IMAGE ENCODING METHOD, IMAGE ENCODING DEVICE, IMAGE DECODING METHOD, IMAGE DECODING DEVICE, AND IMAGE ENCODING/DECODING DEVICE

摘要

This image encoding method, which converts the error signal of an image signal and a predicted image signal to a frequency coefficient, includes: an alteration step (S212) for, in a manner so as to conform to the expected value distribution of the error signal, altering the sign or arrangement of elements in a conversion matrix used in converting an error signal having a predetermined expected value distribution; and a conversion step (S216) for converting the error signal into the frequency coefficient using the conversion matrix of which the sign or arrangement of elements has been altered.