Motion video signal encoder and encoding method
First Claim
1. A method for encoding a motion video signal, the method comprising:
- determining a desired size for a first frame of the motion video signal;
encoding the first frame of the motion video signal to form an encoded frame;
determining an encoded size of the encoded frame;
comparing the encoded size to the desired size;
adjusting an encoding parameter such that encoding the first frame according to the encoding parameter as adjusted would form a different encoded frame having a size closer to the desired size than the encoded size is to the desired size; and
wherein the adjusting employs first and second adjustment mechanisms, the first adjustment mechanism comprising a pre-compensator and the second adjustment mechanism comprises a first encoding adjuster and a second encoding adjuster that is based at least in part on a damping factor which reduces overcorrection of the encoding parameter; and
encoding a second frame of the motion video signal according to the encoding parameter as adjusted.
1 Assignment
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Accused Products
Abstract
A motion video signal encoder maximizes image quality without exceeding transmission bandwidth available to carry the encoded motion video signal by comparing encoded frames of the motion video signal to a desired size of frame. If the size of encoded frames differ from the desired size, encoding is adjusted to produce encoded frames closer in size to the desired size. In addition, a cumulative bandwidth error records an accumulated amount of available bandwidth. The cumulative bandwidth error is adjusted as time elapses to add to the available bandwidth and as each frame is encoded to thereby consume bandwidth. As the cumulative bandwidth error grows in magnitude above or below zero, encoding is adjusted as needed to either improve image quality to more completely consume available bandwidth or to reduce image quality to thereby consume less bandwidth and to thereby cause the cumulative bandwidth error to move toward zero. Rapid changes in the amount of change or motion in the motion video signal are detected by comparing the amount of change between two consecutive frames and filtering the amount of change with previously measured amounts of change. Encoding is pre-compensated according to the filtered measurement of rapid change.
112 Citations
16 Claims
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1. A method for encoding a motion video signal, the method comprising:
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determining a desired size for a first frame of the motion video signal; encoding the first frame of the motion video signal to form an encoded frame; determining an encoded size of the encoded frame; comparing the encoded size to the desired size; adjusting an encoding parameter such that encoding the first frame according to the encoding parameter as adjusted would form a different encoded frame having a size closer to the desired size than the encoded size is to the desired size; and
wherein the adjusting employs first and second adjustment mechanisms, the first adjustment mechanism comprising a pre-compensator and the second adjustment mechanism comprises a first encoding adjuster and a second encoding adjuster that is based at least in part on a damping factor which reduces overcorrection of the encoding parameter; andencoding a second frame of the motion video signal according to the encoding parameter as adjusted. - View Dependent Claims (2, 3, 4, 5)
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6. A computer readable medium useful in association with a computer which includes a processor and a memory, the computer readable medium having computer instructions stored thereon which are configured to cause the computer to encode a motion video signal by performing the steps of:
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determining a desired size for a first frame of the motion video signal; encoding the first frame of the motion video signal to form an encoded frame; determining an encoded size of the encoded frame; comparing the encoded size to the desired size; adjusting an encoding parameter such that encoding the first frame according to the encoding parameter as adjusted would form a different encoded frame having a size closer to the desired size than the encoded size is to the desired size; and
wherein the adjusting employs first and second adjustment mechanisms, the first adjustment mechanism comprising a pre-compensator and the second adjustment mechanism comprises a first encoding adjuster and a second encoding adjuster that is based at least in part on a damping factor which reduces overcorrection of the encoding parameter; andencoding a second frame of the motion video signal according to the encoding parameter as adjusted. - View Dependent Claims (7, 8, 9)
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10. A computer system comprising:
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a processor; a memory operatively coupled to the processor; and a motion video signal encoder which executes in the processor from the memory and which, when executed by the processor, causes the computer to encode a motion video signal by performing the steps of; determining a desired size for a first frame of the motion video signal; encoding the first frame of the motion video signal to form an encoded frame; determining an encoded size of the encoded frame; comparing the encoded size to the desired size; adjusting an encoding parameter such that encoding the first frame according to the encoding parameter as adjusted would form a different encoded frame having a size closer to the desired size than the encoded size is to the desired size; and
wherein the adjusting employs first and second adjustment mechanisms, the first adjustment mechanism comprising a pre-compensator and the second adjustment mechanism comprises a first encoding adjuster and a second encoding adjuster that is based at least in part on a damping factor which reduces overcorrection of the encoding parameter; andencoding a second frame of the motion video signal according to the encoding parameter as adjusted. - View Dependent Claims (11, 12, 13)
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14. A method, comprising:
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determining a desired size for a first frame of a motion video signal; encoding the first frame of the motion video signal to form an encoded frame; determining an encoded size of the encoded frame; comparing the encoded size to the desired size; adjusting an encoding parameter such that encoding the first frame according to the encoding parameter as adjusted would form a different encoded frame having a size closer to the desired size than the encoded size is to the desired size, and wherein the adjusting employs first and second adjustment mechanisms, the first adjustment mechanism comprising a pre-compensator and the second adjustment mechanism comprising a first encoding adjuster and a second different encoding adjuster; and encoding a second frame of the motion video signal according to the encoding parameter as adjusted. - View Dependent Claims (15, 16)
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Specification