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 47
- Downloads 0
Automatic Non-native Dialect and Accent Voice Detection of South Indian English
Speech recognition has achieved enormous improvements presently. However, robustness is still one of the big tribulations, e.g. performance of recognition fluctuates penetratingly depending on the speaker, particularly a...
A Novel Approach to Fish Disease Diagnostic System based on Machine Learning
Real-Time identification automated system diagnoses fish disease i.e. Epizootic Ulcerative syndrome (EUS) which is caused by Aphanomyces invadans, a fungal pathogen. In this paper we propose a Real- Time fish disease dia...
Gait Recognition System Using Gabor Wavelet and Active Gait Differential Image
Gait is a behavioural biometric process that serves to identify persons using their walking style. It is un-obstructive, not easy to conceal and offers distance recognition. Various approaches have been employed to impro...
Stroke Prognosis through Retinal Image Analysis
Many eye diseases as well as systemic diseases usually used to manifest in the retina. The innovations in the field of retinal imaging have paved the way to the development of tools for assisting physicians in stroke pro...
Approach to Detecting Forest Fire by Image Processing Captured from IP Cameras
In this paper, the results show an algorithm to detect the presence of smoke and flame using image sequences captured by Internet Protocol (IP) cameras is represented. The important characteristics of smoke such as color...