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When moment-preserving auto threshold algorithm is used to segment image whose histogram is unimodal or monotonic function, there is serious background interference, and the segmentation accuracy is greatly affected by the size variance of the object, so this paper puts forward an improved moment-preserving auto threshold algorithm. Aiming at the original(More)
Keywords: Pulsed eddy current (PEC) Rectangular coil Edge identification Feature extraction Transient response signal a b s t r a c t The Pulsed Eddy Current (PEC) testing is an increasingly emerging nondestructive testing & evaluation (NDT&E) technique. The main purpose of this study is to improve the performance of defect edge identification of C-scan(More)
The estimation of fundamental matrix is a key problem in computer vision and also the basis of active vision. A new linear iterative algorithm for estimating the fundamental matrix has been presented. The algorithm is based on minimizing the actual distances between the projection points and their matched epipolar lines. The first two fundamental matrixes(More)
Multi-frequency eddy current test (MFECT) is an important NDT technology, and it can be applied to realize multi-parameter detection and interference elimination effectively. Aiming at the problem that conventional single-frequency eddy current test can only identify defects but can't classify defects effectively, a new MFECT technology which adopts LFM(More)
In this paper, based on ARM9 microcontroller S3C2440A and embedded operating system Windows CE, a new nondestructive system was established. The system uses borescope and eddy current testing dual techniques combined into a single probe, which takes advantage of borescope and eddy current testing. The system combines traditional nondestructive testing(More)
Pulsed eddy current (PEC) stimulated thermography is proposed as a powerful non-destructive evaluation (NDE) technique, allowing the operator to observe the heating developed from the eddy current distribution in a structure using infrared imaging, detecting defects over a relatively wide area within a short time. Some defects (impact, delamination, disbond(More)
In the aviation in-situ eddy current non-destructive testing (ECNDT), there are increasing requirements for speediness, intelligence and integration. The signal conditioning bridge ciruit is one of the most important parts for realizing the requirements. This work proposes an approach to develop a novel digitally controlled bridge (DCB), which is based on(More)
—Multi-frequency eddy current test technique is applied in the industrial non-destructive testing more and more widely. Every frequency component contains the useful information and the harmful noise when the eddy current sensor is excited by several sine signals. The impedance property of the sensor is a key element in the test system, so this paper(More)