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David Grier's Home PageDepartment of Physics and
Center for Soft Matter Research
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Particle Tracking Routines |
| Program | Purpose |
| bpass.pro | Implements a real-space bandpass filter which suppress pixel noise and long-wavelength image variations while retaining information of a characteristic size. |
| fastfeature.pro | Find the centroids of disk-like features in an image quickly. |
| feature.pro | Finds and measures roughly circular 'features' within an image. |
| featuretool.pro | Graphical interface for setting parameters for FEATURE. |
| tracking.tgz | Gzipped tar archive |
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Holography Optical Trapping Routines |
| Program | Purpose |
| holo_init.pro | Set up the HOLO_COMMON common block for HOT applications. |
| fastphase.pro | Calculates the phase hologram encoding a desired trapping pattern by superposing fields as fast as possible. |
| dsphase.pro | Calculates the phase hologram encoding a desired optical intensity pattern using superposition followed by direct search refinement. |
| vortex.pro | Returns a phase hologram encoding a helical mode. |
| maketheta.pro | Creates an array whose values are the angles in radians relative to the x-axis of each pixel in the array. |
| makerho.pro | Creates an array whose values are the distances from the center of each pixel in the array. |
| hot.tgz | Gzipped tar archive |
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Holographic Video Microscopy Routines |
| Program | Purpose |
| fitspheredhm.pro | Measure the radius, refractive index, and three-dimensional position of a colloidal sphere immersed in a dielectric medium by fitting its digital holographic microscopy (DHM) image to Mie scattering theory. |
| spheredhm.pro | Computes holographic microscopy image of a sphere immersed in a transparent medium. |
| spherefield.pro | Calculates the complex electric field scattered by a sphere illuminated by a plane wave linearly polarized in the x direction. |
| sphericalfield.pro | Calculates the complex electric field defined by an array of scattering coefficients. |
| sphere_coefficients.pro | Calculates the Mie scattering coefficients for a homogeneous isotropic sphere illuminated by a coherent plane wave linearly polarized in the x direction. |
| spheredhmprofile.pro | Calculates the radial profile of the in-line hologram of a sphere, as obtained with digital holographic microscopy. |
| spheretool.pro | Interactively find reasonable fitting parameters for digital holographic microscopy images of colloidal spheres. |
| hvm.tgz | Gzipped tar archive |
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Utility Routines |
| Program | Purpose |
| read_gdf.pro | Read in data files created by WRITE_GDF. |
| write_gdf.pro | Writes IDL-style data to disk in a format which can be easily read back in. |
| deinterlace.pro | Deinterlaces an (interlaced) image. |
| utility.tgz | Gzipped tar archive |
Contact Information
David G. Grier Department of Physics
Center for Soft Matter Research
(212) 998-3713 (voice) New York University
(212) 995-4016 (FAX) 4 Washington Place
david.grier@nyu.edu New York, NY 10003