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公开(公告)号：US20160379347A1
公开(公告)日：2016-12-29
申请号：US15089700
申请日：2016-04-04
Applicant: REALTEK SEMICONDUCTOR CORP.
Inventor： Hao-Tien CHIANG , Shih-Tse CHEN
CPC classification number: G06T5/008 , G06T5/40 , G06T2207/20208 , H04N5/20 , H04N5/2355 , H04N9/68
Abstract: A method for wide dynamic range imaging is illustrated. A region mapping operation having steps as follows is applied to an image using a plurality of region mapping curves for compensating different luminance associated with a plurality of regions in the image. A low frequency image is obtained. A reference value for each region in the image is obtained according to the low frequency image. One region mapping curve is selected according to the reference value of the region. A gain curve is obtained according to the selected region mapping curve, a gain value of a pixel value or a luminance value of the region is obtained according to the gain curve, an adjusted gain value is obtained according to the luminance corresponding to the pixel value, and the pixel value is adjusted according to the luminance value, the gain value, and the adjusted gain value.
Abstract translation: 示出了用于宽动态范围成像的方法。 使用多个区域映射曲线将具有如下步骤的区域映射操作应用于图像，以补偿与图像中的多个区域相关联的不同亮度。 获得低频图像。 根据低频图像获得图像中每个区域的参考值。 根据区域的参考值选择一个区域映射曲线。 根据所选择的区域映射曲线获得增益曲线，根据增益曲线获得像素值的增益值或区域的亮度值，根据与像素值对应的亮度获得调整后的增益值 并且根据亮度值，增益值和调整后的增益值来调整像素值。
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2.发明申请公开(公告)号：US20170206641A1
公开(公告)日：2017-07-20
申请号：US15291691
申请日：2016-10-12
Applicant: Realtek Semiconductor Corp.
Inventor： Wei-Te CHANG , Shih-Tse CHEN
IPC: G06T5/00
CPC classification number: G06T5/005 , G01J3/462 , G01J3/50 , G06T5/007 , G06T2207/10024 , H04N1/6077 , H04N9/73 , H04N17/02
Abstract: A method for generating a pixel filtering boundary required by the auto white balance (AWB) calibration is proposed. The method includes: taking a specific color temperature reference point as a center and dividing a G/B-G/R color space into six color regions having different color component relationships; based on a saturation calculating approach of a HSV color space, respectively identifying six color boundaries in the six color regions to generate a specific hexagonal filtering boundary, so that each color boundary has a predetermined saturation difference with the specific color temperature reference point; adopting the approach for generating the specific hexagonal filtering boundary to respectively identify multiple hexagonal filtering boundaries corresponding to other color temperature reference points; generating an enveloping boundary as a pixel filtering boundary based on the specific hexagonal filtering boundary and the multiple hexagonal filtering boundaries.
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公开(公告)号：US20170208233A1
公开(公告)日：2017-07-20
申请号：US15296324
申请日：2016-10-18
Applicant: Realtek Semiconductor Corp.
Inventor： Wei-Te CHANG , Shih-Tse CHEN
CPC classification number: H04N5/2352 , G06K9/4661 , G06K9/6215 , G06T7/408 , G06T7/90
Abstract: A method for generating a target gain value of a wide dynamic range (WDR) operation is disclosed including: acquiring an average bright portion luminance corresponding to an average pixel luminance of a bright portion of a video image; acquiring an average dark portion luminance corresponding to an average pixel luminance of a dark portion of the video image; generating an initial gain value of the WDR operation according to a difference between the average bright portion luminance and the average dark portion luminance; and adjusting the initial gain value according to at least one of a color temperature and an exposure duration configuration value of the video image to generate the target gain value.
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