Research the narrow image of watermark security problems.In view of the traditional three-dimensional grid anti-counterfeit watermarking algorithm for normal images taken effect is good

to reduce the image watermarking

anti-counterfeiting watermark invisibility and image of the disadvantages of aggression are weaker.Is suggested to consider an after shrinking anti-counterfeiting watermark algorithm of reduction characteristics.To reduce images

shrinking due to its image characteristics

needs to be 3dmodel transformation for 2-d numerical matrix

and USES the two-dimensional block discrete cosine transform;And then USES the particle swarm optimization algorithm find the optimal anti-counterfeiting watermark embedding positions

to embed the anticounterfeiting watermark best position

finally with anti-counterfeiting watermark is obtained by inverse transformation of three-dimensional network image.Simulation results show that the method of embedded anticounterfeiting watermark not only can resist a variety of different types of attacks

and has good invisibility

anticounterfeiting accuracy increased by 64% than the traditional algorithm

resistance to attack increased by 25%

for image copyright protection provides a strong support

in the work of digital image copyright protection with strong practical application value.