Published Paper Details:

In this paper we propose an image resolution enhancement technique which generates sharper high resolution images. The proposed technique uses Discrete Wave Transform(DWT) to decompose a low resolution image into three high frequency sub-bands. Then these sub-band images have been interpolated with the help of bi-cubic interpolation. The high frequency sub-bands obtained by SWT of the input image are converted into the interpolated high frequency sub-bands. This helps in correcting the estimated coefficients. In addition the input image is also interpolated separately. Finally, corrected interpolated high frequency sub-bands and interpolated input image are combined by using a method called inverse DWT (IDWT) to achieve a high resolution output image. To achieve sharper images, we propose to use an intermediate stage to estimate the high frequency sub bands by utilizing the difference image obtained by subtracting the input image and its interpolated LL sub band.