{"id":832,"date":"2018-03-22T21:35:05","date_gmt":"2018-03-22T21:35:05","guid":{"rendered":"https:\/\/www.1stvision.com\/machine-vision-solutions\/?p=832"},"modified":"2018-03-26T20:05:56","modified_gmt":"2018-03-26T20:05:56","slug":"machine-vision-industrial-camera","status":"publish","type":"post","link":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2018\/03\/machine-vision-industrial-camera.html","title":{"rendered":"Which Industrial camera would you use in low light?"},"content":{"rendered":"

\"OK<\/a>Our job as imaging specialists is to help our customers make the best decisions on which industrial camera<\/a> and image sensor works best for their application.\u00a0 This is not a trivial task as there are many data points to consider, and in the end, a good image comparison test helps provide the true answer.\u00a0 In this blog post, we conduct another image sensor comparison for low light applications<\/em> testing a long time favorite e2V EV76C661<\/a> Near Infra Red (NIR) sensor to the new Sony Starvis IMX178<\/a> and Sony Pregius IMX174<\/a> image sensor using IDS Imaging cameras.<\/strong><\/span><\/a><\/p>\n

An Industrial camera<\/a><\/strong><\/span> can be easily selected based on resolution and frame rates, but image sensor performance is more challenging.\u00a0 We can collect data points from the camera EMVA1288<\/a> test results and spectral response charts, but one can not conclude on what is best for the application based on one data point.\u00a0 In many cases, several data points need to be reviewed to start making an educated decision.<\/p>\n

We started this review comparing 3 image sensors to determine which ones would perform best in low light applications.<\/p>\n

Below is a chart comparing the e2v EV76C661 NIR, Sony Starvis IMX178 and , Sony Pregius IMX174 image sensors found in the IDS Imaging UI-3240NIR,<\/a> <\/strong>UI-3880CP<\/a> <\/strong><\/span>and UI-3060CP<\/strong><\/span><\/a> cameras using EMVA1288 data to start. This provides us with accurate image sensor data to evaluate.<\/p>\n

\"image<\/a>
Table 1: Sensor comparison data<\/figcaption><\/figure>\n
\"Spectral<\/a>
Camera Spectral Response curves<\/figcaption><\/figure>\n

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We also look at the Quantum Efficiency (QE)<\/a><\/strong> curves for the sensors to see the sensor performs over the light spectrum as seen to the left.\u00a0 (As a note, QE is the conversion of photon to an electrical charge (electrons)<\/em><\/p>\n

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For this comparison, our objective is to determine which sensor will perform best in low light applications with broadband light.\u00a0 From table 1, the IMX178 has very low absolute sensitivity (abs sensitivity) with taking ~ 1 photon to help make a adequate charge, however the pixels are small (2.4um), so maybe not gather light as well as larger pixels.\u00a0 It does have the best dark noise characteristics however.\u00a0 In comparison, the e2V sensor has 9.9 photons\u00a0 for abs sensitivity (not as good as 1 photon) and has a larger pixel size (bigger is better to collect light).\u00a0 The IMX174 proves to be interesting as well with the largest pixel of 5.86um and the highest QE @ 533nm.<\/p>\n

Using the data from the spectral response curves however, helps give us more insight across the light spectrum.\u00a0 Given we are using a NIR enhanced camera<\/a>, we will have significant more conversion of light to a create a charge on the sensor across most of the light spectrum.\u00a0 In turn, we expect we’d see brighter images from the e2V NIR IDS UI-3240 NIR<\/a> camera.<\/p>\n

As a note, one more data point is to look at the pixel well depth.\u00a0 Smaller pixels will saturate faster making the image brighter, so if other variables were close, this may also be taken into consideration.<\/p>\n

As one can see, this is not trivial, but evaluating many of the data points, can give us some clues, but testing is really what it takes!\u00a0 So, lets now compare the images to see how they look.<\/p>\n

The following images were taken with the same exposure, lens + f-stop in the identical low light environment.\u00a0 In the 2nd image, the e2v image sensor in the IDS-UI-3240CP NIR<\/a> provides the brighter image as some of the data points started to indicate.\u00a0 The IDS UI-3060CP-M<\/a> (IMX174) is second best.<\/p>\n

\"\"<\/a>
IDS UI-3880CP (IMX178)<\/figcaption><\/figure>\n
\"\"<\/a>
IDS UI-3240CP NIR (e2v )<\/figcaption><\/figure>\n
\"\"<\/a>
IDS UI-3060CP-M (Sony Pregius IMX174)<\/figcaption><\/figure>\n

In low light situations, we can always add camera gain, but we pay the price of adding noise to the image.\u00a0\u00a0 Depending on the camera image sensor, some have the ability to provide more gain than others.\u00a0 This is another factor to review when considering adding gain.\u00a0 We need to also take into account read noise as this will get amplified with gain. \u00a0 Our next part of our test is to turn up the gain to see how we compare.<\/p>\n

The following set of images was taken again with the same lens + f-stop, lighting, but with gain at max for each camera.<\/p>\n

\"\"<\/a>
IDS UI-3880CP with 14.5X gain<\/figcaption><\/figure>\n
\"\"<\/a>
IDS UI-3240CP NIR with 4X gain<\/figcaption><\/figure>\n
\"\"<\/a>
IDS UI-3060CP-M with 24X gain<\/figcaption><\/figure>\n

The IDS-UI-3060CP-M<\/a> has the highest gain available, but still keeps the read noise relatively low with 6 electrons.\u00a0 This in low light WITH gain, gives us a nice image in nearly dark environments.<\/p>\n

Conclusion<\/strong>
\nWe can review the data points until we are blue in the face and they can be very confusing.\u00a0 We can however take in all the data and help make some more educated decisions on which cameras to test.\u00a0 For example in the first test, we had a good idea the NIR sensor would perform well looking a the QE curves along with other data.\u00a0 In our second test, we may have seen the UI-3060CP had 24X gain vs others still with low read noise, giving an indication, we’d have relatively clean image.<\/p>\n

In the end, 1st Vision’s<\/a><\/strong><\/span> sales engineers will help provide the needed information and help conduct testing for you!\u00a0 We spend a lot of time in our lab\u00a0 in order to provide first hand information to our customers!<\/p>\n

\"Contact<\/a><\/p>\n

1st Vision<\/strong><\/a> is the leading provider of industrial imaging components with over 100 years of combined imaging experience.\u00a0 Do not hesitate to contact us to discuss your applications!<\/a><\/strong><\/span><\/p>\n

Related Blogs<\/strong><\/p>\n

How do I sort through all the new industrial camera image sensors to make a decision? Download the sensor cheat sheet!<\/a><\/p>\n

 <\/p>\n

Just a few foot notes regarding this blog post:<\/strong><\/p>\n

Magnification of the images differs due to sensor size.\u00a0 Working distance of the cameras was kept identical in all setups and focused accordingly with distance.<\/p>\n

This topic can be very complex!\u00a0 If we were to dig in even deeper, we’d take into consideration charge convergence of the pixel which effects sensitivity aside from looking at just QE!.. That’s probably another blog post!<\/p>\n

As a reference, this image was taken with an Iphone and set to best represent what my eye viewed during our lab test.\u00a0 Note that the left container with markers was non-distinguishable to the human eye<\/p>\n

\"\"<\/a><\/p>\n

Clipart courtesy of clipartextra.com<\/pre>\n","protected":false},"excerpt":{"rendered":"
Our job as imaging specialists is to help our customers make the best decisions on which industrial camera and image sensor works best for their application.\u00a0 This is not a trivial task as there are many data points to consider, and in the end, a good image comparison test helps provide the true answer.\u00a0 In … <\/p>\n
Continue reading “Which Industrial camera would you use in low light?”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":871,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8,61],"tags":[220,225,218,256,275,239,254,226,240,278,294,279,295],"class_list":["post-832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cameras","category-tutorial","tag-1stvision_","tag-machinevision","tag-cameras","tag-computer-vision","tag-emva-1288","tag-gige-vision","tag-image-processing","tag-industrial-imaging","tag-machine-vision","tag-sony-pregius","tag-sony-pregius-174","tag-sony-starvis","tag-sony-starvis-imx178"],"yoast_head":"\nWhich industrial camera would you use in low light for machine vision?<\/title>\n<meta name=\"description\" content=\"A Machine vision industrial camera is not easily selected without careful review of the image sensor data. 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