Title :
Locating Edges and Removing Ringing Artifacts in JPEG Images by Frequency-Domain Analysis
Author :
Popovici, Irina ; Withers, Wm Douglas
Author_Institution :
Dept. of Math., US Naval Acad., Annapolis, MD
fDate :
5/1/2007 12:00:00 AM
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
Keywords :
coding errors; data compression; discrete cosine transforms; edge detection; frequency-domain analysis; image coding; image resolution; JPEG-coded images; discrete cosine transform; edge location; frequency-domain analysis; quantized DCT coefficients; ringing artifact removal; Data mining; Discrete cosine transforms; Discrete transforms; Equations; Frequency domain analysis; Image coding; Image edge detection; Kernel; Mathematics; Pixel; Discrete cosine transform (DCT); JPEG; edge detection; step edge;
Journal_Title :
Image Processing, IEEE Transactions on
DOI :
10.1109/TIP.2007.891782
