Ashish M. Kothari

Work place: Shri Jagdishprasad Jhabarmal Tibrewala University

E-mail: amkothari@aits.edu.in

Website:

Research Interests: Image Processing, Image and Sound Processing, Computer Graphics and Visualization, Embedded System

Biography

Mr. Ashish M. Kothari has completed his bachlor and masters degree in the Electronics & Communication Engineering from saurashtra university, rajkot, gujarat, india and he is currenly pursuing his Ph. D. in the same discipline from shree jagdishprasad jhambarmal tibrewal university, jhunjhunu, rajsthan, india. His Area of reaserch is to design a robust method for the video watermarking. He is currently working as an assistant professor in the department of electronics & communication engineering at Atmiya Institute of technology & science, rajkot, gujarat, india. He is also appointed as a director of the UDISHA club by Gujarat Technological University for the rajkotveraval sankul 1. He is also appointed as PG coordinator for the masters program in EC in the department of Electronics & Communication at Atmiya Institute of technology & science, rajkot, gujarat, india. He has guided more than 20 UG students in their project work and more than 7 students in their dissertation work at PG level. He has presented 12 national and international papers and published 4 international papers. He has published a book titled real time anlysis of digital image watermarking with Lambart Publishing house, Germany. His area of interest is Image and video processing, microcontrollers and embedded systems.

Author Articles
Real Time Depth Data Refurbishment in Frequency Domain and 3D Modeling Map Using Microsoft Kinect Sensor

By Kapil S. Raviya Dwivedi Ved Vyas Ashish M. Kothari

DOI: https://doi.org/10.5815/ijigsp.2016.11.07, Pub. Date: 8 Nov. 2016

The present decade has seen the growth of both, the software and hardware for three dimensional televisions in real time applications. Depth map is fundamental key of 3-Dimensional algorithms. Reliable depth map is an acceptance in 3D transmission, analysis and compression of algorithm. Computer vision and pattern recognition research fields use sensor like low cost Microsoft kinect. Kinect sensor suffers from some problems of noise, poor accuracy and unmatched edges. This paper presents effective solution to improve the real time depth sequences and real time 3-D map using warping method from kinect sensor.
We proposed real time frequency domain based depth data refurbishment and improve the quality of depth video provided by sensors' Microsoft Kinect. The quality of the depth map is improved by depth refurbishment in frequency domain technique, filling the holes present in the maps, 2-Dimensional spatial filtering and permutation of morphological operation. We show that the proposed approach is able to generate high quality depth maps which can be quite useful in improving the performance of various applications of Microsoft Kinect such as obstacle detection and avoidance, pose estimation, gesture recognition, skeletal and facial tracking, etc. We produce the real time 3-D map using warping method. An experimental result shows that the quality of our proposed method is better than previous research works. Our algorithm produces noise less, reliable, smooth and efficient depth sequence. The qualitative parameter Peak Signal to Noise Ratio (PSNR), Structure Similarity Index Map (SSIM) and Mean Square Error (MSE) measure the real time results for comparative analysis.

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An Evaluation and Improved Matching Cost of Stereo Matching Method

By Kapil S. Raviya Dwivedi Ved Vyas Ashish M. Kothari

DOI: https://doi.org/10.5815/ijigsp.2016.10.06, Pub. Date: 8 Oct. 2016

The main target of stereo matching algorithms is to find out the three dimensional (3D) distance, or depth of objects from a stereo pair of images. Depth information can be derived from images using disparity map of the same scene. There are many applications of computer vision like People tracking, Gesture recognition, Industrial automation and inspection, Security and Biometrics, Three-dimensional modeling, Web and Cloud, Aerial surveys etc. There are large categories of stereo algorithms which are used for finding the disparity or depth. This paper presents a proposed stereo matching algorithm to obtain depth map, enhance and measure. The hybrid mathematical process of the algorithm are color conversion, block matching, guided filtering, Minimum disparity assignment design, mathematical perimeter, zero depth assignment, combination of hole filling and permutation of morphological operator and last non linear spatial filtering. Our algorithm is produce noise less, reliable, smooth and efficient depth map. We obtained the results with ground truth image using Structural Similarity Index Map (SSIM) and Peak Signal to Noise Ratio (PSNR). 

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Video Watermarking – Combination of Discrete Wavelet & Cosine Transform to Achieve Extra Robustness

By Ashish M. Kothari Ved Vyas Dwivedi

DOI: https://doi.org/10.5815/ijigsp.2013.03.05, Pub. Date: 8 Mar. 2013

In this paper we worked on the video watermarking technique wherein we took video as a cover medium and some binary images as watermark to be embedded behind the video. Specifically we concentrated on the transform domain technique and we made use of hybridization of the two of the most important and useful transformations, namely Discrete Wavelet Transform and Discrete Cosine Transform, for the purpose of digital watermarking. We evaluated the proposed method with some visual quality matrices and based on the results we concluded that the proposed method provides extra robustness against various attacks as compare to individual use of each transform.

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Hybridization of DCT and SVD in the Implementation and Performance Analysis of Video Watermarking

By Ashish M. Kothari Ved Vyas Dwivedi

DOI: https://doi.org/10.5815/ijigsp.2012.05.02, Pub. Date: 8 Jun. 2012

In this Paper, We worked and documented the implementation and performance analysis of digital video watermarking that uses the hybrid features of two of the most powerful transform domain processing of the video and fundamentals of the linear algebra. We have taken into the account fundamentals of Discrete Cosine Transform and Singular Value Decomposition for the development of the proposed algorithm. We first used the Singular Value Decomposition and then used the singular values for the insertion of the message behind the video. Finally we used two of the visual quality matrices for the analysis purpose. We also applied various attacks on the video and found the proposed scheme more robust.

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