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Contextual encoding in uniform and adaptive mesh-based lossless compression of mr images.
| Content Provider | CiteSeerX |
|---|---|
| Author | Ramakrishnan, A. G. Srikanth, R. |
| Abstract | Abstract—We propose and evaluate a number of novel improvements to the mesh-based coding scheme for 3-D brain magnetic resonance images. This includes: 1) elimination of the clinically irrelevant background leading to meshing of only the brain part of the image; 2) content-based (adaptive) mesh generation using spatial edges and optical flow between two consecutive slices; 3) a simple solution for the aperture problem at the edges, where an accurate estimation of motion vectors is not possible; and 4) contextbased entropy coding of the residues after motion compensation using affine transformations. We address only lossless coding of the images, and compare the performance of uniform and adaptive mesh-based schemes. The bit rates achieved (about 2 bits per voxel) by these schemes are comparable to those of the state-of-the-art three-dimensional (3-D) wavelet-based schemes. The mesh-based schemes have been shown to be effective for the compression of 3-D brain computed tomography data also. Adaptive mesh-based schemes perform marginally better than the uniform mesh-based methods, at the expense of increased complexity. Index Terms—3-D coding, content-based mesh, context-based modeling, medical image coding, volumetric image compression. I. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Wavelet-based Scheme Simple Solution 3-d Brain Magnetic Resonance Image Consecutive Slice Bit Rate Increased Complexity Affine Transformation Aperture Problem Tomography Data Content-based Mesh Mesh Generation Motion Compensation Motion Vector Clinically Irrelevant Background Contextual Encoding Mesh-based Scheme Accurate Estimation 3-d Brain Brain Part Spatial Edge Uniform Mesh-based Method Index Term Optical Flow Medical Image Coding Entropy Coding Adaptive Mesh-based Scheme Mr Image Context-based Modeling Adaptive Mesh-based Lossless Compression Lossless Coding Novel Improvement Volumetric Image Compression Mesh-based Coding Scheme |
| Content Type | Text |
