A new and efficient steganographic method for concealing a piece of critical information into a gray-valued streak image is proposed. The secret message bits are embedded into Least-Significant-Bit (LSB) of erroneous pixel. The erroneous pixels are first detected using a Signal Dependent-Rank Ordered Mean (SD-ROM) technique. A 32-bit binary matrix and a Threshold value were used to protect the hidden information. The number of bits which can be embedded is decided by the erroneous pixels. This

more »

... ethod provides an easy way to produce a more imperceptible result than those yielded by simple Least-Significant-Bit replacement methods. The embedded secret message can be extracted from the resulting stego-image without referencing the original cover image. Adjusting threshold values in SD-ROM method to embed more information and reduce the MSE and increase the PSNR values is evident from the Experimental results.