Color image acquisition by charge‐coupled device cameras in polychromatic pattern recognition

1996 ◽  
Vol 35 (3) ◽  
pp. 754 ◽  
Author(s):  
Montse Corbala´n
Keyword(s):  
Pattern Recognition ◽  
Color Image ◽  
Image Acquisition ◽  
Charge Coupled Device

scholarly journals Color image acquisition using a monochrome camera and standard fluorescence filter cubes

BioTechniques ◽  
2005 ◽  
Vol 38 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Gregory F. Weber ◽  
A. Sue Menko
Keyword(s):  
Color Image ◽  
Image Acquisition

scholarly journals The Method of Automatic Knuckle Image Acquisition for Continuous Verification Systems

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 624
Author(s):  
Rafal Doroz
Keyword(s):  
Pattern Recognition ◽  
Image Acquisition ◽  
Test Results ◽  
High Effectiveness ◽  
Camera Image ◽  
Automatic Location ◽  
Pattern Recognition Approach ◽  
Computer Keyboard ◽  
Verification Systems ◽  
Acquisition Method

The paper proposes a method of automatic knuckle image acquisition for continuous verification systems. The developed acquisition method is dedicated for verification systems in which the person being verified uses a computer keyboard. This manner of acquisition enables registration of the knuckle image without interrupting the user’s work for the time of acquisition. This is an important advantage, unprecedented in the currently known methods. The process of the automatic location of the finger knuckle can be considered as a pattern recognition approach and is based on the analysis of symmetry and similarity between the reference knuckle patterns and live camera image. The effectiveness of the aforesaid approach has been tested experimentally. The test results confirmed its high effectiveness. The effectiveness of the proposed method was also determined in a case where it is a part of a multi-biometric method.

scholarly journals In Situ Image Acquisition and Measurement of Microdroplets Based on Delay Triggering

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 148
Author(s):  
Xuefeng Chang ◽  
Kang Zheng ◽  
Dan Xie ◽  
Xiayun Shu ◽  
Keyu Xu ◽  
...  
Keyword(s):  
Light Source ◽  
Delay Time ◽  
Imaging System ◽  
Image Acquisition ◽  
Ccd Camera ◽  
Time Interval ◽  
Charge Coupled Device ◽  
Drop On Demand ◽  
Relative Standard

An in situ image acquisition apparatus based on delay triggering for visualizing microdroplets formation is described. The imaging system includes a charge-coupled device camera, a motion control card, a driving circuit, a time delay triggering circuit, and a light source. By adjusting the varying trigger delay time which is synchronized with respect to the signal for jetting, the steady sequential images of the droplet flying in free space can be captured real-time by the system. Several image processing steps are taken to measure the diameters and coordinates of the droplets. Also, the jetting speeds can be calculated according to the delay time interval. For glycerin/water (60:40, mass ratio), under the given conditions of the self-made pneumatically diaphragm-driven drop-on-demand inkjet apparatus, the average of diameter and volume are measured as 266.8 μm and 9944 pL, respectively, and the maximum average velocity of the microdroplets is 0.689 m/s. Finally, the imaging system is applied to measure the volume of 200 microsolder balls generated from the inkjet apparatus. The average diameter is 87.96 μm, and the relative standard deviation is 0.83%. The results show good reproducibility. Unlike previous stroboscopic techniques, the present in situ imaging system which is absence of instantaneous high intensity light employs two control signals to stimulate the microdroplet generator and the charge-coupled device (CCD) camera. Hence, the system can avoid the desynchronization problem of signals which control the strobe light-emitting diode (LED) light source and the camera in previous equipment. This technology is a reliable and cost-effective approach for capturing and measuring microdroplets.

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