公开(公告)号：US09554059B1

公开(公告)日：2017-01-24

申请号：US14873711

申请日：2015-10-02

Applicant: Quanta Computer Inc.

Inventor： Chin-An Lin ,  Chung-Te Li ,  Keng-Sheng Lin ,  Hao-Jen Wang ,  Hsin-Yu Chen

IPC: H04N5/235 ,  H04N5/335 ,  H04N5/355

CPC classification number: H04N5/2355 ,  H04N5/2351 ,  H04N5/2356 ,  H04N5/35554 ,  H04N5/35581

Abstract: An exposure-control system and an associated exposure control method are provided. The exposure-control system includes: an image capturing unit configured to capture a long-exposure image and a short-exposure image with a first exposure value and a second exposure value, respectively; and a processor, configured to calculate histograms of the long-exposure image and the short-exposure image, and calculate an exposure ratio according to the calculated histograms, the first and second exposure values, wherein when the exposure ratio is smaller than a first threshold, the processor switches a current exposure mode to a low dynamic range mode. When the exposure ratio is larger than a second threshold, the processor switches the current exposure mode to a high dynamic range mode. When the exposure ratio is between the first threshold and the second threshold, the processor does not switch the current exposure mode.

Abstract translation: 提供曝光控制系统和相关的曝光控制方法。 曝光控制系统包括：图像拍摄单元，被配置为分别捕获具有第一曝光值和第二曝光值的长曝光图像和短曝光图像; 以及处理器，被配置为计算长曝光图像和短曝光图像的直方图，并且根据所计算的直方图，第一和第二曝光值计算曝光比，其中当曝光比小于第一阈值时 处理器将当前曝光模式切换到低动态范围模式。 当曝光比大于第二阈值时，处理器将当前曝光模式切换到高动态范围模式。 当曝光比在第一阈值和第二阈值之间时，处理器不切换当前曝光模式。