Watermarking of a 3D Model based on Wavelet Transform

Iraqi Journal of Science ◽

10.24996/ijs.2021.62.12.36 ◽

2021 ◽

pp. 4999-5007

Author(s):

Muna M. Laftah

Keyword(s):

Wavelet Transform ◽

Frequency Domain ◽

Correlation Coefficient ◽

Digital Watermarking ◽

3D Model ◽

Low Frequency ◽

3D Models ◽

Robust Watermarking ◽

Medical Field ◽

Different Types

In the last decade, 3D models gained interest in many applications, such as games, the medical field, and manufacture. It is necessary to protect these models from unauthorized copying, distribution, and editing. Digital watermarking is the best way to solve this problem. This paper introduces a robust watermarking method by embedding the watermark in the low-frequency domain, then selecting the coarsest level for embedding the watermark based on the strength factor. The invisibility of the watermark for the proposed algorithm is tested by using different measurements, such as HD and PSNR. The robustness was tested by using different types of attacks; the correlation coefficient was applied for the evaluation of the extracted watermark. From the results, it is clear that the proposed algorithm achieved good invisibility and robustness against the geometrical attack and the added noise.

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A Kind of DWT Domain Image Digital Watermarking Algorithm Research

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1044-1045.991 ◽

2014 ◽

Vol 1044-1045 ◽

pp. 991-994

Author(s):

Tao Liu

Keyword(s):

Image Processing ◽

Wavelet Transform ◽

Frequency Domain ◽

Digital Watermarking ◽

Wavelet Decomposition ◽

Low Frequency ◽

Discrete Wavelet ◽

Original Image ◽

Adaptive Watermarking ◽

Frequency Domain Methods

An image-adaptive watermarking algorithm based on wavelet transform was proposed. At first, A digital image used as watermarking was scrambled. Next, the original image was decomposed by discrete wavelet transform,and in accordance with the characteristics of human visual system, wavelet decomposition in the low-frequency domain, Methods which average of adjacent domain instead of single wavelet decomposition coefficients was used to estimate and quantitative, watermarking was adaptively embedded in wavelet coefficients of low-frequency domain. At last, the simulation experimental results show that the algorithm for a variety of conventional image processing has good robustness.

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Digital Watermarking Based on Chaotic Encryption and Wavelet Transformation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.3054 ◽

2011 ◽

Vol 403-408 ◽

pp. 3054-3058 ◽

Cited By ~ 1

Author(s):

Yuan Mei Wang ◽

Tao Li

Keyword(s):

Wavelet Transform ◽

Digital Watermarking ◽

Wavelet Transformation ◽

Low Frequency ◽

Experimental Results ◽

Transform Domain ◽

Chaotic Encryption ◽

Watermark Image ◽

Arnold Transform ◽

Host Image

In the paper a digital watermarking algorithm based on chaotic encryption and wavelet transform is proposed. It uses Arnold transform to encrypt the original watermark image, and then decomposes the original host image to different frequency sub-image, combining with the merits of transform domain watermarking algorithm. The encrypted watermark image is embedded into the low-frequency coefficients of image by wavelet transformation. Experimental results confirm that the algorithm has good robustness.

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Identification and evaluation for the dynamic signals caused by pressure fluctuation of aerostatic slider

Industrial Lubrication and Tribology ◽

10.1108/ilt-11-2016-0271 ◽

2018 ◽

Vol 70 (6) ◽

pp. 927-934 ◽

Cited By ~ 2

Author(s):

Dongju Chen ◽

Jihong Han ◽

Xianxian Cui ◽

Jinwei Fan

Keyword(s):

Wavelet Transform ◽

Correlation Analysis ◽

Frequency Domain ◽

Low Frequency ◽

Measured Signal ◽

Analysis Method ◽

Content Type ◽

Correlation Analysis Method ◽

The Impact ◽

Signal Correlation

Purpose To identify the dynamic feature of the aerostatic slider caused by gas film, an evaluation system by a piezoelectric acceleration sensor is presented in time and frequency domain. Design/methodology/approach The dynamic pressure fluctuation is evaluated by the wavelet transform, cross correlation analysis and power spectral density (PSD). Wavelet transform is used to process the measured result of the aerostatic slider and the signal is decomposed into high-frequency and low-frequency signal. Correlation analysis method is used to evaluate the impact of the initial gas gap on the fluctuation in time domain. Findings According to the PSD analysis of the processed signal in the frequency domain, the natural frequency of the aerostatic slider is identified from the measured signal in frequency domain; this method provides a basis for the identification of guideway errors. Research limitations/implications The method can also be applied to the error identification of other components of the machine tool. Originality/value Wavelet transform is used to process the measured result of the aerostatic slider by acceleration sensor, and the signal is decomposed into high-frequency and low-frequency signal. Correlation analysis method is used to evaluate the impact of the initial gas gap on the fluctuation in time domain. According to the PSD analysis of the processed signal in the frequency domain, the natural frequency of the aerostatic slider is identified from the measured signal in frequency domain; this method provides a basis for the identification of slider errors.

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Condition Monitoring of Marine Couplings by Means of Vibration Analysis Techniques

Volume 8: 22nd Reliability, Stress Analysis, and Failure Prevention Conference; 25th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2013-12806 ◽

2013 ◽

Author(s):

Simone Delvecchio ◽

Gianluca D’Elia ◽

Giorgio Dalpiaz

Keyword(s):

Wavelet Transform ◽

Frequency Domain ◽

Vibration Analysis ◽

Angular Speed ◽

Experimental Comparison ◽

Discrete Wavelet ◽

Propeller Shaft ◽

Frequency Domain Methods ◽

Different Types ◽

Marine Diesel

This paper shows the application of some processing techniques for the vibration analysis in working conditions of two different types of marine flexible couplings for boat propulsion. The flexible couplings are mounted between the flywheel of the marine diesel engine and the propeller shaft. The vibration signals are processed in time and frequency domain. Moreover, due to the presence of impulses in the signals, Continuous (CWT) and Discrete Wavelet Transform (DWT) are applied and compared with the conventional time and frequency domain methods. In this work the wavelet analysis is used for the impulse component extraction and the choice of different wavelet functions for this purpose is evaluated. The experimental comparison between two different types of couplings is also given. The results suggest that the wavelet transform techniques are effective to indicate which type of coupling provides a good vibrational behaviour especially in working condition when the angular speed of the propeller shaft is often inverted.

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Discrete wavelet transform processing system based on digital watermarking algorithm

Journal of Physics Conference Series ◽

10.1088/1742-6596/2083/4/042075 ◽

2021 ◽

Vol 2083 (4) ◽

pp. 042075

Author(s):

Miao Shi

Keyword(s):

Image Processing ◽

Wavelet Transform ◽

Discrete Wavelet Transform ◽

Digital Watermarking ◽

Basic Principle ◽

Low Frequency ◽

Processing System ◽

Discrete Wavelet ◽

Noise Interference ◽

Arnold Scrambling

Abstract This paper introduces the concept of multimedia digital watermarking and summarizes the current technology status. This paper summarizes the research status and basic principle of digital watermarking. The advantages of digital watermarking algorithm based on wavelet transform are analyzed. The proposed algorithm combines Arnold scrambling method and DWT transform multi-resolution characteristics, and adopts linear and different embedding strength methods. Effectively improve the security of the watermark. According to the classification results, different intensity watermarking components are embedded into the DCT low frequency coefficients of different image blocks. Experimental results show that this algorithm has strong masking and robustness, and the watermarking realized by using the proposed algorithm has good robustness against common image processing and noise interference.

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An Augmented Reality based Learning App

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.a2165.059120 ◽

2020 ◽

Vol 9 (1) ◽

pp. 925-928

Keyword(s):

Augmented Reality ◽

Mobile Phone ◽

Human Body ◽

3D Model ◽

3D Models ◽

Body Parts ◽

Human Organs ◽

Augmented Reality Application ◽

Different Types ◽

Memory Power

There are so many different types of applications that deal with various sectors of augmented reality, that provides augmented facility for learning. But there is no particular augmented reality software that is designed to detail out information of the interior parts of the human body with its organs, thus we have initiated and designed an augmented reality application that shows all the information and 3D Models about the interior organs of the human body, we need to know about with the help of some special markers present physically in every iconic spot. This information displayed visually is dynamically maintained and also provides the Students with a 3D visual of the Human organs, where the students will be given an application with several pictures for visualizing the 3D model of the organs with its interior parts. This could greatly help the students to gain knowledge about body parts by using mobile phone and also this will help the students to increase their memory power by visualizing them.

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CAT-based Digital Watermarking Algorithm using the Low-Low Frequency Domain

International Journal of Information Processing and Management ◽

10.4156/ijipm.vol2.issue4.6 ◽

2011 ◽

Vol 2 (4) ◽

pp. 54-62 ◽

Cited By ~ 1

Author(s):

Xiaowei Lia ◽

Taehee Namb ◽

Seokki Leea ◽

Seoktae Kima

Keyword(s):

Frequency Domain ◽

Digital Watermarking ◽

Low Frequency

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Quality of 3D Models Generated by SFM Technology

Slovak Journal of Civil Engineering ◽

10.2478/sjce-2013-0017 ◽

2013 ◽

Vol 21 (4) ◽

pp. 13-24 ◽

Cited By ~ 7

Author(s):

Marián Marčiš

Keyword(s):

Computer Vision ◽

Camera Calibration ◽

3D Model ◽

Automatic Detection ◽

3D Models ◽

Exterior Orientation ◽

Time Consumption ◽

Financial Costs ◽

Different Types

Abstract Using various types of automation in digital photogrammetry is associated with questions such as the accuracy of a 3D model generated on various types of surfaces and textures, the financial costs of the equipment needed, and also the time costs of the processing. This topic deals with the actual technology of computer vision, which allows the automated exterior orientation of images, camera calibration, and the generation of 3D models directly from images of the object itself, based on the automatic detection of significant points. Detailed testing is done using the Agisoft PhotoScan system, and the camera configuration is solved with respect to the accuracy of the 3D model generated and the time consumption of the calculations for the different types of textures and the different settings for the processing.

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Development of 3D Printing Software for Medical Customized Treatments

Journal of Engineering and Science Research ◽

10.26666/rmp.jesr.2018.2.7 ◽

2019 ◽

Vol 3 (2) ◽

pp. 46-51

Author(s):

Keyword(s):

3D Printing ◽

Software Development ◽

3D Model ◽

3D Models ◽

Medical Field ◽

Tomographic Images ◽

Development Method ◽

Morphological Process ◽

Look Up Table ◽

3D Printers

3D printing technology is widely used in the medical field. In particular, many customized treatments are being produced and studied. Customized treatments can be created using 3D printers, and 3D models and Gcodes for individuals can be created using tomographic images. It is important to create a 3D model by precise segmentation of tomographic images. In order to increase the precision of segmentation, we applied the adaptive thresholding method with morphological process. We applied a look-up table to quickly correct holes and vertex errors in 3D models. In this paper, we proposed the 3D printing software development method for customized treatments.

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