UBC Theses and Dissertations
An inexpensive, high resolution scan camera Wang, Shuzhen
The use of digital imaging devices has been growing very fast and having amazing influence over the last decade. Being easier to integrate with other digital media, digital imaging is taking the place of analog imaging in more and more fields. Although the resolution and color quality of digital cameras have reached those of 35mm films, there are still a number of applications which require better quality, such as museum catalogs, professional digital photography and research in image based modeling and rendering. These applications all benefit from high resolution digital imaging. Our work extends digital photography in this particular direction. We present the design of a high-resolution scan camera using a flatbed scanner as the backend of a large format camera. The scan camera we built can take images with the resolution of up to 122 million pixels, while the camera itself can be built from off-the-shelf components for only 2,000 dollars. If we simply attach the two parts of the system together (the large format camera and the flatbed scanner) in their original setup, the system won't work properly because of mechanical and optical constraints. We dealt with these constraints by removing the light source and lenses from the scanner, and aligning the scanner with the imaging plane of the view camera. Due to the changed optics in the scanner, we can not directly use the commercial scanning software from the vendor. Instead, we get the raw image data from the scanner, then do denoising and calibration to acquire high quality images. A more advanced process is proposed to first detect artifact features, then remove them by image inpainting. Finally, some quantitative measurement of the light sensitivity and the optical resolution of the camera are obtained.
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