said model parameter identification unit identifies the model parameter from the simultaneous equations describing the input/output relationship using the two dimensional linear prediction model regarding each pixel of the to be tested image as an output and letting the linear coupling of pixels around {HEAD ~ each pixel} be an input with respect to the decomposition images corresponding in number to the reference points and {TAIL ~ a reference frequency division image} which does not generate decomposition images 
said model parameter identification unit identifies the model parameter from the simultaneous equations describing the input / output relationship using the two dimensional linear prediction model regarding each pixel of the to be tested image as an output and letting the linear coupling of pixels around { HEAD ~ each pixel } be an input with respect to the decomposition images corresponding in number to the reference points and { TAIL ~ a reference frequency division image } which does not generate decomposition images
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