Results 131 to 140 of about 4,867 (182)
Some of the next articles are maybe not open access.
2017 6th Mediterranean Conference on Embedded Computing (MECO), 2017
The problem of autofocus in radar imaging systems is considered in this paper. It is offered to process modulus of a reflected signal to exclude phase errors from consideration. It is shown that the offered technique can work well with small resolution improvement factors. The technique is tested with modeling and real life signal processing.
Sergey Vityazev +2 more
openaire +1 more source
The problem of autofocus in radar imaging systems is considered in this paper. It is offered to process modulus of a reflected signal to exclude phase errors from consideration. It is shown that the offered technique can work well with small resolution improvement factors. The technique is tested with modeling and real life signal processing.
Sergey Vityazev +2 more
openaire +1 more source
Deep Learning for Camera Autofocus
IEEE Transactions on Computational Imaging, 2021Most digital cameras use specialized autofocus sensors, such as phase detection, lidar or ultrasound, to directly measure focus state. However, such sensors increase cost and complexity without directly optimizing final image quality. This paper proposes a new pipeline for image-based autofocus and shows that neural image analysis finds focus 5-10x ...
Chengyu Wang 0006 +4 more
openaire +1 more source
Third International Conference on Application of Concurrency to System Design, 2003. Proceedings., 2004
Software engineering for distributed automotive applications is shifting from a subsystem-level perspective, where the focus is on optimization of a single electronic control unit, towards a system-level view. However, optimization of distributed systems with respect to non-functional properties remains a challenging task.
Jan Romberg +4 more
openaire +1 more source
Software engineering for distributed automotive applications is shifting from a subsystem-level perspective, where the focus is on optimization of a single electronic control unit, towards a system-level view. However, optimization of distributed systems with respect to non-functional properties remains a challenging task.
Jan Romberg +4 more
openaire +1 more source
Journal of Microscopy, 2009
SummaryReliable autofocusing is a critical part of any automated microscopy system: by precisely positioning the sample in the focal plane, the acquired images are sharp and can be accurately segmented and quantified. The three main components of an autofocus algorithm are a contrast function, an optimization algorithm and a sampling strategy.
T, Pengo +2 more
openaire +2 more sources
SummaryReliable autofocusing is a critical part of any automated microscopy system: by precisely positioning the sample in the focal plane, the acquired images are sharp and can be accurately segmented and quantified. The three main components of an autofocus algorithm are a contrast function, an optimization algorithm and a sampling strategy.
T, Pengo +2 more
openaire +2 more sources
SAS Autofocus Based on Phase Gradient Autofocus
2011 Fourth International Workshop on Chaos-Fractals Theories and Applications, 2011Phase gradient autofocus (PGA) is widely used in spotlight SAR autofocus with strong robustness. However, being the different nature of synthetic aperture sonar (SAS) imagery, traditional PGA algorithm usually fails to yield satisfactory result on SAS image without modification. Three measures are taken to ensure that PGA can be applied in stripmap SAS
Sanwen Zhu, Jianping Yue, Weitao Jiang
openaire +1 more source
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353), 2002
This paper describes a silicon retina that measures image sharpness. The idea is to use this sensor in the image plane of an autofocusing camera system. The chip has 25/spl times/26 pixels, each (60 /spl mu/m)/sup 2/, is fabricated on a (2.2 mm)/sup 2/ 1.2 /spl mu/m CMOS process, and consumes 100 /spl mu/A with 5 V supply.
openaire +1 more source
This paper describes a silicon retina that measures image sharpness. The idea is to use this sensor in the image plane of an autofocusing camera system. The chip has 25/spl times/26 pixels, each (60 /spl mu/m)/sup 2/, is fabricated on a (2.2 mm)/sup 2/ 1.2 /spl mu/m CMOS process, and consumes 100 /spl mu/A with 5 V supply.
openaire +1 more source
Transionospheric Autofocus for Synthetic Aperture Radar
2023 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2023This paper presents an algorithm to mitigate the distortions caused by ionospheric turbulence on SAR space images. To quote the authors: ``In the current work, we propose a new optimization-based autofocus algorithm that helps correct the turbulence-induced distortions of spaceborne SAR images''.
Mikhail Gilman, Semyon Tsynkov
openaire +2 more sources
Autofocus laser rotary encoder
Applied Optics, 1998A laser incremental encoder with autofocus operation isproposed. In the encoder, an optical read head focuses three laserbeams upon a disk with a scaling grating. The scaling grating is areflection grating for which the height difference between adjacentpixels is one quarter of the wavelength of the laser. Each of thetwo laser beams is focused onto one
Zhang, JH, Cai, Lilong
openaire +2 more sources
Smooth control of continuous autofocus
2012 19th IEEE International Conference on Image Processing, 2012For a video camera to continuously focus on a moving object in the autofocus process, accurate estimate of the in-focus lens position is required in order to avoid the so-called bouncing phenomenon that is resulted from back-and-forth lens movements around the in-focus lens position.
Dong-Chen Tsai, Homer H. Chen
openaire +1 more source
Polarimetric phase gradient autofocus
2007 IEEE International Geoscience and Remote Sensing Symposium, 2007In the past decade the use of fully polarimetric SAR (polSAR) systems has increased significantly due to their effectiveness in target classification and detection applications. While polSAR imagery has been extensively used to distinguish between different scattering mechanisms in a scene, there has been a lack of research in the exploitation of ...
MARTORELLA, MARCO +3 more
openaire +2 more sources