Optimum Discrimination Using High Gamma Aerial Color Photography by Exposure Control,
Abstract
An important application of aerial photography in remote sensing is the detection and discrimination of small changes in the spectral quality of objects or regions of interest from the spectral quality of the normal background. In particular, diseased areas of agricultural crops and forests, small stands of different species in forests, and water pollution all tend to exhibit small spectral variations indicative of the presence of important objects or conditions of interest. However, normally exposed, high gamma color photography frequently fails to record these conditions in an optimum fashion. In the following paragraphs, a systematic method of optimizing the discrimination by aerial photography is developed. Simple and cogent rules of thumb are derived for exposure control of high gamma color aerial photography for optimizing the discrimination of certain classes of background materials from target areas whose spectral properties are very close to those of the background. The logic for deriving the optimization procedure by exposure control makes use of the concepts of exposure magnitude and direction of color film. These two new concepts are described below. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 21, 1976
- Accession Number
- ADA027219
Entities
People
- G. Suits
Organizations
- Environmental Research Institute of Michigan