Results 21 to 30 of about 4,867 (182)
A Novel Autofocus Measure Based on Weighted Walsh-Hadamard Transform
IEEE Access, 2019 The autofocus measure plays an important role in passive digital imaging systems. However, most of the existing methods are more sensitive to the noise. In order to overcome this drawback, we proposed a novel autofocus measure based on the weighted Walsh-
Liqiang Guo, Xiang Cao, Lian Liu
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Autofocus by deep reinforcement learning
IS&T International Symposium on Electronic Imaging, 2019 Chin-Cheng Chan
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Micromachines, 2022 For many parasitic diseases, the microscopic examination of clinical samples such as urine and stool still serves as the diagnostic reference standard, primarily because microscopes are accessible and cost-effective.
Prosper Oyibo +10 more
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Design and Experimental Validation of an Optical Autofocusing System with Improved Accuracy
Photonics, 2023 This study proposes a modified optical design to improve the issue of autofocus accuracy in existing optical systems. The proposed system uses lens offset to convert incident light into non-parallel light, achieving a focus shift and avoiding severe ...
Jui-Hsiang Hung +3 more
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Improved entropy-based autofocus correction for synthetic aperture radar
The Journal of Engineering, 2019 Autofocus is an essential step in order to obtain the well-focused synthetic aperture radar image. Compared to the non-parametric autofocus, the parametric way is not subjected to the prominent targets so much.
Qianrong Lu +3 more
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Modulation Linearization Technique for FM/CW SAR Image Processing Using Range Migration
Applied Sciences, 2021 Linear FMCW radar suffers from impairments in range and range rate if there are errors in the modulation rate or phase discontinuities. Often, this is a result of a nonlinearity of the voltage-controlled oscillator that is in the source of the transmit ...
Theodore Grosch, Cyril Okhio
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Leida xuebao, 2016 Sparse microwave imaging is new concept, theory and methodology of microwave imaging, which introduces the sparse signal processing theory to microwave imaging and combines them together to overcome the paradox of increasing system complexity and imaging
Zhang Zhe +3 more
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Exploiting Loops in the Camera Array for Automatic Focusing Depth Estimation
International Journal of Advanced Robotic Systems, 2013 Autofocus is a fundamental and key problem for modern imaging sensor design. Although this problem has been well studied in single camera literature, unfortunately, little research has been done on large-scale camera arrays.
Tao Yang +3 more
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Simplified and approximation autofocus back-projection algorithm for SAR
The Journal of Engineering, 2019 Due to accuracy limited inertial measurement unit systems, residual synthetic aperture radar (SAR) motion errors need to be compensated by autofocus method. Back-projection (BP) algorithm is a time-domain imaging process suitable for arbitrary trajectory
Zhenyu Guo, Hongbo Zhang, Shaohua Ye
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An Autofocus Method Based on Improved Differential Confocal Microscopy in Two-Photon Lithography
Photonics, 2023 Two-photon lithography (TPL) plays a vital role in microstructure fabrication due to its high processing accuracy and maskless characteristics. To optimize the manufacturing quality deteriorated by the defocus of the substrate, an autofocus approach ...
Zhenyu Yang +4 more
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