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Image data transport: from pixel to PC by CoaXPress Part 1

Posted by Benny Koene on Fri, Aug 19, 2016

Translating data rate and frame rate

Before an image from a vision system can be stored or processed in a host computer, it already has passed several other processing and transport steps. In this two part article we will clarify the data flow and show you how you can get an estimate how the data rate correlates with the frame rate. We will also provide some tips on how to discover the data rate limiting factor in your vision system.

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Topics: Vision System Optimization, Interface Technology, Sensor Technology

Moving from CCD to CMOS daylight cameras in global security systems

Posted by Gretchen Alper on Wed, May 25, 2016

There is a move from CCD to CMOS daylight cameras in global security systems with the increase in low light performance (better NIR sensitivity and lower noise) of the latest CMOS global shutter image sensors. Here are several articles that offer some tips on how to take advantage of the latest technology:

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Topics: Sensor Technology

What will EMVA1288 data tell you and what it won’t

Posted by Gretchen Alper on Fri, Mar 18, 2016

When a system designer identifies a need for a component, such as a camera, the first step is of course a website search.  The initial search may include basics such as by desired resolution, interface, and frame speed.  The next way to narrow down the selection would be by imaging performance criteria such as signal to noise ratio, quantum efficiency, temporal dark noise, and more.  The problem was that the values reported from these specifications depended on the testing conditions and the settings can be optimized to provide best possible results. 

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Topics: Sensor Technology

Top 5 predictions for the future in machine vision

Posted by Gretchen Alper on Thu, Aug 13, 2015

If you are redesinging a vision system, or thinking aobut a new industiral vision it is good to know what is coming next. Here are some of our thoughts on where we think image sensor technology will continue to go as well as the supporting image processing, optics, and interfaces.

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Topics: Sensor Technology

Binning to increase SNR and frame rate with CCD and CMOS industrial cameras

Posted by Gretchen Alper on Wed, Jan 15, 2014

There are always small changes (at no additional product cost) that can be made to increase the performance of your machine vision camera and thus to your overall inspection or metrology system.  Binning is one example.  There has been a trend with latest generation image sensors to increase resolution while also reducing the pixel size at the expense of some other performance parameters. If you do not need all of the resolution provided, but require better signal to noise ratio for instance, then binning is an easy solution.  Here we will discuss binning with CCD cameras (interline transfer image sensor technology).  For more information on binning with CMOS cameras, please see a previous post.

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Topics: Vision System Optimization, Sensor Technology

Small Pixels and CCD versus CMOS update for global security and industrial imaging applications

Posted by Gretchen Alper on Tue, Sep 17, 2013

There is a lot of buzz about the improved camera that will be available in the iPhone 5S released this month.  One of the surprising announcements from Apple was the increase in pixel size from 1.4um to 1.5um and the statement “bigger pixels = better picture.” This got us thinking about a topic we previously discussed in detail about why cameras for consumer electronic products are not used for machine vision or global security applications. 

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Topics: Sensor Technology

2/3” vs. 1/2” vs. 1/3” Full-HD image sensor size for global security applications

Posted by Gretchen Alper on Thu, Sep 5, 2013

In theory, bigger pixels on full-HD CCD image sensors are better for global security applications because they are more sensitive for improved low light performance.  The drawback is that bigger optics are required so size, weight, power, and cost (SWaP-C) requirements are challenged.  As many systems are upgrading from standard definition to full-HD cameras or adding HD daylight cameras for full motion video, the question is how to find the optimal balance.

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Topics: Sensor Technology, CCD vs. CMOS

Bayer Area Scan Color Cameras compared to 3-CCD Color Cameras, part 1

Posted by Gretchen Alper on Tue, May 14, 2013

There is a perception that color precision can only be achieved with 3-chip prism-based (3-CCD, multiple-chip prism, etc.) video cameras.  Because of advances in sensor design, knowledgeable camera designers can now get excellent color images from Bayer patterned image sensors.  These images are so good that all consumer digital SLR cameras use a single chip sensor configuration. 

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Topics: Sensor Technology

How to measure the Photon Transfer Curve for CCD or CMOS cameras (2)

Posted by Gretchen Alper on Wed, Jan 23, 2013

This is a repost of a wonderful blog written by Albert Theuwissen on his blog (Harvest Imaging) that we thought might be helpful for those testing and evaluating CCD or CMOS machine vision cameras.

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Topics: Vision System Optimization, Sensor Technology

How to measure the Photon Transfer Curve for CCD or CMOS cameras

Posted by Gretchen Alper on Tue, Jan 22, 2013

This is a repost of a wonderful blog written by Albert Theuwissen on his blog (Harvest Imaging) that we thought might be helpful for those testing and evaluating CCD or CMOS machine vision cameras.

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Topics: Vision System Optimization, Sensor Technology