| 摘要 |
For the purpose of accurately calculating the average value M of original complex observed signals S from an absolute-value image produced by the complex observed signals S, in Step A1, the average value Ma of pixel values |S| of the absolute-value image in a local region is calculated by: <paragraph lvl="0"><in-line-formula>Ma=SIGMA|S|/k, </in-line-formula>wherein the number of pixels in the local region is represented as k. In Step A2, the average value M of the original complex observed signals S is calculated by the following equation: <paragraph lvl="0"><in-line-formula>M=alpha.ƒ-1 (Ma/alpha), </in-line-formula>wherein ƒ-1 (Ma/alpha) is an inverse function of the function Ma/alpha=ƒ(M/alpha) represented as: <paragraph lvl="0"><in-line-formula>Ma/alpha=∫∫{|M/alpha+(X+iY)|exp{-(X2+Y2)/2}/2pi}dX dY. </in-line-formula>
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