Method for detecting horizontal black tape in video image
A technology of video images and black belts, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as unreliable methods
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[0027] figure 1 is a video image including upper and lower black bands in 4 / 3 format and displayed on a 16 / 9 screen. The right and left sides of the screen are filled with vertical black bars. In the example used by this method, automatic zooming is initiated by the detection of a horizontal bar so that a full screen image is displayed.
[0028] In fact, the detection of black bands amounts to determining in the image the first and last lines carrying the information of the video image, which will subsequently be referred to as the "live" video image. exist figure 1 In , the first line of the "active" video image is reference 1 and the last line is reference 2.
[0029] The principle of the algorithm used by the invention relies on comparing, on a video line, at low level, the value corresponding to the maximum number of pixels with the same brightness value with a threshold value dependent on the quality of the image being processed.
[0030] Thus, the criteria for determ...
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