| http://www.w3.org/ns/prov#value | - When directional sharpness magnitudes p?? in n directions are used where n is an integer equal to or greater than 3, the astigmatism and focus correction quantity computation image processing circuit 53 applies a sinusoidal waveform to these pieces of data to find the astigmatism magnitude ??, the astigmatism direction ?? and the focal offset z from a phase, an amplitude and an offset thereof.
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