Abstract
To acheive both high compression ratio and information preserving, it is an efficiet way to combine segmentation and lossy compression scheme. Microcalcification in mammogram is one of the most significant sign of early stage of breast cancer. Therefore in coding, detection and segmentation of microcalcification enable us to preserve it well by allocating more bits to it than to other regions. Segmentation of microcalcification is performed both in spatial domain and in wavelet transform domain. Peak error controllable quantization step, which is off-line designed, is suitable for medical image compression. For region-adaptive quantization, block-based wavelet transform coding is adopted and different peak-error-constrained quantizers are applied to blocks according to the segmentation result. In view of perservation of microcalcification, the proposed coding scheme shows better performance than JPEG.
Original language | English |
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Pages (from-to) | 556-562 |
Number of pages | 7 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 3335 |
DOIs | |
State | Published - 1998 |
Event | Medical Imaging 1998: Image Display - San Diego, CA, United States Duration: 22 Feb 1998 → 24 Feb 1998 |
Keywords
- Arithmetic coding
- Block-based wavelet transform conding
- Peak error controllable quantization