A Note on Two-Level Display of Aerial Photographs.
Abstract
A two-level display of the digitized aerial photographs represents the maximum compression of image data that can possible be made. Although a large amount of information is lost in the binary quantization process to generate a two-level picture, such picture still provides useful and essential information, when the threshold is properly selected, for human visualization and for further processing in computer such as feature extraction and image recognition. The binary quantization requires least amount of computation time and can thus be considered as a basic step in image preprocessing. The computer can best be operated in the time-shared mode for the display purpose. In this note the selection of threshold from the gray level histograms is examined in detail. The XY plotter display of several photographs at different thresholds is provided. The effect of threshold selection on locating the target and determining the size and shape of the target is also discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 20, 1975
- Accession Number
- ADA006228
Entities
Organizations
- University of Massachusetts Dartmouth