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Uncalibrated Synthetic Aperture for Defocus Control

Uncalibrated Synthetic Aperture for Defocus Control. Natsumi Kusumoto Shinsaku Hiura Kosuke Sato Graduate School of Engineering Science, Osaka University CVPR2009 . Introduction. Defocus Only a handheld compact camera Take set of images randomly Can focus at any depth

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Uncalibrated Synthetic Aperture for Defocus Control

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  1. Uncalibrated Synthetic Aperture for Defocus Control Natsumi Kusumoto Shinsaku Hiura Kosuke Sato Graduate School of Engineering Science, Osaka University CVPR2009

  2. Introduction • Defocus • Only a handheld compact camera • Take set of images randomly • Can focus at any depth • Blur kernel with different size,shape or density Input

  3. Outline • Introduction • Uncalibrated Synthetic Aperture • Correction of image deformation • Estimation of viewpoint locations • View interpolation • Defocus with various PSFs • Result

  4. Uncalibrated Synthetic Aperture

  5. Correction of image deformation • (a)Different shape • (b)undesirable image magnification • Can’t rectify • Not all viewpoints are on the same plane • Calculate homography • Specify four points • Find corresponding points

  6. Estimation of viewpoint locations • Projective reconstruction • 1.Find corresponding feature points • 2.Calculate F using correspondence • 3.Find camera metrices from F • But it is not enough stable • because the camera motion is so small

  7. Estimation of viewpoint locations • Use registered images • Feature points are detected • Estimation the relative location of viewpoints • By calculating the average vector of all disparities

  8. View interpolation • Morphing • Use a depth dependent technique • Actual depth is not necessary • Delaunay triangulation for feature points

  9. View interpolation • Delaunay triangulation for viewpoints • Decide whitch images are used to interpolate the image at each viewpoint

  10. Defocus with various PSFs • (a)uniform intensity • Intensity discontinuities in defocus image • (b)weight intensity • It can soften the edges of defocus • (c),(d) for further artistically creative photographs

  11. Result • Evaluation of estimatied viewpoint location • Nikon D200 DSLR • Nikkor 35mm F2D lens Mouted on Manfrotto 303SPH tilt-slide platform • Note : 800mm >> 2.5mm

  12. Result Input • (a)Use the nearest 4 corners to focus on the frontal object • (b)Specify by user

  13. Result • Defocusing using handheld camera • Panasonic DMC-FX8 • Without tripod • Only 3 photos

  14. Result • Different types of PSFs • The weighted circular PSF is the best

  15. Discussion • Still have some artifacts • Due to the process of imterpolation =>wrong correspondence =>blurry edges cause by the triangles

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