Arrangement for generating a 3:2 pull-down switch-off signal for a video compression encoder

A technology that turns off signal and video compression. It is used in digital video signal modification, television, image communication, etc., and can solve problems such as errors.

Inactive Publication Date: 2009-09-16
ENTROPIC COMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Problems with such known arrangements include the fact that applying an inverse 3:2 pulldown to an NTSC signal will lead to a large number of errors in representation, especially if the inverse 3:2 converted NTSC signal is not or no longer This is especially true when motion is shown in the case of a film scan of 24 frames, but when the signal is a normal video signal containing 60 different fields, each second containing a different phase of motion

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  • Arrangement for generating a 3:2 pull-down switch-off signal for a video compression encoder
  • Arrangement for generating a 3:2 pull-down switch-off signal for a video compression encoder
  • Arrangement for generating a 3:2 pull-down switch-off signal for a video compression encoder

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[0026] As explained above, an NTSC video signal available at 60 fields per second can be restored to a "normal" video signal by scanning at 60 fields per second. Such signals are generated, for example, by electronic cameras. However the NTSC signal can also be recovered by scanning the film which can be obtained at 24 frames per second. In order to produce an NTSC signal of 60 fields rather than just 48 from 24 frames per second (which is the number of fields an NTSC signal would have per second), a so-called 3:2 pulldown technique can be applied to the signal, where each Appeared several times.

[0027] For video compression, it is useless to compress the same field several times. Therefore, it is appropriate to identify which fields are generated several times and to exclude these fields. For this purpose, the so-called inverse 3:2 pull-down conversion is known, which performs exactly the above operation and again produces 24 frames from the scanned film for video compress...

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Abstract

Arrangement for generating a pull-down switch-off signal The invention relates to an arrangement (1) for generating a pulldown switch-off signal for a video compression encoder, which signal is determined by the arrangement (1) in dependence on a converted signal which is produced from an NTSC signal by means of an inverse 3:2 pull down conversion, wherein the circuit arrangement includes a M(ean) A(bsolute) D(istortion) (MAD) detector (2) and a circuit (3) for determining Hadamard coefficients, wherein the MAD detector (2) produces a MAD signal which indicates for each block of predefined size the difference between the picture contents of two consecutive frames, wherein the circuit (3) for determining the Hadamard coefficients delivers two coefficients in blocks per frame, from which coefficients a first coefficient indicates the sum of the differences of the pixels of adjacent scanning lines i and i+1 and a second coefficient indicates the sum of the differences of the pixels of scanning lines i and i+2, and wherein the pull-down switch-off signal is generated in dependence on the summed values of the MAD signal for all blocks of a frame and in dependence on the two Hadamard coefficients summed for all the blocks of a frame.

Description

technical field [0001] The invention relates to a device for generating a pull-down off signal determined for a video compression encoder, which may be, for example, an MPEG2 encoder. The apparatus then generates the pull-down off signal based on a converted signal generated from an NTSC signal by an inverse 3:2 pull-down conversion. Background technique [0002] A process called 3:2 pull-down conversion is applied to this NTSC signal formed by scanning the film at 24 frames per second. Then, the scanning signal is converted into an NTSC video signal of 60 fields per second. If each scanned frame is then used to generate two fields, there will be only 48 fields per second. Therefore, each frame is alternately scanned three times to produce 3 identical fields. Such a result means that each frame in the movie is scanned in a 3:2:3:2 cycle, so that 24 frames per second becomes a video signal of 60 fields per second. [0003] For example for DVD recorders, and also for recor...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04N7/01H04N7/26
CPCH04N19/00H04N7/0115
InventorO·佐伊佩尔
OwnerENTROPIC COMM INC