Hiding data in images by simple LSB substitution

By Chi-Kwong Chan, Lee-Ming Cheng. Pattern Recognition, 2004

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Adaptive Data Hiding in Edge Areas of Images With Spatial LSB Domain Systems (2008, methodology): “In order to improve the quality of the stegoimages, we apply the well-known LSB substitution method, called the modified LSB substitution method [8], [11].”
A DWT Based Approach for Image Steganography (2006, methodology): “The design of a steganography system also can be categorized into spatial domain methods [11][12] and frequency domain ones [13][14][15].”
A high quality steganographic method with pixel-value differencing and modulus function (2008, methodology): “A novel simple LSB technique based on optimal pixel adjustment was presented to achieve the goal of improving the stego-image quality (Chan and Cheng, 2004). Besides, Thien and Lin also presented a simple LSB scheme based on the modulus function to improve the stego-image quality (Thien and Lin, 200”
Combined DWT-DCT Digital Image Watermarking (2007, background): “Compared to spatial domain techniques [5] , frequency-domain watermarking techniques proved to be more effective with respect to achieving the imperceptibility and robustness requirements of digital watermarking algorithms [6] .”