1 April 1996 Scanline algorithms in the JPEG discrete cosine transform compressed domain
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Scanline algorithms are popular in computer graphics for complex geometric manipulations. The main characteristic of scanline algorithms is that a geometric transformation is decomposed into multipass transforms with each pass operating only along row or column scanlines. This leads to conversion of 2-D image manipulation problems to straightforward 1-D problems resulting in simple and systematic methods. The goal of this work is to examine the scanline approach for manipulation of transform-compressed images without decompressing them. We show how the scanline algorithms for rotation and projective mapping can be developed for JPEG/DCT images. The performance of the proposed scanline algorithms is evaluated with respect to quality, speed, and control and memory overhead.
Bo Shen, Ishwar K. Sethi, "Scanline algorithms in the JPEG discrete cosine transform compressed domain," Journal of Electronic Imaging 5(2), (1 April 1996). https://doi.org/10.1117/12.238699 . Submission:

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