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Method and apparatus for providing rate control for panel-based real-time video encoder

  • US 7,564,901 B2
  • Filed: 10/09/2006
  • Issued: 07/21/2009
  • Est. Priority Date: 10/09/2006
  • Status: Active Grant
First Claim
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1. A method for panel-based rate control for encoding real-time digital video, comprising:

  • performing bit allocation by assigning and updating a target rate for a group of pictures (GOP), and computing a target rate for a picture of type I, P or B in frame or field within said GOP from said target rate of said GOP, where said picture is processed on multiple panels; and

    performing rate control by adjusting guantization parameters to achieve said target ratesprotecting both encoder and decoder buffers from overflowing or underflowing before encoding a picture, wherein protecting the encoder buffers comprises checking and adjusting the target number of bits assigned for a picture according to the following two conditions;

    if
    buffer_occupancy +Tpic

    target>

    α

    ×

    buffer_size, then
    Tpic

    target

    ×

    buffer_size−

    buffer_occupancy; and

    if
    buffer_occupancy+Tpic

    target

    bit−

    rate/pic_rate<

    (1−

    α



    buffer_size, then
    Tpic

    target=(1−

    α



    buffer_size−

    buffer

    occupancy+bit
    _rate/pic_rate.

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