A digital image processing system has been developed to count and size laser-generated small particle images. Processing rates of 5 to 600 frames per minute were achieved by utilizing a real-time digital image processor. Particles from 7 to 700 mu m in the plane of focus were counted and sized. Emphasis was to determine the problems and limitations involved with using a digital image processing scheme to accurately size particles. Areas investigated include the effect of the threshold level on measured particle size, particle boundary diffraction gray-level gradients, and geometric nonlinearities introduced by the vidicon camera. A calibration reticle containing simulated particles from 5. 29 to 92. 75 mu m in diam was used for an in-depth calibration process.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Nov 1985|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics