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Author: search.filters.author.Anuwongpinit, T.

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    Crack Detection of Eggshell using Image Processing and Computer Vision
    (2022-01-01)
    Purahong, B.
    ;
    Chaowalittawin, V.
    ;
    Krungseanmuang, W.
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    Sathaporn, P.
    ;
    Anuwongpinit, T.
    This article presents an eggshell crack inspection using image processing techniques. This approach uses the concept of industrial 4.0 to reduce manual coordination in the egg industry's manufacturing process. The method started with receiving images from a webcam camera. Then, we rescaled the image to 1147 x 633 for faster computation. Next, divide the image into the red and green channels. The red channel image was converted to grayscale using a Gaussian blur filter with a kernel filter 11 x 11 to reduce noise, followed by turning the image to binary. After that, multiply the binary image with the grayscale of the green channel to remove the background. By that time, a morphological operation was used to enhance the quality of the image. Finally, use the contour matrix to find the area of the object and then build the condition to detect the crack in the eggshell. These techniques of image processing are used to inspect the eggshell crack with a high accuracy of more than 98% as well as the high performance of computing.
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    Sine-Squared Pulse Approximation for Matched Filter Design Using Generalized Bessel Polynomials and Particle Swarm Optimization
    (2022-01-01)
    Chutchavong, V.
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    Anuwongpinit, T.
    ;
    Pumee, T.
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    Benjangkaprasert, C.
    ;
    Janchitrapongvej, K.
    This paper presents the study of mathematical characteristics of generalized Bessel polynomial that can be applied to approximate a sine-squared pulse for designing matched filters in communication systems. The proposed pulse can be designed by using the transfer function, in which the numerator is the five pairs of a transmissions zero pairs, and the generalized Bessel polynomial is used as the denominator. A parameters of generalized Bessel polynomials can be adjusted by particle swarm optimization to find the best parameter value. From the simulation results can be found that a parameter can be adjusted. A proposed pulse is close to the ideal response in mainlobe, and one sidelobe to four sidelobes with stability, which outperformed previous research.
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    Implementation of ECG portable device for real-time signal monitoring
    (2017-11-24)
    Purahong, B.
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    Thongkrairat, S.
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    Anuwongpinit, T.
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    Chutchavong, V.
    ;
    Aoyama, H.
    In this paper presents a system for heart rate signal analysis in ECG (Electrocardiography) format using STM32f7 board. Electrode is used for recording the signal with stick on body in lead 2 orientations. Signal processing method are used upper average, slope and interval checking algorithm to process ECG signal in real-time. In experiment, to acquire a frequency of heart beat and display ECG signal and heart rate on STM32f7 board compare with wearable device that result have error rate less than 1%. This system is portable to use and sufficient battery for recording signal to analyze and monitor throughout the day.
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    Low pass filters based on bernstein-balazs operators
    (2017-11-24)
    Chutchavong, V.
    ;
    Tharaphimaan, P.
    ;
    Anuwongpinit, T.
    ;
    Purahong, B.
    ;
    Janchitrapongvej, K.
    This paper presents a design of low-pass filter by using Bernstein-Balazs operators. It has more parameters than classical Bernstein polynomials. The parameters and can adjust maximally flat, slope of linear phase and constant of delay. In the results, the proposed method shows the magnitude response has maximally flat, linear with non-minimum phase and nearly constant delay. The example of applications of this proposed method is desired to design the gain equalizer at -1dB and confirm the stability of the approximated transfer function by Mihailov’s criterion.
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    Approximation of sine-squared pulse with additional transmission zero using bessel polynomials
    (2017-11-24)
    Chutchavong, V.
    ;
    Anuwongpinit, T.
    ;
    Benjangkaprasert, C.
    ;
    Janchitrapongvej, K.
    In this paper, the approximation of sine-squared pulse based on Bessel polynomials with additional transmission zero is presented. The additional transmission zero has a parameter alpha to control the attenuation response. The simulation results show the additional transmission zero can control the peak of attenuation response close to the ideal response. In addition, the orders of Bessel polynomials are decreased that confirm a performance is better than the previous works.