Analysis of application of arithmetic coding on dct and dct-dwt hybrid transforms of images for compression
- Resource Type
- Conference
- Authors
- Koya, Thafseela; Chandran, Saravanan; Vijayalakshmi, K.
- Source
- 2017 International Conference on Networks & Advances in Computational Technologies (NetACT) Networks & Advances in Computational Technologies (NetACT), 2017 International Conference on. :288-293 Jul, 2017
- Subject
- Communication, Networking and Broadcast Technologies
Computing and Processing
Engineering Profession
Signal Processing and Analysis
Image coding
Discrete cosine transforms
Image color analysis
Color
Decoding
Gray-scale
DCT
DWT
Image Compression
Arithmetic Coding
- Language
The main aim of image compression is to represent the image at minimum amount of bytes. This paper presents a new algorithm that reduces number of bytes required to represent images. The proposed system divides the color image into RGB components, CMY components, YCbCr components separately and DCT and DWT are applied to each component and arithmetic coding is applied to the resultant and then their compression ratios are calculated. The results of DCT based arithmetic encoder and DCT-DWT hybrid arithmetic encoder is compared. It is observed that DCT-DWT hybrid arithmetic encoder approach outperforms DCT-based arithmetic encoder approach. It is also observed that the performance of the DCT-DWT hybrid arithmetic encoder based image compression system is best when the YCbCr components are evaluated. RGB and CMY component based compression provides similar results. This approach is also compared with Colour image compression algorithm based on the DCT transform using difference lookup table.