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Length measurement of internal defects in butt welds is very important for the quantitative assessment of ultrasonic testing. Ultrasonic phased array testing technology has been widely used because of great detection rate and detection efficiency. We analyzed characteristics and causes of ultrasonic phased array length measurement to provide an important basis for ultrasonic phased array testing process...
The Directionlet is an anisotropic multi-direction method with perfect reconstruction and critical sampling based on lattice, and it has obvious advantages in image edges. Based on analysing different EPMA image features, this paper starts extracting edges based on integral lattice, setting corresponding windows to compare mean value and standard deviation, and then begin weighted fusion based on...
Listeria monocytogenes is a food-borne pathogen which can cause zoonosis. A detection method based on real time reverse-transcription PCR amplification of mRNA was established in the study. This method can overcome false-positive result caused by amplification of nonviable L.monocytogenes. Sensitivity and specificity of the method were studied, as well as artificially contaminated dairy products by...
Based on the analysis of the characteristics of electron probe image, This paper proposes a novel EPMA image fusion scheme based on contourlet transform. As a novel multiscale geometric analysis tool. Contourlet has shown many advantages over the conventional image representation methods. It provides flexible number of directions and captures the intrinsic geometrical structure of images. The efficient...
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