Grid Based Image Scaling Technique

The growing interest in image scaling is mainly due to the availability of digital imaging devices such as, digital video cameras, digital camcorders, 3G mobile handsets, high definition monitors etc. Scaling a digital image is a demanding and very important area of research. The grid based image scaling technique is proposed, where grid size equals the new desired dimensions of digital image. Virtually the grid is placed on the image and the intensity value of each pixel of grid is computed by taking weighted average of all intensities which are part of the imaginary pixel. The proposed grid based scaling algorithm outperforms other standard and widely used scaling techniques like linear interpolation, B-spline with order 2, B-spline with order 3. The algorithm is capable of scaling both grey-scale and color images of any resolution in any scaling factor. MSE and PSNR comparisons for down-after-up image scaling proves that the proposed technique gives better quality scaled images over other methods.