Film-to-video format detection for digital television
AssigneeTexas Instruments Incorporated
InventorsRobert J. Gove, Richard C. Meyer, Stephen W. Marshall
Life of this patent
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Abstract
A film-to-video format detector (24) for a digital television receiver (10). The detector (24) receives pixel data from a current field and a second preceding field. It determines a set of pixel difference values, sums them to obtain a field difference value, and compares the field difference value to a threshold. These steps are repeated to obtain a series of field difference indicators. This series is analyzed to determine whether it has a pattern corresponding to a film-to-video format.
Claims20
A format detector for a receiver of a video signal, comprising:
- a pixel comparator for comparing data values of pixels of a current field of said video signal with data values of corresponding pixels of a second preceding field of said video signal, thereby obtaining a set of pixel difference values;
- an adder for adding together the absolute values of said set of pixel difference values, thereby obtaining a field difference value;
- a threshold comparator for comparing said field difference value to a predetermined threshold, thereby generating a binary field difference indicator;
- and
- a sequence analyzer for determining whether a series of field difference indicators follows a recognizable pattern.
A method of detecting the format of an incoming video signal, comprising the steps of:
- receiving a first pixel data value from a pixel of a current field of said video signal;
- receiving a second pixel data value from the corresponding pixel of a second preceding field of said video signal;
- calculating the difference between said first and second pixel values to obtain a pixel difference value;
- repeating said receiving steps and said calculating step for a predetermined number of pixels;
- summing the absolute values of the pixel difference values obtained in said repeating step to obtain a field difference value;
- determining whether said field difference value exceeds a predetermined threshold to obtain a binary field difference indicator;
- repeating all of the above steps to obtain a series of field difference indicators for a continuous series of fields;
- and
- analyzing said series of field difference indicators to determine whether it has a pattern corresponding to a film-to-video conversion.
A digital processing system for a receiver of a video signal, comprising:
- a field buffer for storing pixel data from at least three fields of data of said video signal;
- a format detector for detecting the format of said video signal, wherein said format detector has a pixel comparator for comparing data values of pixels of a current field with data values of corresponding pixels of a second preceding field, thereby obtaining a set of pixel difference values;
- an adder for adding together the absolute values of said set of pixel difference values, thereby obtaining a field difference value;
- a threshold comparator for comparing said field difference value to a predetermined threshold, thereby generating a binary field difference indicator;
- a sequence analyzer for determining whether a series of field difference indicators follows a pattern corresponding to a film-to-video conversion;
- and
- a processing system for receiving said pixel data and for receiving a format control signal from said format detector, and for processing said pixel data in accordance with said format control signal.
Dependencies are inferred from the claim text.