An algorithm embedding bit series in image spatial domain

An algorithm embedding bit series in the image spatial domain is studied. The algorithm determines the embedding strength using characteristics of the human visual system, so the resulting image quality is guaranteed. The algorithm utilizes the fact that natural image data is locally correlated, and uses a precede method to reduce the original image´s energy, and at the same preserves the watermark information. The algorithm is discussed in detail in theory, and experimental results show consistency with theory.