Increasing image compression rate using steganography
Two new image compression algorithms based on DCT-JPEG and DWT-JPEG, called Stego-JPEG (DCT) and Stego-JPEG (DWT), are investigated. The key idea is to compress a block of an image using lossy JPEG, and then hide the resulting bits into subsequent blocks. Increasing compression ratio is improved with high quality for both Stego-JPEG (DCT) and Stego-JPEG (DWT). For color images, Stego-JPEG (DCT) and Stego-JPEG (DWT) have more compression ratio than grayscale also decrease of PSNR is better than grayscale.
steganography dct jpeg dwt