Code amount controlling method for coded pictures

Details Code amount controlling method for coded pictures Code amount controlling method for coded pictures

1996-07-16

1998-05-12

Au, Amelia

Television

Bandwidth reduction system

Data rate reduction

348419, H04N 712

Patent

active

057513600

ABSTRACT:
The invention provides a code amount controlling method wherein, when code amount control is performed in units of a GOP, data do not remain in a buffer even if data with which a moving picture comes to an end intermediately of the last GOP are compressed. A control parameter setting section gets the number of frames from among all frames of picture data of an object of compression for which coding processing has not been performed, gets the number of frames in one GOP, and discriminates from the remaining frame number and the frame number in the GOP whether or not coding processing comes to an end intermediately of the last GOP. When coding processing comes to an end intermediately of the last GOP, the last GOP and a directly preceding GOP are coupled to vary the frame structure, and an aimed code amount is calculated. Also another method wherein an aimed code amount of the last GOP is compulsorily determined making use of an aimed code amount of the preceding GOP may be utilized. Using the thus obtained aimed code amount, a Q-scale of the macroblocks is calculated and compression coding is performed.

REFERENCES:
patent: 5231484 (1993-07-01), Gonzales et al.
patent: 5283646 (1994-02-01), Bruder
patent: 5565920 (1996-10-01), Lee et al.
patent: 5606371 (1997-02-01), Klein Gunnewiek et al.
patent: 5617150 (1997-04-01), Nam et al.
Test Model 5, Draft Revision 2, Apr. 7, 1993, pp. 54-58.
Liang-Wei Lee et al, "On the Error Distribution and Scene Change for the Bit Rate Control of MPEG", IEEE Transactions on Consumer Electronics, vol. 39, No. 3, Aug. 1993, pp. 545-554.

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