Locating edges and removing ringing artifacts in JPEG images by frequency-domain analysis.
other · Level V
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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.
Medical subject headings
- Artifacts
- Computer Graphics
- Data Compression
- Image Enhancement
- Image Interpretation, Computer-Assisted
- Pattern Recognition, Automated
- Signal Processing, Computer-Assisted