디지털 이미지를 이용한 변위측정에 미치는 노이즈의 영향
Effect of Noise on Displacement Measurement Using Digital Images
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참고문헌
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초록
The digital image correlation method is useful and widely used to measure the deformation of thin film materials for mechanical testing and provides full-field deformation of the specimen. The accuracy and precision of the digital image correlation method depends on the quality of the image obtained during the test. The noise included in the digital image causes errors in the calculated displacement results. Strain is calculated by differentiating the displacement, so the effect of noise is amplified in the calculated result of strain. Therefore, noise is one of the most important factors in measuring displacement using images. In order to evaluate the effect of noise, one hundred images were taken continuously in a stationary state and the distribution of the local strain was calculated using digital image correlation. If the size of the subset is greater than 15×15pixel, the calculated results for strain show that the effect of noise is within the maximum error range of 1% and the standard deviation is 0.11% or less.
Abstract
The digital image correlation method is useful and widely used to measure the deformation of thin film materials for mechanical testing and provides full-field deformation of the specimen. The accuracy and precision of the digital image correlation method depends on the quality of the image obtained during the test. The noise included in the digital image causes errors in the calculated displacement results. Strain is calculated by differentiating the displacement, so the effect of noise is amplified in the calculated result of strain. Therefore, noise is one of the most important factors in measuring displacement using images. In order to evaluate the effect of noise, one hundred images were taken continuously in a stationary state and the distribution of the local strain was calculated using digital image correlation. If the size of the subset is greater than 15×15pixel, the calculated results for strain show that the effect of noise is within the maximum error range of 1% and the standard deviation is 0.11% or less.
참고문헌 (7)
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