(新)斯坦福顯微鏡光場――熒光蠟

1、(新 斯坦福顯微鏡光場熒光蠟(The (New Stanford Microscope Light FieldsFluorescentCrayon Wax數(shù)據(jù)介紹：The specimen is a 200-micron-tall tower of fluorescent crayon wax. The objective is 20x/0.5 (dry, used without a cover slip. The parallax you see in this light field is normally unavailable to the microscopist, who onl

2、y sees a single, orthographic view of the specimen.關(guān)鍵詞：斯坦福, 顯微鏡, 光場, 校準, 刻度, Stanford,LightField,Microscope,original camera images,Calibration,數(shù)據(jù)格式：IMAGE數(shù)據(jù)詳細介紹：The (New Stanford Microscope Light FieldsFluorescent CrayonWaxOverviewThe Computer Graphics Laboratory at Stanford University has acquired s

3、everal light fields for research in computer graphics and vision. We are making this data publicly available to researchers. The light fields may be usedfor academic and research purposes, but are not to be used for commercial purposes, nor should they appear in a product for sale without our permis

4、sion. If you use these models in a publication, please credit the Stanford Computer Graphics Laboratory.Microscope Light FieldsThe light fields in this section were acquired by Marc Levoy. More detail on these datasets can be found at the Light Field Microscope page. Some things to be aware of when

5、viewing these light fields using the Flash-based viewer: T hey are low resolution. Unlike the other light fields on this page, thesewere captured with a single snapshot from a single camera. This means fewer total samples are available to record all the spatial and angular information, so the ouput

6、spatial resolution is low. Even if we hadmultiple cameras, diffraction places a fundamental physical limit on the product of spatial and angular resolution we could capture. If youre more comfortable thinking of light as particles than as waves, then one way to think of this is as an application of

7、the Heisenberg uncertainty principle. You can either know where a photon is (high spatial resolution, or know its momentum (high angular resolution, i.e. views from lots of directions, but you cant know both with high accuracy. T he output looks pixelated. This occurs because the original light fiel

8、dshave low spatial resolution, so the output window is upsampled foreasier viewing. To view the light field at the original small resolution, use the with no magnification links. You can also change the magnification by tweaking the zoom parameter in the url. T he output becomes darker when using th

9、e full aperture. This occursbecause brightness falls off as you approach the edges of the aperture in a microscope, hence these samples are dim. You can see this by using a pinhole aperture and panning slowly to the edge of the view for each light field, or slowly shrinking the aperture from full to

10、 pinhole. Our LFDisplay viewer (see below normalizes the rendered imageautomatically to avoid this darkening. A sudden jump happens at the very edges of the aperture. This occurswhen adjacent lenslet images slightly overlap in the rectified camera image, which means views from opposite sides of the

11、microscopeaperture add together on the sensor. Tweaking the numerical aperture (NA of the microscope objective or the F-number of the microlenses would have eliminated this crosstalk.Fluorescent Crayon Wax400 views on a 20x20 grid, image resolution 170x114The specimen is a 200-micron-tall tower of f

12、luorescent crayon wax. Theobjective is 20x/0.5 (dry, used without a cover slip. The parallax you see in this light field is normally unavailable to the microscopist, who only sees a single, orthographic view of the specimen.Data FormatClick on the Light Fields link above to access the datasets. Each

13、 light field is available as a compressed archive of images in PNG format. We provide the original camera images as well as keystone corrected images. For somescenes, calibration information (such as homographies for keystone correction and camera positions is provided as a text file; for others, si

14、mple calibration targets are visible in the original camera images. Click the Calibration link for more details.AcquisitionThese light fields were acquired using the Stanford Multi-Camera Array, the light field gantry, a simple Lego Mindstorms gantry you could build at home, and the light field micr

15、oscope. Click the Acquisition link for more details. Flash-based viewerNext to each light field in the archive is a link that lets you view the light field, including flying around it and creating synthetically focused views from it, using a Flash-based viewer that runs in your browser. You shouldnt need todownload any software to use this viewer,