title: Locating edges and removing ringing artifacts in JPEG images by frequency-domain analysis.
abstract: We present a method of locating edges in JPEG-coded images which operates in frequency space on the DCT coefficients. Applied to the quantized DCT coefficients of a block containing a straight edge, the method yields an equation for the edge in a fraction of the operations needed to dequantize and transform the coefficents to pixel values. As a sample application of this method, we present a technique for alleviating ringing artifacts in JPEG-coded images.
authors.forename: Irina
authors.initials: I
authors.lastname: Popovici
authors.forename: W Douglas
authors.initials: WD
authors.lastname: Withers
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003196:Computer Graphics; D044962:Data Compression / Q000379:methods*; D005583:Fourier Analysis; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D010363:Pattern Recognition, Automated / Q000379:methods*; D012815:Signal Processing, Computer-Assisted