Abstract: In a digital image watermarking system, information carrying watermark is embedded in an image. The most important requirement of watermarking system is the quality of watermarked image. In most applications, the watermarking algorithm must embed the watermark such that this does not affect the quality of the underlying host data. Although many watermarking techniques have been proposed by various researchers, the specific requirements of each watermarking technique vary with the used application. One of the most famous techniques inserts the watermark in the underused Least Significant Bits of the image (LSB). The aim of this study is to improve LSB technique to give better image quality of watermarked images by moving the watermarked pixel to be very close to the original pixel. So in case the hidden bit is not the same as the original bit, the best watermarked image quality will be obtained by moving the pixel to be located in the edge of ranges towards the original pixel.
Akram M. Zeki , Azizah A. Manaf and Sayuthi Jaafar , 2007. Quality Improvement of Digital Watermarking Images . Asian Journal of Information Technology, 6: 607-613.