Water Area Extraction from RGB Aerophotograph Based on Chromatic and Textural Analysis

摘要

When triangulating RGB aerophotograph, if automatically and randomly selected matching pass points unfortunately locates into water areas, these points, limited by their inaccuracy, will decrease the precision of triangulation. Therefore, extraction of water area beforehand is conducive to eliminate water falling pass points and guarantee the quality of aerotriangulation. A new methodology to extract water area from RGB aerophotograph is put forth in this paper. Procedure initiates by segmenting the whole aerophotograph into homogenous and united segments. Subsequently, compute chromatic and textural features of every segment and compare each segment's features to sampled water segments' features. Finally extract those segments whose chromatic and textural features are similar to sampled segments' as water areas. This methodology has a relatively obvious merit in effectiveness and generality.