Video transmission system video transmission unit and methods of encoding decoding video data
First Claim
1. A method of encoding in a video transmission system, the method comprising the steps of:
- an encoder determining whether the encoder has been instructed to transmit a video/image frame sequence to a decoder; and
if the encoder determines that it has been instructed to transmit a video sequence to the decoder, the encoder checking whether an Intra-coded frame has previously been transmitted to the decoder;
sending an Intra-coded frame to the decoder if one has not been transmitted for that session; and
otherwise, transmitting Inter-coded frames to the decoder.
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Accused Products
Abstract
A video transmission system (400) includes a plurality of video transmitters (420, 430, 440), each video transmitter transmitting at least one respective video image. At least one video receiver (410) receives video images from the video transmitters. The at least one video receiver includes a plurality of frame stores (412, 414, 416) for storing video images from the respective plurality of video transmitters. This provides advantages that: surveillance on band-limited multiplexed channels is much faster, without sacrificing the spatial image resolution of the object(s) of interest; images recovered have better perceptual quality; there is higher spatial resolution for the object(s) of interest; there is quick first image display time, and subsequent video frames will be transmitted rapidly. A CCTV system can thus poll multiple video transmitters more quickly.
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Citations
37 Claims
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1. A method of encoding in a video transmission system, the method comprising the steps of:
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an encoder determining whether the encoder has been instructed to transmit a video/image frame sequence to a decoder; and
if the encoder determines that it has been instructed to transmit a video sequence to the decoder, the encoder checking whether an Intra-coded frame has previously been transmitted to the decoder;
sending an Intra-coded frame to the decoder if one has not been transmitted for that session; and
otherwise, transmitting Inter-coded frames to the decoder. - View Dependent Claims (2, 3, 6, 19)
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4. A method of decoding in a video transmission system, the method comprising the steps of:
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receiving a compressed and encoded video sequence from a video encoder;
determining a camera or encoder reference indication of the received video sequence;
a decoder checking to see if said determined reference indication corresponds to the reference indication of the stored picture memory being used for the current decoding; and
switching the picture memory being used for processing by the decoder, if the reference indication does not correspond to said stored picture memory. - View Dependent Claims (5, 7, 34)
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8. A method of polling cameras in a video transmission system having a plurality of encoding video transmission cameras and at least one decoding video receiving unit, the method comprising the steps of:
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receiving, into one of a plurality of frame stores at the decoding video receiving unit, picture update information transmitted from a first camera;
the decoding video receiving unit signalling to the first camera to stop encoding video images and stop transmitting a video sequence;
the decoding video receiving unit signalling to a second camera to start encoding and transmitting; and
receiving, into another of the said plurality of frame stores, picture update information transmitted from the second camera. - View Dependent Claims (9, 10, 11, 12, 13, 14, 35)
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15. A method of controlling multiple video encoders in a video transmitter system, the method comprising the step of storing a latest reconstructed frame from each camera, such that subsequent transmissions from a camera are based on said stored latest reconstructed frame from that camera, the step of storing a latest reconstructed frame being in response to either:
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an encoder reaching an end of its transmission time;
orinterrupting a video transmission of an encoder of a first camera by a second camera with higher priority. - View Dependent Claims (16, 17, 18, 36)
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20. A video transmission system comprising:
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a plurality of video transmitters, each video transmitter transmitting at least one respective video image;
at least one video receiver, for receiving video images from the plurality of video transmitters, the at least one video receiver having a plurality of frame stores, for storing video images from the respective plurality of video transmitters, the video receiver receiving a compressed and encoded video image from the respective video transmitter. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 37)
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- 28. A video encoder comprising a receiver for receiving a video image for encoding and transmitting said video image to a video decoder, the video encoder being operably coupled to a coding control block, said coding control block initiating transmission of a single Intra-coded video frame, followed by subsequent transmission of predicted frames, such subsequent predicted frames being the only transmitted frames irrespective of whether there is an interruption in the video transmission.
- 30. A video decoder comprising a receiver for receiving video images, operably coupled to a plurality of frame stores for receiving and storing a plurality of reconstructed video images generated from compressed and encoded transmitted images from a plurality of video transmitters.
Specification