Design of DTCWT-DWT Image Compressor-Decompressor with Companding Algorithm
Journal Title: Advances in Image and Video Processing - Year 2017, Vol 5, Issue 1
Abstract
Discrete Wavelet Transform (DWT) has demonstrated advantages in image compression due to its time-frequency resolution property. Dual Tree Complex Wavelet Transform (DTCWT) in addition to the advantages of DWT supports additional properties such as directionality and shift invariant. DTCWT has coefficient redundancy of 4:1 or 2m:1 in m dimensions thus is four time complex than DWT computation. In this work, DTCWT based image compression algorithm is proposed that performs decomposition using DTCWT and reconstruction is carried out using DWT. The DTCWT bands are companded and encoded using entropy encoder and the quantization of the sub bands introduces minimum loss. The proposed algorithm achieves 77% compression with 40 dB PSNR thus suitable for real time image compression. DTCWT filters are appropriately selected to achieve perfect reconstruction.
Authors and Affiliations
Venkateshappa . , Cyril Prasanna Raj P
Keywords
Related Articles
- EP ID EP303235
- DOI 10.14738/aivp.51.2777
- Views 48
- Downloads 0
Semantic Enriched Lecture Video Retrieval System Using Feature Mixture and Hybrid Classification
The advancement in the web technologies has increased the lecture video contents tremendously. The lecture video retrieval for the e-learning process is a challenging task since the videos are unstructured and have a lar...
A Structural Analysis on the Creativity, Self-Leadership, Self-Determination, Career Decision-Making Self-Efficacy, and Career Preparation Behavior of College Students who participated in the Training Courses from Lifelong Educators
We conducted a structural analysis on the creativity, self-leadership, self-determination, career decision-making self-efficacy, and career preparation behavior of college students who participated in the training course...
Design of DTCWT-DWT Image Compressor-Decompressor with Companding Algorithm
Discrete Wavelet Transform (DWT) has demonstrated advantages in image compression due to its time-frequency resolution property. Dual Tree Complex Wavelet Transform (DTCWT) in addition to the advantages of DWT supports a...
MR Image Segmentation Based on Contrast Enhancement with Collaborative Learning
Magnetic resonance imaging (MRI) has been widely used on clinical applications. Due to different weighting strategies MRI, different weighting images have different contrast even for the same anatomy structure of the sam...
Local Intensity Ordering based Binary Patterns for Image Region Description
Local image region description is a fundamental task for image feature matching in the field of Computer Vision. A good image region descriptor should have the ability to discriminate image features even though the image...