Bitrate damper for selecting quantization levels for image encod

Details Bitrate damper for selecting quantization levels for image encod Bitrate damper for selecting quantization levels for image encod

1995-09-28

1999-07-20

Moore, David K.

Image analysis

Image compression or coding

382251, 382239, 348415, 348405, 348419, G06K 936, H04N 712

Patent

active

059265698

ABSTRACT:
For each image, an initial set of quantization (Q) levels is selected based on the pixel data. The pixel data are transformed to blocks of transform coefficients. The initial set of Q levels is incremented and decremented. The incremented Q levels are used to generate a low estimate of bitrate for the transform coefficients and the decremented Q levels are used to generate a high estimate of bitrate for the transform coefficients. The low and high bitrate estimates are compared to a specified target bitrate to generate Q-level adjustments. The Q-level adjustments are used to select the Q levels to encode fully the quantized coefficients of the current image in the sequence of images.

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