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A hybrid image coder with vector quantizer

โœ Scribed by Stefano Tubaro

Book ID
103958532
Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
911 KB
Volume
2
Category
Article
ISSN
0923-5965

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โœฆ Synopsis

In this paper the scheme of a hybrid coder is presented, it uses a motion compensated predictor to obtain, from the present image and the previously coded one, a new image which represents the motion compensated luminance differences. Then, this new image is vector quantized. Each vector contains 16 elements (obtained from a square block of 4 x 4 pels). Four different codebooks are used for the quantization, taking into account the local image detail. To reconstruct the images at the receiver side, the estimated motion fie,! must be transmitted; this is done using certain adequate compression techniques. At about 0.5 bpp, the coded images, obtained by proper simulations, have good quality, close to that obtained with a hybrid DCT coder.

KeDvords. Hybrid coding, motion compensated luminance difference, vector quantization.

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