scholarly journals Visualizing the lightning flashes over the Republic of Azerbaijan by analyzing the lightning imaging sensor data

Author(s):  
R. Mammadov ◽  
◽  
A.A. Rasouli ◽  
S. Safarov ◽  
E. Safarov ◽  
...  

2010 ◽  
Vol 2 (3) ◽  
pp. 28-42 ◽  
Author(s):  
H. R. Chennamma ◽  
Lalitha Rangarajan

A digitally developed image is a viewable image (TIFF/JPG) produced by a camera’s sensor data (raw image) using computer software tools. Such images might use different colour space, demosaicing algorithms or by different post processing parameter settings which are not the one coded in the source camera. In this regard, the most reliable method of source camera identification is linking the given image with the sensor of camera. In this paper, the authors propose a novel approach for camera identification based on sensor’s readout noise. Readout noise is an important intrinsic characteristic of a digital imaging sensor (CCD or CMOS) and it cannot be removed. This paper quantitatively measures readout noise of the sensor from an image using the mean-standard deviation plot, while in order to evaluate the performance of the proposed approach, the authors tested against the images captured at two different exposure levels. Results show datasets containing 1200 images acquired from six different cameras of three different brands. The success of proposed method is corroborated through experiments.



Author(s):  
Tomohiro Umetani ◽  
Naomichi Kuga ◽  
Masahiro Tanaka ◽  
Masahiro Wada ◽  
Minoru Ito


Author(s):  
H. R. Chennamma ◽  
Lalitha Rangarajan

A digitally developed image is a viewable image (TIFF/JPG) produced by a camera’s sensor data (raw image) using computer software tools. Such images might use different colour space, demosaicing algorithms or by different post processing parameter settings which are not the one coded in the source camera. In this regard, the most reliable method of source camera identification is linking the given image with the sensor of camera. In this paper, the authors propose a novel approach for camera identification based on sensor’s readout noise. Readout noise is an important intrinsic characteristic of a digital imaging sensor (CCD or CMOS) and it cannot be removed. This paper quantitatively measures readout noise of the sensor from an image using the mean-standard deviation plot, while in order to evaluate the performance of the proposed approach, the authors tested against the images captured at two different exposure levels. Results show datasets containing 1200 images acquired from six different cameras of three different brands. The success of proposed method is corroborated through experiments.



Author(s):  
E. Theunissen ◽  
F.D. Roefs ◽  
G.J.M. Koeners ◽  
R.M. Rademaker ◽  
T.J. Etherington


2019 ◽  
Vol 55 (17) ◽  
pp. 928-931
Author(s):  
Feri Setiawan ◽  
Bernardo Nugroho Yahya ◽  
Seok‐Lyong Lee


Author(s):  
Alexander I. Linn ◽  
Alexander K. Zeller ◽  
Erhard E. Pfündel ◽  
Roland Gerhards

Abstract Most non-destructive methods for plant stress detection do not measure the primary stress response but reactions of processes downstream of primary events. For instance, the chlorophyll fluorescence ratio Fv/Fm, which indicates the maximum quantum yield of photosystem II, can be employed to monitor stress originating elsewhere in the plant cell. This article describes the properties of a sensor to quantify herbicide and pathogen stress in agricultural plants for field applications by the Fv/Fm parameter. This dedicated sensor is highly mobile and measures images of pulse amplitude modulated (PAM) chlorophyll fluorescence. Special physical properties of the sensor are reported, and the range of its field applications is defined. In addition, detection of herbicide resistant weeds by employing an Fv/Fm-based classifier is described. The PAM-imaging sensor introduced here can provide in-field estimation of herbicide sensitivity in crops and weeds after herbicide treatment before any damage becomes visible. Limitations of the system and the use of a classifier to differentiate between stressed and non-stressed plants based on sensor data are presented. It is concluded that stress detection by the Fv/Fm parameter is suitable as an expert tool for decision making in crop management.



1996 ◽  
Vol 35 (3) ◽  
pp. 659 ◽  
Author(s):  
Jay Brent Romine


2008 ◽  
Author(s):  
Daniele Biron ◽  
Luigi De Leonibus ◽  
Paolo Laquale ◽  
Demetrio Labate ◽  
Francesco Zauli ◽  
...  


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