Still picture processing for MPEG-2 video
First Claim
Patent Images
1. A method for encoding and transmitting still picture images comprising:
- receiving video frames at an input frame rate;
capturing ones of said video frames at a still picture capture rate which is less than the input frame rate;
providing the captured video frames to a video compressor at the input frame rate, wherein an already captured video frame is repeatedly provided to said video compressor at the input frame rate until a new frame is captured; and
transmitting the captured video frames after compression by said video compressor at a still picture repetition rate that is no less than said capture rate.
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Abstract
Still picture images are encoded and transmitted at reduced rates using the MPEG-2 standard. Video frames are captured for processing at a still picture capture rate that is lower than the video input frame rate. The captured frames are compressed as Intra frames at the input frame rate. Selected ones of the compressed frames are inserted in the MPEG-2 transport stream for communication to a decoder at a still picture repetition rate which is no less, in frames per second, than the capture rate.
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Citations
26 Claims
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1. A method for encoding and transmitting still picture images comprising:
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receiving video frames at an input frame rate;
capturing ones of said video frames at a still picture capture rate which is less than the input frame rate;
providing the captured video frames to a video compressor at the input frame rate, wherein an already captured video frame is repeatedly provided to said video compressor at the input frame rate until a new frame is captured; and
transmitting the captured video frames after compression by said video compressor at a still picture repetition rate that is no less than said capture rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for encoding and transmitting still picture images comprising:
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a selector adapted to receive video frames at an input frame rate and capture a subset of the video frames at a still picture capture rate which is less than the input frame rate;
a video compressor coupled to receive and compress the captured video frames at the input frame rate, wherein an already captured video frame is repeatedly provided to said video compressor at the input frame rate until a new frame is captured; and
a buffer coupled to receive the captured video frames after compression by said video compressor for subsequent transmission at a still picture repetition rate that is no less than said capture rate. - View Dependent Claims (11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26)
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15. A method for encoding and transmitting still picture images comprising:
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compressing video frames at an input frame rate;
capturing ones of said compressed video frames at a still picture capture rate which is less than the input frame rate; and
providing the captured video frames for transmission at a still picture repetition rate that is no less than said capture rate;
wherein if the still picture repetition rate is greater than the capture rate, an already captured video frame is repeatedly provided for transmission at the still picture repetition rate until a new frame is captured.
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23. Apparatus for encoding and transmitting still picture images comprising:
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a video compressor coupled to receive and compress video frames at an input frame rate;
at least one memory coupled to store ones of said compressed video frames at a still picture capture rate which is less than the input frame rate;
said at least one memory being adapted to provide the stored video frames for transmission at a still picture repetition rate that is no less than said capture rate;
wherein if the still picture repetition rate is greater than the capture rate, an already stored video frame is repeatedly provided from the memory for transmission at the still picture repetition rate until a new frame is stored.
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Specification