Color image watermarking method based on local histogram characteristics
A color image, local feature technology, applied in image enhancement, image data processing, image data processing and other directions, can solve problems such as poor stability of feature points, inability to achieve blind detection of watermark information, and small capacity of digital watermarks.
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[0077] Embodiment of the present invention carries out as follows:
[0078] a. Using the color characteristics and geometric structure characteristics of color images, establish a color invariant model for color images:
[0079] In order to improve the robustness and imperceptibility of digital watermarking, the present invention first combines the Kubelka-Munk theory and utilizes the color characteristics and geometric structure characteristics of color images to construct a color invariant model:
[0080] The Kubelka-Munk theory describes the spectral radiation characteristics of objects, and its model is:
[0081] (1)
[0082] in, represents the wavelength, Indicates the observation position, represents the spectral intensity, express The Fresnel reflection coefficient at , Indicates the reflectivity, represents the reflection spectrum at the observation site,
[0083] is the color invariant:
[0084] (2)
[0085] ...
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