دورية أكاديمية
Comparison of Effects of Entropy Coding Schemes Cascaded with Set Partitioning in Hierarchical Trees
| العنوان: | Comparison of Effects of Entropy Coding Schemes Cascaded with Set Partitioning in Hierarchical Trees |
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| المؤلفون: | Ali Iqbal, Imran Touqir, Asim Ashfaque, Natasha Khan, Fahim Ashraf |
| المصدر: | Mehran University Research Journal of Engineering and Technology, Vol 37, Iss 4, Pp 507-520 (2018) |
| بيانات النشر: | Mehran University of Engineering and Technology, 2018. |
| سنة النشر: | 2018 |
| المجموعة: | LCC:Technology LCC:Engineering (General). Civil engineering (General) LCC:Science |
| مصطلحات موضوعية: | Technology, Engineering (General). Civil engineering (General), TA1-2040, Science |
| الوصف: | WT (Wavelet Transform) is considered as landmark for image compression because it represents a signal in terms of functions which are localized both in frequency and time domain. Wavelet sub-band coding exploits the self-similarity of pixels in images and arranges resulting coefficients in different sub-bands. A much simpler and fully embedded codec algorithm SPIHT (Set Partitioning in Hierarchical Trees) is widely used for the compression of wavelet transformed images. It encodes the transformed coefficients depending upon their significance comparative to the given threshold. Statistical analysis reveals that the output bit-stream of SPIHT comprises of long trail of zeroes that can be further compressed, therefore SPIHT is not advocated to be used as sole mean of compression. In this paper, wavelet transformed images have been initially compressed by using SPIHT technique and to attain more compression, the output bit streams of SPIHT are then fed to entropy encoders; Huffman and Arithmetic encoders, for further de-correlation. The comparison of two concatenations has been carried out by evaluating few factors like Bit Saving Capability, PSNR (Peak Signal to Noise Ratio), Compression Ratio and Elapsed Time. The experimental results of these cascading demonstrate that SPIHT combined with Arithmetic coding yields better compression ratio as compared to SPIHT cascaded with Huffman coding. Whereas, SPIHT once combined with Huffman coding is proved to be comparatively efficient. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0254-7821 2413-7219 |
| العلاقة: | http://publications.muet.edu.pk/index.php/muetrj/article/view/559Test; https://doaj.org/toc/0254-7821Test; https://doaj.org/toc/2413-7219Test |
| DOI: | 10.22581/muet1982.1804.06 |
| الوصول الحر: | https://doaj.org/article/6cad60685bf047689f1e9ea400a41e2cTest |
| رقم الانضمام: | edsdoj.6cad60685bf047689f1e9ea400a41e2c |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 02547821 24137219 |
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| DOI: | 10.22581/muet1982.1804.06 |