China
Africa
Explore chapters and articles related to this topic
2 The Toolbox
Published in Lasse Svanberg, The EDCF Guide to Digital Cinema Production, 2013
A bayer filter is a colour filter array in a checkerboard pattern that is placed over a single chip ccd or cmos imager to create a colour image. 50% of the pixels are filtered green, 25% red, and 25% blue. Averaged together, a Bayer chip misses up to 67% of the colour information in the image. This isn't as bad as it sounds. Complex calculations from surrounding pixels are made to interpolate the missing colours at each pixel. However the actual detail is more difficult to “guess” and can result in artefacts or softness.
A dual-projector three-dimensional measurement model for shading problem of micro-scale object complex surface
Published in Journal of Modern Optics, 2023
Cheng Gui, Huikai Zhong, Yanjun Fu, Kejun Zhong, Baiheng Ma, Zhanjun Yan
In this work, the shadow area was reduced by adding an auxiliary light source. A new dual-projection structured light system was also established, which solved the shadow problem faced by the traditional structured light measurement system. A monolithic colour camera was employed with a Bayer filter so that each pixel on the CCD chip can produce only one of the red, green, or blue colour values. Firstly, spatial colour interpolation is performed by the processing unit of the camera to retrieve the remaining two filtered colour components. Hence, all pixels have information about these three colours. Second, in visible light, the wavelength of the red light is 630–760 nm, that of the green light is 500–570 nm, and that of the blue light is 430–450 nm. Therefore, in the images collected by the colour camera, generally, the green channel significantly overlaps with the red channel and the blue channel seriously, while the colour crosstalk between the red channel and the blue channel is very small. This effect implies that the red and blue overlapping fringe pattern can be separated.