To avoid poor appearance of lossless visible watermarks due to gray level flipping existence in some previous work

we propose two embedding methods capable of completely reconstructing the host image with satisfactory visual quality. The first calculates exclusive OR between the image’s MSB plane and the binary watermark. The other method uses a bit shift strategy to push down high bits of the mark covered pixels

and replaces the MSB with the mark data

making the watermark semi transparent and other image areas completely transparent. The watermark can be embedded into any position of the carrier image with any size. Both methods can losslessly reconstruct the host image without knowing the watermark information.