What is image compression?
Compression is the removal of
redundant data. Image compression reduces number of bytes necessary to
represent an image, while keeping the visual quality of an image to a desired
Why is it necessary?
Image requires large amount of disk space for storage and bandwidth
for transmission. An image of 512x512 pixels with 1 byte of information per
pixel results in 0.25 MB file. If several such images are stored, we will soon
see that the hard disk is full. Therefore, compression is essential for
efficient archiving. Also, to transfer huge size images via internet, we would
like to use compression in order to minimize the number of bytes to transfer
and make the transfer time shorter. Image compression is a widely used technique that reduces the
storage space associated with the large image files, while preserving the image
SIPL and image compression
Signal and Image Processing Lab is devoted to theoretical
issues and practical applications of image compression. Its research team
focuses on state of the art compression techniques for different applications.
Wavelet based image compression methods are actively pursued by graduate
students of SIPL.