Automatic exposure method and apparatus

An automatic exposure and exposure control technology, applied in image data processing, television, instruments, etc., can solve problems such as increasing difficulty, affecting video analysis, reducing the contrast and signal-to-noise ratio of moving objects, and ensuring motion tracking and preventing excessive darkness. Or overexposure, the effect of improving contrast and signal-to-noise ratio
CN101304489AInactive Publication Date: 2008-11-12VIMICRO CORP
0 Cites 73 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
VIMICRO CORP
Publication Date
2008-11-12
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an automatic exposure method and a device thereof. When detecting that a moving object occurs in an image, the camera of the invention can adjust the exposure control fundamental parameters according to brightness information of the region where the moving object locates and expose the whole image according to the adjusted exposure control fundamental parameters, thus ensuring suitable brightness of the moving object region in the image, increasing the contrast and signal-to-noise ratio of the moving object region, avoiding over-darkness or over-exposure of the moving object region; simultaneously, ensuring acceptable brightness of the whole image region. Particularly, in conditions of over-weak or over-bright light, the moving object region in the image obtained by the automatic exposure method of the invention has suitable brightness, thus increasing the contrast and signal-to-noise ratio of the moving region and ensuring latter processes, such as movement tracking and moving object identification.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to image acquisition technology, in particular to an automatic exposure method and device. Background technique

[0002] For different application scenarios, the camera is required to have different functions. For cameras used for motion detection, scene monitoring, etc., it is necessary to perform exposure processing on moving objects called foreground (such as moving people, moving objects, moving vehicles, etc.) and background areas that remain unchanged.

[0003] At present, in application scenarios such as motion detection and scene monitoring, the camera uses the exposure setting for the whole image to perform automatic exposure processing. Due to the difference in ambient light, the existing exposure settings for the entire image can make the entire image have a suitable average brightness. However, if the moving target is located in the dark or bright area of ​​the image, especially if there are windows or strong light so...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More