公开(公告)号：WO2017205492A1

公开(公告)日：2017-11-30

申请号：PCT/US2017/034231

申请日：2017-05-24

Applicant: GOPRO, INC.

Inventor： DOUADY-PLEVEN, Bruno Cesar ,  KRAAK, Michael Serge Andre ,  GUERIN, Guillaume Matthieu ,  VEIT, Thomas Nicolas Emmanuel

IPC: H04N5/357

Abstract: Systems and methods are disclosed for image signal processing. For example, methods may include receiving a current image of a sequence of images from an image sensor; combining the current image with a recirculated image to obtain a noise reduced image, where the recirculated image is based on one or more previous images of the sequence of images from the image sensor; determining a noise map for the noise reduced image, where the noise map is determined based on estimates of noise levels for pixels in the current image, a noise map for the recirculated image, and a set of mixing weights; recirculating the noise map with the noise reduced image to combine the noise reduced image with a next image of the sequence of images from the image sensor; and storing, displaying, or transmitting an output image that is based on the noise reduced image.

Abstract translation: 公开了用于图像信号处理的系统和方法。 例如，方法可以包括：从图像传感器接收图像序列的当前图像; 将当前图像与再循环图像组合以获得降噪图像，其中再循环图像基于来自图像传感器的图像序列的一个或多个先前图像; 确定噪声减小图像的噪声图，其中噪声图基于当前图像中的像素的噪声水平的估计，再循环图像的噪声图和一组混合权重来确定; 用降噪图像再循环噪声图以将降噪图像与来自图像传感器的图像序列的下一图像组合; 并存储，显示或发送基于降噪图像的输出图像。

公开(公告)号：WO2019104047A1

公开(公告)日：2019-05-31

申请号：PCT/US2018/062032

申请日：2018-11-20

Applicant: GOPRO, INC.

Inventor： DOUADY-PLEVEN, Bruno César ,  KRAAK, Michael Serge Andre ,  GUÉRIN, Guillaume Matthieu ,  VEIT, Thomas Nicolas Emmanuel

IPC: H04N5/235 ,  G06T5/00 ,  H04N5/243 ,  H04N5/357 ,  H04N9/64

CPC classification number: H04N5/2351 ,  G06T5/009 ,  G06T5/40 ,  G06T2207/10024 ,  G06T2207/20008 ,  H04N5/235 ,  H04N5/243 ,  H04N5/357 ,  H04N9/646

Abstract: A system accesses an image with each pixel of the image having luminance values each representative of a color component of the pixel. The system generates a first histogram for aggregate luminance values of the image, and accesses a target histogram for the image representative of a desired global image contrast. The system computes a transfer function based on the first histogram and the target histogram such that when the transfer function is applied, a histogram of the modified aggregate luminance values is within a threshold similarity of the target histogram. The system modifies the image by applying the transfer function to the luminance values of the image to produce a tone mapped image, and outputs the modified image.