| 摘要 |
A CPU reads out image data from a memory and sets the image data of a trial line number in a coding amount estimation device. The coding amount estimation device refers to a parameter table, generates coding parameters formed by combining parameters, and sets the coding parameters in a coder. The coding amount estimation device causes the coder to execute JBIG coding of the image data of the trial line number and estimates a coding amount. When there remains no untried parameter combination from the parameter table, the coding amount estimation device sets the coding parameters, which provide a minimum coding amount, in the coder as optimal coding parameters. After the optimal coding parameters have been set in the coder, the CPU reads out image data of all lines from the memory and causes the coder to execute JBIG coding.
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