Qiu Yingqiang. Large capacity lossless information hiding in images using integer transform[J]. Journal of Image and Graphics, 2014, 19(1): 28-35. DOI: 10.11834/jig.20140104.
According to the problem of embedding capacity and visual quality
a lossless information hiding method based on reversible integer transform algorithm with larger embedding capacity for image is proposed. By the proposed reversible integer transform algorithm
the average value of an image block with n pixels is calculated first
and the difference between every pixel's value with the mean value is expended 4 times as large as before during the integer transform. The two least significant bits of all the transformed pixels' values are equal
producing redundancy information which can be used to embed 2(-1)bits data. Based on the proposed new reversible integer transform algorithm
an information hiding method with larger embedding capacity for image was presented
the experimental results showed that the proposed method has lager embedding capacity and better security
and both the original host image and the embedded data could be restored without any distortion from the marked image.