Comparison of LSB methods and pattern

During the most recent couple of decades there have been a colossal advancement in digital image steganography. This paper reviews the method of steganography based on Least Significant Bit Substitution of digital image and analyzed pattern of LSB substitution which hides the message in the form of bits. The pattern of LSB are categorized into Bitwise and Blockwise and then again classified further into linear and nonlinear. Linear methods follow definite pattern and nonlinear methods are dynamic in nature which selects the pixel randomly for embedding. The paper also compares the PSNR and hiding capacity of methods.