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

Inactive Publication Date: 2004-12-01
THOMSON MULTIMEDIA SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, these methods are not very reliable because they rely on brightness settings, signal-to-noise ratios, identifiers inserted into black bands, etc.

Method used

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  • Method for detecting horizontal black tape in video image
  • Method for detecting horizontal black tape in video image
  • Method for detecting horizontal black tape in video image

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Embodiment Construction

[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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Abstract

A process for detecting black bands in a video image within a luminance range corresponding to low luminance values comprises the steps of: calculating, for each line situated in a location in which a black band can be expected to be found if present in said video image, a value relating to a maximum number of occurrences of points having the same luminance value; averaging said value over said lines in said location; calculating a threshold dependent on said average; and, comparing said value relating to said maximum number of occurrences obtained for a new line with said threshold. Applications relate, for example, to the detection of the ''letterbox'' format.

Description

technical field [0001] The present invention relates to a method for automatically detecting horizontal black bands, for example, on a 16 / 9 screen, for automatically scaling video images in 4 / 3 format. Background technique [0002] There are currently methods of automatically detecting the so-called "letterbox" format that includes black horizontal bars at the top and bottom of the television picture. These methods are usually based on measuring the video signal level at the beginning or last few lines of the video image. It is a function of the average luminance level on the first few lines and the last few lines so that "letterbox" format is detected. [0003] However, these methods are not very reliable as they rely on brightness settings, signal-to-noise ratios, identifiers inserted within black bands, etc. Contents of the invention [0004] The object of the present invention is to overcome the above-mentioned disadvantages. [0005] The subject of the invention is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/46H04N5/44
CPCH04N7/0122
Inventor 安妮-弗朗索瓦·若昂布朗
Owner THOMSON MULTIMEDIA SA
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