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Secret data delivery is a most important activity in the modern life. Steganography technique uses a cover medium to carry secret data and deliver it to right receivers over public computer networks. Because a stego medium is easier to cheat an unexpected user's observation, Steganography technique is more suitable for delivering secret data. Histogram adjustment is a good way for concealing secret data into a cover image with small distortion. Luo et al. use the pixel interpolation technique and histogram shifting to conceal secret data into a grayscale image. Visual quality and embedding capacity are two most important factors for designing a data hiding technique. The performance of Luo et al.'s method in terms of embedding capacity can be further improved.
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