نتایج جستجو برای: pinhole
تعداد نتایج: 1631 فیلتر نتایج به سال:
Observing that many visual effects (depth-of-field, motion blur, soft shadows, spectral effects) and several sampling modalities (time, stereo or light fields) can be expressed as a sum of many pinhole camera images, we suggest a novel efficient image synthesis framework that exploits coherency among those images. We introduce the notion of “distribution flow” that represents the 2D image defor...
BACKGROUND Vision screening study in primary school children has not been done in Bayelsa State, South-South Nigeria. This study was therefore conducted to screen primary school children for refractive error in Bayelsa State and use the data to plan for an effective school Eye Health Program. METHODS A cross sectional study on screening for refractive error in school children was carried out ...
OBJECTIVES Pinhole SPECT which permits in vivo high resolution 3D imaging of physiological functions in small animals facilitates objective assessment of pharmaceutical development and regenerative therapy in pre-clinical trials. For handiness and mobility, the miniature size of the SPECT system is useful. We developed a small animal SPECT system based on a compact high-resolution gamma camera ...
To achieve autonomous indoor mobile robot navigation, the robot needs to identify the direction, obstacle position and other information. This paper describes a solution for indoor mobile robot navigation and obstacle distance detection which based on monocular vision. We use Hough transform to find the straight lines in the corridor environment which were used to find the vanishing point as th...
We quantitatively analyze the rendering quality of image-based rendering (IBR) algorithms using per-pixel depth. Assuming the ideal pinhole camera model, we extend the error aggregation framework proposed in a companion paper to 2D occluded scenes and 3D unoccluded scenes. For 2D occluded scenes, we measure the effects of jumps in sample intervals around the discontinuities of the virtual image...
BACKGROUND Small animal imaging has recently been the subject of increasing interest and specific imaging devices in particular for positron emission tomography (PET) have been developed. To bypass limitations arising from high acquisition costs and dependence on an in-house cyclotron unit inevitably associated with PET, a conventional gamma camera has been equipped with a pinhole collimator an...
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