Alteration-Locating Authentication Watermarking for Binary Images

Erasable Authentication Watermarking in Binary Document Images

“…The performance of the proposed algorithm can be compared with the previous method [2]. The localization accuracy in the proposed method has been improved to the block-size of 40×40 pixels.…”

“…For such images, hiding sufficient amount of data for secure authentication without creating visible distortion is difficult. The previous method for localization in binary document images has been reported in [2]. In this method, the original image is divided into many sub-images and each sub-image is watermarked independently.…”

Data Hiding for Binary Documents Robust to Print-Scan, Photocopy and Geometric Distortions

“…Block-wise: Divide the cover image into blocks and modify some characteristic of each block to hide the data. Some papers suggest changing the parity or the quantization step of the number of black pixels in each block [7,8]. Others suggest flipping one specific pixel in the block with m pixels to insert ⎣ ⎦ ) 1 ( log 2 + m bits [9,10].…”

Binary document image watermarking for secure authentication using perceptual modeling

“…The challenging problem is how to divide the binary image into two parts such that the above idea of embedding the authentication signature can be applied. Cryptography-based authentication watermarking schemes were proposed for binary images in [12,13]. Kim et al modified few bits in a binary image for embedding the authentication signature and the positions of those bits were known in both embedding and detection processes [12].…”

“…However this method of simple partitioning the binary image results in poor visual quality. In [13], Kim et al shuffled the binary image and then partitioned the shuffled image into two equal parts. Authentication signature was computed from one part and then embedded into the other part using the block-wise data hiding technique developed in [7].…”