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.