| 摘要 |
PROBLEM TO BE SOLVED: To expand a measurable range to a relatively far distance even if the reflection factor of an object is small by preventing the erroneous measurement of a distance by the detection of the object exceeding the measurable range. SOLUTION: A light emitting source 2 applies light that is modulated by a modulation signal with a prescribed period to a target space, and a photodetector 1 images the target space. An image generation section 4 obtains the distance to an object Ob according to the phase difference in the modulation signal between light applied to the target space from the light emitting source 2 and reflection light that is reflected by the object Ob in the target space and is received by the photodetector 1. And the image generation section 4 compares a reference threshold that is set according to distance so that the distance to the object Ob becomes smaller with the representative value of the quantity of received light in the distance range to the measurable maximum distance prescribed by the period of the modulation signal, and does not adopt the obtained distance when the representative value is smaller than the reference threshold to the obtained distance as the pixel value of the distance image. COPYRIGHT: (C)2006,JPO&NCIPI
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