Research Of Core Algorithm And Framework In The CAD System Of Large Weaving Color Digital Jacquard

Relying on computer image processing, color digital jacquard technology is aimed togenerate the pattern file of jacquard from image input. The main technical difficulty of thistechnology is how to achieve automatic color selection process, raise the color gradationsand reduce color distortion with the increasing number of jacquard needles. Traditionalcolorful jacquard CAD software can not satisfy the requirements of large weaving colordigital jacquard, for the scale of scanned image is relatively small, and the size of theinput image and the output pattern is not large enough.In order to promote the application of computer aided technology in jacquardtechnology, this thesis conducts research on theory, technology and algorithms of colorschemes in large weaving color digital jacquard, aiming to develop self-owned intellectualproperty of large weaving color digital jacquard CAD system. The research results in thisthesis can be summed up as follows:I. A new method for designing and generating dynamic layered color schemes isproposed, which is suitable for large weaving color digital jacquard. Applying a uniquesecondary color scheme, the method can carry out dynamic combination according todifferent needs. Compared with present methods, the new color scheme designed in thisthesis has such advantages as:() the method not only can be used by the producers andmanufacturers of color jacquard enterprises, but also can be widely used for technologicalreform and upgrading of existing monochrome jacquard;() this method can providedifferent dynamic combination of color scheme according to different types of jacquardmachine. It makes jacquard design and weaving of colorful images can be completed whenonly using4to8colorful yarns;() adopting this method to match and select colors for color jacquard, there are more than256gradations of colors, which makes it more colorfuland improves the color saturation of products greatly.II. Based on the research and analysis of jacquard image preprocessing algorithms, anovel image scaling method is proposed. The result shows that the method in the thesis,compared with traditional interpolation methods, not only maintains the image texturefeatures and details but also makes the calculation results with better visual correlation,which improves the quality of interpolation images effectively in both subjective visualevaluation and the objective numerical comparison.III. The core architecture of CAD System of large weaving color digital jacquard isestablished. Adopting the software engineering design method to modularize the systemfunction, it realized the framework of CAD design system for large weaving color digitaljacquard with the color schema of large weaving color digital jacquard as its core.