Comparison of Image Fusion Technique by Various Transform based Methods

Abstract

The transform based methods are common in pixel level image fusion technique. Image fusion technique is the process to fuse two images and aims to obtain more information in one image by using appropriate fusion ruleswith pixel by pixel basis. Image fusion technique is to combine the information of a variety of images with computer based image processing method.The determination of image fusion technique is to afford information combined from different images, to eliminate redundancy and inconsistency existed between the images. This technique is used to improve the interpretation, accuracy, reliability and utilization of the information with the enhancement of transparency of image information by forming a clear and accurate description of observed target. The various transform based methods consists of discrete wavelet transform (DWT), discrete cosine transform (DCT) and Hybrid transforms (DWT with NSCT). The fused image of decomposed sub bands are obtained by applying inverse transforms. A transform based image fusion technique is employed in order to improve efficiency in an effective manner. By this method better PSNR (peak signal to noise ratio) value with less MSE (mean square error) can be obtained. Index terms-Image fusion, discrete wavelet transform (DWT), discrete cosine transform (DCT),hybrid transforms, non-sub-sampled contourlet transform (NSCT), Peak signal to noise ratio (PSNR), Mean square error (MSE).