Image Compression Experiment on Raw Grayscale Image Lena_gray.bmp Using 8×8 DCT Transform

This experiment performs image compression on the raw grayscale image Lena_gray.bmp by applying 8×8 DCT transformation. We compare results after keeping only the DC coefficient, and retaining the first 4, 8, and 16 transform coefficients (DC+AC) followed by IDCT reconstruction. Implementation can be achieved using MATLAB's Image Processing Toolbox functions with appropriate block processing and coefficient thresholding techniques.