Image Watermarking Using Spatial Domain Technique To make it more Robust and Cropping

Piracy in the presence of internet and computers proves to be a biggest jolt to the concerned industry. To reduce the piracy and duplicity of the images, digital watermarking technique is having an edge over the other available techniques. The aim of this project is to simulate the Image Watermarking using MATLAB. The simulation is done in Spatial Domain, techniques used are "Threshold Based Correlation", "Comparison Based Correlation", "Least Significant Bit Substitution". Threshold Based Correlation is more robust as 'k' increases. In Least Significant Bit Substitution method cropping is possible. The main advantage of such a technique is that the modification of the LSB plane does not affect the human perception of the overall image quality as the amplitude variation of the pixel values. Comparison Based Correlation increases the probability of a correct detection, even after the image has been subject to attack. It can improve the method by pre-filtering the image before applying the watermark. It is possible to reduce the correlation between the cover image and the PN sequence, can increase the immunity of the watermark to additional noise.