IMAGE ENCODING METHOD, IMAGE CODING INSTRUMENT, IMAGE CODING PROGRAM, AND RECORDING MEDIUM RECORDING THE PROGRAM

摘要

PROBLEM TO BE SOLVED: To make it possible to encode an input image by a target code amount with little calculation cost when hierarchically encoding the image in spatial resolution.

SOLUTION: First, a testing value of quantizing step width Wois set, and a coding quantity of a base layer Lois calculated by coding only the base layer using the test value Wo. Next, quantizing step width W for realizing the target coding quantity L is estimated by inserting the test value of the quantizing step width Woalready set, the calculated base layer coding quantity Lo, and the target coding quantity L of the total image to an function W = f(L, Lo, Wo) which is established among L, Lo, Wo, and W. Next, all layers are encoded using the estimated quantizing step width W. Following this configuration, the input image of the target coding quantity can be created by small calculation time because quantizing step width of the target coding quantity can be estimated by encoding the base layer only one time.

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