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An Approach for Color Image Compression of JPEG and PNG Images Using DCT and DWT | IEEE Conference Publication | IEEE Xplore

An Approach for Color Image Compression of JPEG and PNG Images Using DCT and DWT


Abstract:

Now a days image compression has become is an indispensible part of digitized image storage and transmission. Compression of an image is necessary before storing and tran...Show More

Abstract:

Now a days image compression has become is an indispensible part of digitized image storage and transmission. Compression of an image is necessary before storing and transmitting it due to its limitation of storage and bandwidth capacity. Wavelet transform decomposes complexion of images into its elementary forms. In this paper, a comparative study has been carried out on image compression using DCT (Discrete Cosine Transform) and DWT (Discrete Wavelet Transform). A comparison is outlined to emphasize the results of this compression system between DCT and DWT using JPEG (Joint Photographic Experts Group) and PNG (Portable Network Graphics) color images. We have done conversion of color images into gray scale and also compression of gray scale image is shown after conversion using DWT method. DWT algorithm performs much better than DCT algorithms in terms of Compression, Mean Square Error (MSE) and Peak Signal to Noise Ratio (PNSR).
Date of Conference: 14-16 November 2014
Date Added to IEEE Xplore: 26 March 2015
ISBN Information:
Conference Location: Bhopal, India

I. Introduction

An image can be defined as a matrix of pixel or intensity values. Image compression is used to reduce the redundancy and randomness present in the image because to increase the storing capacity and efficiency level of the images. Therefore it is essential to compress the images by storing only the required information needed to reconstruct the image. To compress any image, redundancy must be removed. Sometimes images having large areas of same color will have large redundancies and similarly images that have frequent and large changes in color will be less redundant and harder to compress [1]–[3].

References

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