Method and device for determining target regions in image
A target area, in-image technology, applied in the field of image processing, can solve the problems of low light brightness, high brightness of the projection screen, and difficulty in accurately capturing the projected image.
Active Publication Date: 2016-06-01
QINGDAO HISENSE MOBILE COMM TECH CO LTD
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Problems solved by technology
[0004] Embodiments of the present invention provide a method and device for determining a target area in an image, which is used to solve the problem in the prior art that the brightness of the light in the surrounding environment is low and the brightness of the projection screen is high, so that when using electronic equipment to shoot , it is difficult to accurately capture the problem of the projected image
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Embodiment 1
[0086] Embodiment one, as image 3 As shown, this embodiment includes the following processes:
[0087] S301. Acquire a preview image with a size of [W, H];
[0088] S302. Divide the preview image into (W / m)*(H / m) units in units of m*m;
[0089] S303. Calculate the average brightness value of each unit, and determine the corresponding brightness level;
[0090] S304, counting the ratio R of units satisfying the set brightness threshold to the preview image t ;
[0091] S305. Judging R t Whether it is greater than or equal to the set second threshold R;
[0092] If yes, execute S306;
[0093] If not, return to S301;
[0094] S306. Perform continuous processing;
[0095] S307. Using the seed growth algorithm to obtain the maximum continuous brightness area A max , and calculate A max Ratio of preview image R max ;
[0096] S308. Judging R max Whether it is greater than or equal to the set sixth threshold R a ;
[0097] If yes, execute S309;
[0098] If not, execu...
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The invention discloses a method and a device for determining target regions in an image. A problem of a difficulty in precisely capturing a projection image when an electronic device is used for shooting in the prior art is solved. The method comprises steps of dividing an acquired image into multiple units and calculating an average brightness value of each unit; according to a corresponding relation between a preset average brightness value and a brightness grade, determining a brightness grade corresponding to the average brightness value of each unit; when the brightness grade is larger than or equal to a set first condition which number of units with preset threshold values satisfies in the image, determining at least one continuous brightness region form the image; selecting a continuous brightness region including most pixel points from the at least one continuous brightness region; and when the number of the pixel points included in the selected continuous brightness region satisfies a set second condition, using the selected continuous brightness region as a target region. Thus, the electronic device can be used for quickly and precisely capturing highlight images.
Description
technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for determining a target area in an image. Background technique [0002] In daily life and work, people often participate in meetings, training, speeches and other activities. At the scene, participants often use a projector to project the content to be told on the projection screen in the form of PPT to present to the audience. In order to record useful projection images in time, the audience often use mobile phones, tablet computers, digital cameras and other electronic devices to capture and save the projection images on the projection screen to their own electronic devices for subsequent reference. [0003] Because when using a projector to play images, in order to ensure that the projected images played can be clearly seen by the audience at the scene, the brightness of the light in the surrounding environment needs to be lower than the ...
Claims
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IPC IPC(8): G06T7/00
CPCG06T7/00G06T2207/10004
Inventor 李兵
Owner QINGDAO HISENSE MOBILE COMM TECH CO LTD