METHOD AND DEVICE FOR RATE CONVERSION OF IMAGE ENCODED DATA

Japanese Patent JP3208039

B2

PURPOSE: To provide a rate conversion device for image encoded data which has performance similar to trans-encoding by using a means which is simpler than the trans-encoding.
CONSTITUTION: Image encoded data 1a which are inputted from an encoded data input terminal 1 and encoded at an encoding rate R1 are supplied to a variable length decoder 2. The variable length decoder 2 decodes the data after variable length encoding and DCT encoding information 2a is inputted to an inverse quantizer 3. A quantizer controller 5 finds a quantization step required for requantization to control a quantizer 6. The DCT encoding information 2a quantized inversely by the inverse quantizer 3 is restored to a DCT coefficient 3a. This DCT coefficient 3a is quantized again by the quantizer 6 in a quantization step Q determined by the quantizer controller 5 and inputted to a variable length encoder 7. The variable length encoder 7 outputs image encoded data 7a, encoded at an encoding rate R2, to an encoded data output terminal 8 after the variable length encoding.

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JP3359143	DEVICE AND METHOD FOR PROCESSING IMAGE
JP4588122	Parallel decoding of interleaved data streams in an MPEG decoder

Yasuyuki Nakajima
Digging
Tamotsu Kano

JP7710095A

September 10, 2001

March 09, 1995

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KDDI Co., Ltd.

G06T9/00; H04N19/60; H04N19/126; H04N19/134; H04N19/136; H04N19/14; H04N19/146; H04N19/176; H04N19/196; H04N19/40; H04N19/42; H04N19/423; H04N19/46; H04N19/70; H04N19/85; H04N19/91; (IPC1-7): H04N7/30

JP6343156A
JP7107461A
JP7212240A
JP7312756A
JP884339A

Kazuki Tanaka (1 person outside)

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