公开(公告)号：US09432588B2

公开(公告)日：2016-08-30

申请号：US14628885

申请日：2015-02-23

Applicant: Axis AB

Inventor： Fredrik Svensson ,  Johan Tuvesson ,  Linda Haals

IPC: H04N5/235 ,  H04N9/77 ,  H04N5/243

CPC classification number: H04N5/2353 ,  H04N5/2351 ,  H04N5/2352 ,  H04N5/243 ,  H04N9/77

Abstract: A method for controlling exposure of a camera is disclosed. The method comprises calculating a darkness level and a saturation level with respect to a first image in a video sequence. If the saturation level exceeds a first limit, a target value for a mean intensity value of pixels in images captured by the camera is decreased by an amount which is an increasing function of the darkness level. The decreased target value is used to control the exposure of the camera for images subsequent to the first image in the video sequence, such that the mean intensity value of pixels in the subsequent images approaches the decreased target value.

Abstract translation: 公开了一种用于控制照相机曝光的方法。 该方法包括相对于视频序列中的第一图像来计算黑度级和饱和度级。 如果饱和度超过第一限制，则由摄像机拍摄的图像中的像素的平均强度值的目标值减少黑暗度的增加函数的量。 降低的目标值用于控制摄像机对视频序列中的第一图像之后的图像的曝光，使得后续图像中的像素的平均强度值接近降低的目标值。

公开(公告)号：US09965835B2

公开(公告)日：2018-05-08

申请号：US14555803

申请日：2014-11-28

Applicant: Axis AB

Inventor： Fredrik Svensson ,  Per Kannermark ,  Andreas Nilsson

IPC: G06K9/00 ,  G06T5/00 ,  G06T5/40

CPC classification number: G06T5/009 ,  G06T5/40

Abstract: A method and system are disclosed. The method may include determining a histogram of intensity values for pixels in image sensor data in which the histogram is bimodal. The method may include determining a breakpoint between the two modes. The histogram may include a first distribution of intensity values below the breakpoint and a second distribution of intensity values above the breakpoint. The method may include generating output intensity values. Generating output intensity values may include compressing the first distribution of intensity values of the pixels with intensity values below the breakpoint, stretching the second distribution of intensity values of the pixels with intensity values above the breakpoint, and generating an output image based on the output intensity values.

公开(公告)号：US20150244918A1

公开(公告)日：2015-08-27

申请号：US14628885

申请日：2015-02-23

Applicant: Axis AB

Inventor： Fredrik Svensson ,  Johan Tuvesson ,  Linda Haals

IPC: H04N5/235 ,  H04N9/77

CPC classification number: H04N5/2353 ,  H04N5/2351 ,  H04N5/2352 ,  H04N5/243 ,  H04N9/77

Abstract: A method for controlling exposure of a camera is disclosed. The method comprises calculating a darkness level and a saturation level with respect to a first image in a video sequence. If the saturation level exceeds a first limit, a target value for a mean intensity value of pixels in images captured by the camera is decreased by an amount which is an increasing function of the darkness level. The decreased target value is used to control the exposure of the camera for images subsequent to the first image in the video sequence, such that the mean intensity value of pixels in the subsequent images approaches the decreased target value.

Abstract translation: 公开了一种用于控制照相机曝光的方法。 该方法包括相对于视频序列中的第一图像来计算黑度级和饱和度级。 如果饱和度超过第一限制，则由摄像机拍摄的图像中的像素的平均强度值的目标值减少黑暗度的增加函数的量。 降低的目标值用于控制摄像机对视频序列中的第一图像之后的图像的曝光，使得后续图像中的像素的平均强度值接近降低的目标值。

公开(公告)号：US20160155218A1

公开(公告)日：2016-06-02

申请号：US14555803

申请日：2014-11-28

Applicant: Axis AB

Inventor： Fredrik Svensson ,  Per Kannermark ,  Andreas Nilsson

IPC: G06T5/00 ,  G06T5/20 ,  H04N7/18 ,  G06T5/40

CPC classification number: G06T5/009 ,  G06T5/40

Abstract: A method and system are disclosed. The method may include determining a histogram of intensity values for pixels in image sensor data in which the histogram is bimodal. The method may include determining a breakpoint between the two modes. The histogram may include a first distribution of intensity values below the breakpoint and a second distribution of intensity values above the breakpoint. The method may include generating output intensity values. Generating output intensity values may include compressing the first distribution of intensity values of the pixels with intensity values below the breakpoint, stretching the second distribution of intensity values of the pixels with intensity values above the breakpoint, and generating an output image based on the output intensity values.

Abstract translation: 公开了一种方法和系统。 该方法可以包括确定直方图是双峰的图像传感器数据中的像素的强度值的直方图。 该方法可以包括确定两种模式之间的断点。 直方图可以包括低于断点的强度值的第一分布和高于断点的强度值的第二分布。 该方法可以包括产生输出强度值。 生成输出强度值可以包括以强度值低于断点压缩像素的强度值的第一分布，用强度值高于断点的像素的强度值的第二分布进行拉伸，以及基于输出强度生成输出图像 价值观。