Color Image Watermarking Algorithm Based on Discrete Cosine Transformation
Jing Xu · Ordnance Industry Automation · 2006
According to the embedded trait of watermarking into low,middle and high frequency coefficients of discrete cosine transformation,an embedded algorithm was proposed based on DCT middle frequency of green heft.The watermark image was firstly encrypted through Arnold scrambling technique,and embedded into DCT middle frequency coefficients of host image green channel;then gained the green heft through channel separation of originality image.Received embedded watermarking information image block through DCT transformation,and merged it into the whole plan through DCT inverse transformation;then,received watermarking information gray image of green heft.Finally the watermarking color image was received through channel compound.It solved the watermarking algorithms contradictions of imperceptible and robustness.