Method for extracting stele inscription digital rubbing based on three-dimensional data scanning

Abstract

The invention relates to a method for extracting a stele inscription digital rubbing based on three-dimensional data scanning. The method includes the following steps that (1) a stele inscription is scanned through a three-dimensional data scanner, so that point cloud data are acquired; (2) a 3D model of the stele inscription is established; (3) according to the 3D model, a depth map of the stele inscription is acquired; (4) the depth map is copied and two depth maps are overlapped; (5) the upper-layer depth map of the stele inscription in a layer blending mode is processed downwards in a linear dodging blending mode, the processed upper-layer map is blended with the lower-layer map, a blended map is acquired, and the brightness and the contrast ratio of the blended map are increased; (6) curve adjustment is conducted on the processed blended map; (7) the storage quality of the stele inscription is judged, and if the storage quality is good, the step (9) is conducted, and otherwise, the step (8) is conducted; (8) artificial optimizing processing is conducted on the blended map obtained after curve adjustment; (9) chromaticity inverse phase operation is conducted and the digital rubbing is generated.

Description

technical field [0001] The invention relates to a method for extracting rubbings of steles and inscriptions, in particular to a method for extracting digital rubbings of steles and inscriptions based on three-dimensional data scanning. Background technique [0002] Stone inscriptions, especially stele inscriptions, play an important role in preserving and inheriting history and culture because of the written content recorded on them and the patterns depicted. Rubbings are one of the important carriers to record the culture of the Chinese nation, and have high aesthetic value and historical and cultural value. However, traditional rubbings face some problems: 1. The rubbing process of traditional rubbings generally includes several steps of cleaning utensils, papering, inking and removing, and the whole process is handmade. The quality of a rubbing basically depends on the experience and proficiency of the producer, including the grasp of the degree of dryness and wetness of...

AI Technical Summary

Problems solved by technology

However, traditional rubbings face some problems: 1. The rubbing process of traditional rubbings generally includes several steps of cleaning utensils, papering, inking and removing, and the whole process is handmade

The traditional rubbing method can only generate one rubbing at a time, which not only takes a long time, but also cannot be mass-produced

2. The production of traditional rubbings will cause damage to the original stone carvings. In the process of making traditional rubbings, it is easy to leave ink marks on the stone carvings. Most of the stone carvings are old. Once the ink touches, it will penetrate immediately and cannot be washed off. produce permanent residue

In the process of making traditional rubbings, actions such as brushing bletilla striata water, beating, and exposing will cause varying degrees of damage to the stone carvings themselves. The older the stone carvings, the greater the damage, which is not conducive to the preservation and protection of the cultural relics themselves.

3. The traditional rubbing method is technically difficult when making rubbings of some large stone carvings, and it needs to build auxiliary facilities such as brackets and ladders, which is inefficient and dangerous

4. Traditional rubbing technology has great limitations for relief stone carvings. Due to the large depth difference of many reliefs, it is difficult to extract the relief texture well by traditional rubbing technology

5. At present, most of the domestic stone inscriptions and rubbings are preserved scattered, and the forms of protection and utilization are single. Most of them only make exquisite rubbings for collection and put them on the shelves. They cannot be managed and protected systematically, and limit the breadth and depth of their research and utilization. , so that the value of cultural relics, historical materials and realistic value of stone carvings cannot be fully realized

6. The storage method of traditional rubbings has strict requirements on the environment, and problems such as extrusion, moving and aging of paper fibers will inevitably cause damage to rubbings

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