System and method of backlight detecting for brightness value of sub area in focusing area
A technology of focusing area and brightness value, which is applied to parts of TV systems, parts of color TVs, TVs, etc., and can solve problems such as interpretation errors and backlight judgment errors.
Inactive Publication Date: 2008-07-23
ALTEK CORP
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[0005] In view of the problem that the focus area is cut out from the whole image, it is easy to cause the wrong judgment of the backlight, the purpose of the present invention is to provide a method for backlight detection using the brightness value of the sub-area in the focus area, by cutting the focus area into multiple sub-areas area, after calculating the luminance value of each sub-area, a set of codes is generated based on the luminance value of each sub-area to determine whether the subject being photographed is backlit, thereby solving the problem of interpretation errors mentioned in the previous technology, thereby achieving an improvement Purpose and Effect of Backlight Judgment Accuracy
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[0052] The system operation of the present invention is illustrated below with FIG. 1 , which is a system architecture diagram of the present invention using brightness values of sub-regions in the focus area for backlight detection. As shown in the figure, the system of the present invention includes a focus area setting module 110 , a focus area cutting module 120 , a brightness calculation module 130 , an encoding module 140 , a memory module 150 , and a backlight determination module 160 . The focus area setting module 110 is responsible for setting the focus area when the image capture device 100 of the present invention focuses on the subject to be photographed; the focus area cutting module 120 is responsible for setting the focus area set by the focus area setting module 110. The focus area generated according to the definition is divided into multiple sub-areas; the brightness calculation module 130 is responsible for calculating each brightness value corresponding t...
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A system which conducts the backlighting detection through utilizing the brightness value of a sub region in a focusing region and a process are applied on an image acquisition device, which cuts the focusing region into several sub regions and calculates the brightness value of each sub region, then combines to produce the codes which are used to express the whole focusing region after transforming into the codes of 0 and 1 according to the brightness value of each sub region, judges the state value which is relatively represented by each code through comparing a backlighting detection table which is established in advance in order to whether the main body which is shot is in the backlight..
Description
technical field [0001] The invention relates to a system and method for backlight detection, in particular to a system and method for backlight detection using the brightness value of a sub-region in a focus area. Background technique [0002] When the subject being photographed is between the light source and the camera, there will be a situation where the background brightness is much higher than that of the subject being photographed. This situation is called backlighting. Generally speaking, the background occupies a larger area in the image than the subject, so if the camera’s automatic exposure function is used when the backlight is on, the camera will expose according to the light conditions of the background, so that the subject being photographed is underexposed and the photography fails . In order to avoid shooting failures caused by using automatic exposure, you should try to avoid shooting objects in backlight under normal circumstances. However, there are ways...
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IPC IPC(8): H04N5/243H04N5/235H04N23/76
Inventor 吴宗达周宏隆
Owner ALTEK CORP