An exposure time adjusting method, device and a camera
A technology of exposure time and adjustment method, applied in the field of cameras, can solve the problems of flicker and image quality degradation, and achieve the effect of avoiding flicker and achieving the best image quality.
Active Publication Date: 2010-06-02
北京中星天视科技有限公司
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Problems solved by technology
When the automatic exposure camera system is in a 50Hz (or 60Hz) indoor lighting environment, if the indoor lighting is bright, even if the exposure time has been reduced to 1 / 100 second (or 1 / 120 second), the image collected by the camera system will still have Relatively high brightness, at this time, the automatic exposure function of the camera system may adjust the exposure time to less than 1 / 100 second (or 1 / 120 second), resulting in light and dark stripes on the image, that is, flicker phenomenon, which reduces the image quality
[0005] In fact, in many cases, the brightness of the image can be allowed to be higher without reducing the exposure time, so as to avoid the flicker phenomenon and obtain better image quality, but the corresponding solution has not been given in the prior art
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[0019] The embodiment of the present invention provides an exposure time adjustment method, device and a camera, which utilizes the different characteristics of image brightness distribution in indoor and outdoor environments, and adds special processing for indoor and outdoor mode switching on the basis of the existing automatic exposure system , automatically judge whether the current environment is indoors, and avoid flicker phenomenon on the image while the image brightness is appropriate, so as to obtain better image quality.
[0020] In the embodiment of the present invention, the state of the exposure time of the automatic exposure system is divided into an indoor mode and an outdoor mode, and the indoor mode refers to an exposure time greater than or equal to 1 / 100 second (or 1 / 120 second); The outdoor mode mentioned above refers to an exposure state where the exposure time is less than 1 / 100 second (or 1 / 120 second); 1 / 120 second).
[0021] The indoor environment des...
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The invention discloses a method and a device for adjusting an exposure time, and a camera, which is used for realizing automatic switch of the exposure time between indoor mode and outdoor mode, andavoiding fliker phenomena when image brightness is appropriate. The method for adjusting the exposure time comprises: calculating the average brightness of an image acquired by a camera system, as well as the average brightness of each region in the image; reducing the exposure time according to the average brightness of each region, when the exposure time of the camera system is in the borderlineof the indoor mode and the outdoor mode, and the average brightness of the acquired image is higher than a preset first threshold, so that the adjusted exposure time is in outdoor mode. The inventionis used for adjusting the exposure time of the camera system.
Description
technical field [0001] The invention relates to the technical field of imaging, in particular to an exposure time adjustment method and device and a camera. Background technique [0002] With the wide application of cameras in fields such as social life and home entertainment, the technologies involved in cameras are also undergoing rapid development. The camera generally adopts a row exposure method, that is, images of different rows are acquired at different time exposures. Most of the lamps used in daily use are powered by alternating current whose amplitude changes periodically, and the brightness power produced also fluctuates periodically. Therefore, when the row exposure time is not an integer multiple of the light power cycle, the brightness of different rows will change due to the different light energy received by different rows, thus forming light and dark stripes in the image. This phenomenon is called flicker. )Phenomenon. [0003] In practice, in order to el...
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IPC IPC(8): H04N5/235
Inventor 李昕彤
Owner 北京中星天视科技有限公司