Imaging spectrometers based on prism-grating-prism (PGP) have advantage of direct vision, as a basis for the design of an optical system for a spectrometer and camera dual-use, the system can plug the light splitting element to switch between the spectrometer and camera. This paper has discussed the working principles and structure of the PGP and spectrometer, collimating and focusing lens design principles, then the design result has been presented. The spectral range of the system is 400-800nm, the pixel size of CCD used is 10um × 10um, 1010 × 1018 pixels, the object space numerical aperture is 0.1. In order to reduce the cost and eliminate aberration, collimating lens and focusing lens have symmetric structure, in order to improve the diffraction efficiency, PGP uses the volume phase holographic transmission grating. After optimization the design by ZEMAX software, the whole spectral range resolution is better than 1nm in average, the MTF at Nyquist frequency is greater than 0.7, the length of the whole system is 87mm.
A digital camera capture images by covering the sensor surface with a color filter array (CFA), only get a color
sample at pixel location. Demosaicking is a process by estimating the missing color components of each pixel to get a
full resolution image. In this paper, a new algorithm based on edge adaptive and different weighting factors is proposed.
Our method can effectively suppress undesirable artifacts. Experimental results based on Kodak images show that the
proposed algorithm obtain higher quality images compared to other methods in numerical and visual aspects.
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