title: A compressed domain scheme for classifying block edge patterns.
abstract: Detecting and classifying edge components in images find a wide range of applications from perceptually improved coding schemes to content-based searches. In this paper, a fast and systematic scheme is proposed to classify the edge orientation of each block in discrete cosine transform (DCT)-compressed images. Derived from a simple, but acceptable, pixel-domain algorithm, the proposed scheme performs directly on DCT coefficient domain and, thus, saves the arithmetic operations by a considerable amount. The performance of the proposed method is validated by the experiments against various natural images.
authors.affiliation: Electronics and Telecommunications Research Institute, Daejeon 305-350, Korea. hschang@ieee.org
authors.forename: Hyun Sung
authors.initials: HS
authors.lastname: Chang
authors.forename: Kyeongok
authors.initials: K
authors.lastname: Kang
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D044962:Data Compression / Q000379:methods*; D005240:Feasibility Studies; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013382:Subtraction Technique