Method for detection of film mode or camera mode
AssigneeThomson Licensing
InventorsHassane Guermoud, Jonathan Kervec, Emmanuel Jolly
Life of this patent
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Abstract
The present invention relates to a method for detection of film mode or camera mode of a video sequence. This detection is carried out using histograms of video levels of frames of the video sequence. Difference histograms are calculated then compared with each other so as to generate difference parameters for each video frame of the sequence. The pattern formed by these difference parameters is then compared with predetermined patterns to deduce the mode, film or camera, of the sequence. The advantage of this method is that it requires just small memory resources for its implementation and can therefore be implanted in an FPGA circuit.
Claims11
Method for detection of film mode or camera mode of a sequence comprising at least three consecutive video frames, characterized in that it comprises the following steps:
- determine (E1) a histogram of the video levels of each of the video frames,
- calculate (E2), for each of the video frames of the sequence, a value representative of the histogram difference, called histogram difference value, between the histogram of said video frame and the histogram of the next video frame,
- compare (E3) the histogram difference value of each of the video frames of the sequence with at least one comparison value to generate, for each of said video frames, a parameter, of difference, whose value is representative of the character different or not to that of said video frame with respect to the next video frame, and
- compare (E4) the pattern formed by the values of difference parameters of video frames of the sequence with a plurality of predetermined patterns to generate mode information (MODE) identifying the mode, film or camera, of said sequence of video frames.
Device for detection of the film mode or camera mode of a sequence comprising at least three consecutive video frames, characterized in that it comprises:
- a first calculation circuit (110) to determine a histogram of video levels of each of the video frames,
- a second calculation circuit (120) to calculate, for each of the video frames of the sequence, a value representative of the histogram difference, called histogram difference, between the histogram of said video frame and the histogram of the next video frame,
- a first comparison circuit (130) to compare the histogram difference value of each of the video frames of the sequence with at least one comparison value and generate, for each of said video frames, a parameter, called difference, whose value is representative of the character different or not to that of said video frame with respect to the next video frame,
- a second comparison circuit (140) to compare the pattern formed by the values of difference parameters of video frames of the sequence with a plurality of predetermined patterns to generate mode information (MODE) identifying the mode, film or camera, of said sequence of video frames, and
- a control unit (160) to control said first and second calculation circuits and said first and second comparison circuits.
Dependencies are inferred from the claim text.