| 摘要 |
PURPOSE:To enable the area type image sensor of a TV camera, etc., to detect an image without any influence of a stripe pattern upon the entire visual field by setting the cutoff wavelength range of the light shield part of a mask pattern outside a wavelength range in use and making a contrast detection wavelength range coincident with the cutoff wavelength part of the mask pattern. CONSTITUTION:The light cutoff part of a striped pattern mask 3 cuts off only light whose wavelength is longer than certain wavelength and the transmission part transmits light with any wavelength; and incident light to the image sensor 16 which picks up an image of a reflected light pattern is limited by a filter 15 to make its wavelength a little bit longer than its original wavelength, and incident light to detectors 9 and 11 which observe the surface of a body to by measured is limited by a filter 14 to make its wavelength a little bit shorter than its original wavelength. Consequently, even the area type detector 16 detects the defocusing of a striped pattern projection type without sacrificing the visual field by a pattern projected in an image plane. |
