High-fidelity hidden image figure screen frequency determination method and system based on direct correction

Abstract

The invention provides a high-fidelity hidden image figure screen frequency determination method and system based on direct correction, and relates to the technical field of anti-counterfeiting printing. The method includes the steps that after a bottom image is hidden in a surface image at a conventional screen frequency, image defects caused in the image hiding and printing processes are quantitatively and accurately predicted through a printed image distortion prediction system, accurate alignment compensation is carried out through an image compensation optimization system, and a high-fidelity printed product including the bottom image is obtained. The system comprises a color separation module, a screen frequency determination module, a screen point modulation module, a printed image distortion prediction module, an image distortion compensation optimization module, an optimization result judgment module and a platemaking printing module. By means of the high-fidelity hidden image figure screen frequency determination method and system based on direct correction, the multilayer high-definition and multi-gray level bottom image is hidden under the condition that the high fidelity of the surface image is guaranteed, the quality of the surface image can be effectively improved, the selection range can be widened, the bottom image is large in modulation amplitude, good in visual effect and high in resolution ratio, and the high-fidelity hidden image figure screen frequency determination method and system based on direct correction are suitable for various screen point modulation modes and a combination thereof.

Description

Technical field: [0001] The invention relates to the technical field of anti-counterfeiting printing, in particular to a method and system for digital hanging of high-fidelity Tibetan pictures based on direct correction. Background technique: [0002] The technique of hiding other images or information within printed diagrams has a long history. With the digital development of printing, more and more technical methods for hiding images or information have been developed and applied, the most widely used in the field of anti-counterfeiting. [0003] The actual displayed image that the observer can see is called the surface image; the image that is hidden under the surface image through a specific technology, cannot be distinguished by the naked eye, and can only be seen through corresponding detection means is called the base image; the base image The process hidden under the table map is called the hidden map. [0004] Most conventional printing systems do not have the abi...

AI Technical Summary

Problems solved by technology

The second type of defect cannot be directly identified in the halftone image. It is caused by the interaction between the distortion of the printing system and the disturbance of the dot structure. Different printing systems have different results.

Therefore, the application range of this technology is greatly limited

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