Embedded Zero Tree – Algorithm for Image Coding

Embedded Zero Tree – Algorithm for Image Coding

In the present digital world, we manage and store different types of data like video,music,images, text files etc digitally in our computers which basically are digital systems. In the case of storing any media type we always look forward to minimum size and maximum quality. When we consider the case of storing an image, we always adopt a “compress and store” algorithm, in which the image is first compressed to reduce the space occupied by the image using compression algorithms and then the data is written into the memory for storage. There are already many algorithms available for image compression and storing and they are being used based on the application and importance of the data. Embedded Zero tree Wavelet (EZW) algorithm is an efficient compression algorithm which is comparatively a newcomer in the field of image coding.

INTRODUCTION

EZW algorithm is a lossy compression algorithm in which bits are generated in a bit stream, according to their importance. The EZW encoder calculates a best suited threshold value for compress the still image at a specific decomposition level, followed by multilevel decomposition steps using this threshold. Normally the threshold ranges from 6 to 60, for a decomposition level of 8

Fig: Example for a three level wavelet decomposed image

3D Technology

Introduction of 3D Television

Three-dimensional TV 3D Television is expected to be the next revolution in the TV history. They implemented a 3D TV prototype system with real-time acquisition transmission, & 3D display of dynamic scenes. They developed a distributed scalable architecture to manage the high computation & bandwidth demands. 3D display shows high-resolution stereoscopic colour images for multiple viewpoints without special glasses. This is first real time end-to-end 3D TV system with enough views & resolution to provide a truly immersive 3D experience.Japan plans to make this futuristic television a commercial reality by 2020as part of abroad national project that will bring together researchers from the government, technology companies and academia. The targeted "virtual reality" television would allow people to view high definitionimages in 3D from any angle, in addition to being able to touch and smell the objects being projected upwards from a screen to the floor.