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A Steganographic Method for Data Hiding in Binary Image using Edge based Grids

This paper presents a new data hiding method for hiding data in a Binary Image using Edge based Grid. Unlike existing block based approaches for data hiding, this method makes use of the grid which is formed of edges along the objects present in input image. These grids are obtained by tracing the object contours from a valid contour starting location in anticlockwise direction. Once the grid is obtained we divide this grid into number of segments called Contour Segments. These Contour Segments are checked for Embeddabilty depending on the direction in which they are traced. If the Contour Segment matches the Lshaped Pattern then it is considered as Embeddable. Data bits are embedded into these embeddable Contour Segments. Experimental Result shows that the proposed method achieves good perceptional quality and payload for images with low resolution also. Use of interchangeable patterns ensures correct extraction of data without the help of original image.