(3) Algorithm gradient sometimes makes the ridge appear in the gradient magnitude image. The edge point is defined as a maximum point of local intensity in the gradient direction. (2) Calculate local gradient and direction angle in each point. The specific method is summarized as follows: (1) Use a standard deviation of Gaussian filter to filter the image in order to reduce noise. Figure 1 shows human figures, animals and scene patterns in several common Li brocade designs.Ĭanny operator don't use gradient algorithm to search the edge points, but first do filtering smooth to graphics, and then take a kind of “non-maxima suppression” technology to process image. Common scene designs have a wedding, hunting, farming, sacrifice and harvest celebration, etc. Li brocade pattern characteristics are different under different branches of dialects: people in Ha and Qi dialects are given priority to with female image, constituted with a pair frog variant Plant pattern was used more in Ha dialects, of which trees and flowers, birds and animals, cattle and sheep are common Besides Human figure used in Qi dialect, animal pattern also often used, mainly fish, frogs, birds and animals, cattle and sheep, cats and dogs and other graphics, and geometric patterns used fewer Pattern for Run dialect is predominantly male image, and exaggerate male limbs maximum size, called “Hercules” Dragon was one of the most common animals in Run dialect, and its expression likes Hercules The human figure in Sai dialect is relatively simple, without decorative details Animal and plant patterns were used more in Meifu dialect. Li nationality has a total of five branches of dialects, such as Ha, Qi, Run, Meifu and Sai dialects. In order to better inherit Li brocade culture, the theory of computer graphics image was used in the paper to research Li brocade designs in-depth and characteristic analysis, and presents a shape feature extraction technology.Ģ.2 Analysis of shape characteristics of Li brocade patternĪccording to the shape characteristic, Li brocade pattern can be classified into seven categories: people, animals, plants, geometric lines, scenes, tools and text lines 4. It marks that the ancient skills will continue to undertake the important task of historical culture. In November 2011, Hainan Li brocade cultural heritage protection and inheritance research project officially started.
In October 2009, “Li traditional dyed spun weaving and embroidery technology” was elected in the United Nations non-material cultural heritage list 3. The process of Li brocade pattern language extraction is one of understanding, and its characteristics are enough to show perfect fusion of logic and thinking in the creating process 2. At present, Li brocade skill is endangered. Only dozens of common patterns can be interpreted in over 160 Li patterns at the moment 1. A lot of design style has been lost in its long handed down process from mouth to mouth due to complicated Li brocade design decoration. It has a deep connotation, representing different clan totem, marking the different language characteristics.
Li brocade pattern is to take the people or things occurred around Li women as subjects to paint in color and weave them on the brocade. It has extremely profound influence to the revitalization and development of Hainan tourism cultural undertakings. Li brocade is a feature of the culture of Hainan Island. The results showed that the pattern extraction method to Li brocade pattern shapes is feasible and effective according to above method.
At last, different patterns of Li brocade design are briefly analyzed according to the digital characteristics. The extracted contour features were processed by means of morphology, and digital characteristics of contours are obtained by invariant moments. First, edge detection was made on the design patterns, and then the morphological closing operation was used to smooth the image, and finally contour tracking was used to extract the outer contours of Li brocade patterns. The meaning of Li brocade patterns was analyzed and the shape feature extraction techniques to original Li brocade patterns were advanced in this paper, based on the contour tracking algorithm. Hainan Li brocade skills has been listed as world non-material cultural heritage preservation, therefore, the research on Hainan Li brocade patterns plays an important role in Li brocade culture inheritance.