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A method of identifying inconsistent field dominance metadata in a sequence of video frames

A video frame and metadata technology, applied in the field of identifying inconsistent field advantage metadata in video frame sequences, can solve problems such as flag damage and wrongly set flags

Inactive Publication Date: 2010-04-07
PROJECT GIANTS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for example as a result of editing or transcoding actions, this flag may be corrupted (or omitted), such that the flag is incorrectly set during video processing

Method used

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  • A method of identifying inconsistent field dominance metadata in a sequence of video frames
  • A method of identifying inconsistent field dominance metadata in a sequence of video frames
  • A method of identifying inconsistent field dominance metadata in a sequence of video frames

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Embodiment Construction

[0020] see figure 1 , schematically shows a video frame 10 comprising horizontal lines 12, 14 making up the image. Typically, a frame conforming to the PAL standard includes 625 such pixel rows, while a frame conforming to the US NTSC standard includes 525 rows. As mentioned before, each video frame 10 comprises two separate fields. A field will contain the top row of pixels and every other subsequent row, i.e. it will contain the figure 1 All line breaks shown in the representation. This field is called the front field. Another field will contain the second row of pixels and every other subsequent row such that it includes the bottom row of pixels in the video frame, i.e. figure 1 The solid line row of pixels shown in . This field is called the back field.

[0021] Although individual video sequences will be recorded with a constant individual field advantage, it is very likely that several such individual video sequences will be edited together to form the final broadc...

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PUM

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Abstract

Embodiments of the present invention provide a method of identifying inconsistent field order flags for a sequence of video frames comprising: for each frame in the sequence of video frames analysing the frame to make an initial determination of the field order for that frame; averaging the initial determination of the field order over a predefined number of most recently analysed frames; and determining those frames for which the averaged field order does not match the field order identified by a respective field order metadata item associated with each frame by comparing the averaged field order for each frame to the respective field order metadata item.

Description

technical field [0001] The present invention relates to a method of identifying inconsistent field dominance metadata in a sequence of video frames. Background technique [0002] Video frames can be classified as either progressive or interlaced, depending on the method used to display them. In a progressive frame, the horizontal lines of pixels making up the frame are displayed sequentially from top to bottom. In contrast, an interlaced frame is produced by displaying two fields sequentially, one field (called the top field) containing the top line of the frame and every other subsequent line, and the other field (called the top field). The bottom field) contains the second row from the top and each subsequent row, thereby including the bottom row of the frame. Interlaced frames rely on the fact that the first field of displayed pixels takes time to decay from the display device, during which time the second field is displayed in order to create the illusion of a single f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N5/44H04N7/0147H04N21/234309
Inventor P·埃朗戈文O·巴顿
Owner PROJECT GIANTS LLC