Large-screen seamless splicing technology is a special and relatively demanding projection display application, which can realize the fusion of multi-screen images and minimize the splicing gap so that it completely overlaps. Seamless stitching technology not only requires a complete super-large screen, but also has special requirements for the projection used to project super-large screens. The development of seamless splicing technology has experienced three stages of pure hardware fusion technology, pure software fusion technology and software and hardware fusion technology.
Pure hardware fusion technology is to merge images through optical shading processing, pure software fusion technology is to complete image fusion through electronic circuit processing, and software and hardware fusion technology refers to both optical shading fusion processing and electronic fusion processing. Because hardware fusion can better deal with the black balance of the fused image, and software fusion can better deal with the white balance of the image, the combination of the software and hardware fusion technology of the two can more perfectly achieve the true reproduction of the fused partial color image.
In terms of splicing effect, seamless splicing technology has also experienced three development stages: hard-edge splicing, overlapping splicing and soft-edge fusion splicing.
The hard-edge stitching has obvious dividing lines (ie, physical stitching), which cannot achieve the integrated display of the panorama; overlapping stitching refers to overlapping the images projected by the two projectors in a superimposed manner at the stitching point, but this stitching obviously exists The ills of over-bright areas appearing at the stitching area due to superimposed brightness affect the realization of seamless effect.
Soft edge fusion splicing through the processing of edge fusion technology not only realizes the complete fusion of the two sides, but also eliminates the over-bright areas caused by overlapping splicing, and the soft edge fusion splicing can adapt to the splicing of various curved shapes such as planes, cylinders, spheres, etc. , With wider applicability. Whether the soft-edge fusion splicing technology is the current mainstream technology is also the future development direction.
The soft-edge fusion splicing system is a complex system project. Usually, the following equipment is required to build a complete soft-edge fusion splicing system:
1. Screen: The screen gives the audience the most intuitive visual impact. Screen selection is crucial. First of all, ensure that the entire screen is seamless to ensure the perfect display of the picture.
2. Projector: The picture quality of the projector directly affects the display effect of the large screen, which is also very important. Use 3-DMD technology as much as possible to ensure good color reproduction. High-end 3-LCD projectors can also be used, but it takes a lot of time to adjust color consistency.
3. Soft-edge fusion splicing processor: The soft-edge fusion splicing processor mainly determines the content and speed of the large-screen display, the quality of the processor, the processing speed of the signal source, the clarity of the picture, and the quality of the soft-edge fusion. Have an important role.
4. Signal processing equipment: Signal processing equipment includes signal source type conversion, signal switching, signal amplification and transmission, etc., which is very important for the display of large screen images.
5. Centralized control equipment: There are many types of equipment in the large-screen splicing system, the number of projectors, the number of matrices, and the number of signal sources are relatively large. The central centralized control equipment can help quickly process signal selection and switching, and facilitate the control of equipment. The operation process quickly improves work efficiency and accuracy.
6. Peripheral equipment: Peripheral equipment includes signal source desktop access system, cables, connectors, cabinets, power supply, etc.
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