas Instruments Incorporated
Inventor： Rajesh Narasimha , Aziz Umit Batur
IPC: G06T5/00
CPC classification number: G09G5/377 , G06T5/008 , G06T5/50 , G06T2207/10144 , G06T2207/20012 , G06T2207/20021 , G06T2207/20208
Abstract: A method of local tone mapping of a high dynamic range (HDR) image is provided that includes dividing a luminance image of the HDR image into overlapping blocks and computing a local tone curve for each block, computing a tone mapped value for each pixel of the luminance image as a weighted sum of values computed by applying local tone curves of neighboring blocks to the pixel value, computing a gain for each pixel as a ratio of the tone mapped value to the value of the pixel, and applying the gains to corresponding pixels in the HDR image. A weight for each value is computed based on distance from the pixel to the center point of the block having the local tone curve applied to compute the value and the intensity difference between the value of the pixel and the block mean pixel value.
Abstract translation: 提供了一种高动态范围（HDR）图像的本地色调映射的方法，其包括将HDR图像的亮度图像划分为重叠块并计算每个块的局部色调曲线，计算每个块的每个像素的色调映射值 亮度图像作为通过将相邻块的局部色调曲线应用于像素值而计算的值的加权和，将每个像素的增益计算为色调映射值与像素的值的比率，以及将增益应用于对应像素 在HDR图像中。 基于应用了本地色调曲线的块的像素到中心点的距离来计算每个值的权重，以计算像素的值和块平均像素值之间的值和强度差。
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公开(公告)号：US20210012755A1
公开(公告)日：2021-01-14
申请号：US17035250
申请日：2020-09-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Rajesh Narasimha , Aziz Umit Batur
Abstract: A method of generating a high dynamic range (HDR) image is provided that includes capturing a long exposure image and a short exposure image of a scene, computing a merging weight for each pixel location of the long exposure image based on a pixel value of the pixel location and a saturation threshold, and computing a pixel value for each pixel location of the HDR image as a weighted sum of corresponding pixel values in the long exposure image and the short exposure image, wherein a weight applied to a pixel value of the pixel location of the short exposure image and a weight applied to a pixel value of the pixel location in the pixel long exposure image are determined based on the merging weight computed for the pixel location and responsive to motion in a scene of the long exposure image and the short exposure image.
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