1. 3D Digitalization of Woodblocks

 

3D digitalization is the process of scanning and collecting detailed data of an object from the real world, creating a digital model that reflects the shape, color, and contour of the object. Similar to paper documents, to ensure compliance with the provisions of the Law on Protection of State Secrets 2018, the digitization of Woodblocks ensures that they do not contain confidential information. This technology is becoming a powerful tool in the preservation of cultural heritages

 

2. 3D Digitalization Methods

 

Currently, there are three most popular methods for 3D digitization of physical objects: structured light scanners, 3D laser scanners, and photogrammetry.

 

2.1 Digitization method using 3D scanners using structured light

Operating principle

Structured light scanners work by projecting structured light areas (usually stripes) onto the surface of the sample. The camera will track the changes of these light stripes as it scans the object, thereby collecting data and reconstructing an accurate 3D model of the object. The system usually includes a projector and two cameras that record and calculate the positions of thousands of data points on the surface of the object.

When scanning, the object will be rotated or the projector will move to capture different angles, repeating this process until a 360° circle is completed. Structured light scanners usually use white light or blue light, with blue light providing higher resolution and more accurate scanning.

 

 

Advantages

• Does not affect vision.

• Low investment cost, ranging from tens of millions to hundreds of millions of VND.

 

Disadvantages:

• Low accuracy and resolution.

• Slow scanning speed, easily affected by light from the environment.

• Does not work effectively with shiny, reflective, transparent or black surfaces because light is easily scattered, absorbed, causing errors in calculations when scanning.

 

2.2 Method of using 3D laser scanner

Operating principle

3D laser scanners use laser beams to project onto the surface of the object, then the camera captures the reflection of the laser beam. The process of recognizing and calculating the change in the reflection angle will help reconstruct the 3D model of the object. The data points from the laser form a point cloud, simulating the 3D image of the object in detail and accurately.

Laser scanners are capable of scanning at distances from several hundred meters to several kilometers, recording data with an accuracy of less than 5mm. To scan large objects, it is necessary to use multiple scanner stations from different angles, then combine them to form a complete point cloud. The data can be exported to CAD software or BIM programs to create 2D, 3D drawings, or complete models.

 

 

Advantages

• Fast scanning speed.

• High accuracy.

• Can scan glossy, dark surfaces without using anti-reflective powder.

• Unaffected by light factors from the surrounding environment.

 

Disadvantages

• High cost, from hundreds of millions to billions of VND.

• Cannot scan transparent objects.

• Can be dangerous to the eyes if exposed directly to laser beams.

 

2.3 Photogrammetry method

Operating principle

Photogrammetry is a technique of measuring and taking pictures from many different angles to collect 3D data by calculating the coordinates of characteristic points on the object. Image processing software identifies common points that repeat in the image, then reconstructs a 3D model by connecting these points. The more photos taken from different angles, the more accurate the 3D model.

Photogrammetry is suitable for large objects, especially in industries such as thermal power, metal casting, and automobile manufacturing. Some modern laser scanners integrate photogrammetry to increase the accuracy when scanning large objects.

 

 

Advantages

• Only the cost of processing software, can use images from digital cameras.

• Model large objects and are not affected by ambient light.

• Does not depend on surface material and allows true color recording.

 

Disadvantages

• Long processing time due to the time required to run algorithms and depends on the processing capacity of the computer.

• Lowest accuracy and resolution among 3D digitization methods.

 

3D digitization of woodblocks opens up new opportunities in preserving cultural heritage, helping traditional values ​​to be preserved and accessed more easily. Depending on specific requirements, each digitization method will have its own advantages and disadvantages, suitable for different applications. Choosing the right method will help optimize the digitization process, ensure data quality and meet the needs of use in many different fields.

 

>>>>>> See more: 3D digitization of woodblocks is the fastest, sharpest, most accurate and cheapest

 

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