{"id":3051,"date":"2023-05-16T11:32:05","date_gmt":"2023-05-16T15:32:05","guid":{"rendered":"https:\/\/www.1stvision.com\/machine-vision-solutions\/?p=3051"},"modified":"2023-05-18T13:00:57","modified_gmt":"2023-05-18T17:00:57","slug":"machine-vision-lights-as-important-as-sensors-and-optics","status":"publish","type":"post","link":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2023\/05\/machine-vision-lights-as-important-as-sensors-and-optics.html","title":{"rendered":"Machine vision lights as important as sensors and optics"},"content":{"rendered":"\n<p>Lighting matters as much or more than camera (sensor) selection and optics (lensing).  A sensor and lens that are &#8220;good enough&#8221;, when used with good lighting, are often all one needs.  Conversely, a superior sensor and lens, with poor lighting, can underperform.  Read further for clear examples why machine vision lights are as important as sensors and optics!<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"430\" height=\"270\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/AdvancedIlluminationCollage.jpg\" alt=\"\" class=\"wp-image-3137\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/AdvancedIlluminationCollage.jpg 430w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/AdvancedIlluminationCollage-300x188.jpg 300w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><figcaption class=\"wp-element-caption\">Assorted white and color LED lights &#8211; courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Why is lighting so important?  <strong>Contrast is essential<\/strong> for human vision and machine vision alike.  Nighttime hiking isn&#8217;t very popular &#8211; for a reason &#8211; it&#8217;s not safe and it&#8217;s no fun if one can&#8217;t see rocks, roots, or vistas.  In machine vision, for the software to interpret the image, one first has to obtain a good image.  And a good image is one with maximum contrast &#8211; such that photons corresponding to real-world coordinates are saturated, not-saturated, or &#8220;in between&#8221;, with the best spread of intensity achievable.<\/p>\n\n\n\n<p>Only with contrast can one detect edges, identify features, and effectively interpret an image.  Choosing a camera with a good sensor is important.   So is an appropriately matched lens.  But just as important is good lighting, well-aligned &#8211; to set up your application for success.<\/p>\n\n\n\n<p><strong>What&#8217;s the best light source?<\/strong>  Unless you can count on the sun or ambient lighting, or have no other option, one may choose from various potential types of light:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fluorescent<\/li>\n\n\n\n<li>Quartz Halogen \u2013 Fiber Optics<\/li>\n\n\n\n<li>LED &#8211; Light Emitting Diode<\/li>\n\n\n\n<li>Metal Halide (Mercury)<\/li>\n\n\n\n<li>Xenon (Strobe)<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"605\" height=\"341\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Comparing-Light-Sources.jpg\" alt=\"\" class=\"wp-image-3070\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Comparing-Light-Sources.jpg 605w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Comparing-Light-Sources-300x169.jpg 300w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>By far the most popular light source is LED, as it is affordable, available in diverse wavelengths and shapes (bar lights, ring lights, etc.), stable, long-life, and checks most of the key boxes.  <\/p>\n\n\n\n<p>The other light types each have their place, but those places are more specialized.  For comprehensive treatment of the topics summarized here, see &#8220;A Practical Guide to Machine Vision Lighting&#8221; in our Knowledgebase, courtesy of Advanced Illumination.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.1stvision.com\/knowledgebase2\/48\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\"><img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"90\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper.jpg\" alt=\"Download whitepaper\" class=\"wp-image-1846\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper.jpg 390w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper-300x69.jpg 300w\" sizes=\"auto, (max-width: 390px) 100vw, 390px\" \/><\/a><figcaption class=\"wp-element-caption\">Download whitepaper<\/figcaption><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Lighting geometry and techniques:<\/strong>  There&#8217;s a tendency among newcomers to machine vision lighting to underestimate lighting design for an application.  Buying an LED and lighting up the target may fill up sensor pixel wells, but not all images are equally useful.  Consider images (b) and (c) below &#8211; the bar code in (c) shows high contrast between the black bars and the white field.  Image (b) is somewhere between unusable or marginally usable, with reflection obscuring portions of the target, and portions of the (should be) white field appearing more grey than white.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"652\" height=\"270\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/BrightFieldDarkField.jpg\" alt=\"\" class=\"wp-image-3064\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/BrightFieldDarkField.jpg 652w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/BrightFieldDarkField-300x124.jpg 300w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>As shown in diagram (a) of Figure 22 above, understanding bright field vs dark field concepts, as well as the specular qualities of the surface being imaged, can lead to radically different outcomes.  A little bit of lighting theory &#8211; together with some experimentation and tuning, is well worth the effort. <\/p>\n\n\n\n<p>Now for a more complex example &#8211; below we could characterize images (a), (b), (c) and (d) as poor, marginal, good, and superior, respectively.  Component cost is invariant, but the outcomes are sure different!<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"665\" height=\"449\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/LightingGeometryPoorBetterBest.jpg\" alt=\"\" class=\"wp-image-3073\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/LightingGeometryPoorBetterBest.jpg 665w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/LightingGeometryPoorBetterBest-300x203.jpg 300w\" sizes=\"auto, (max-width: 665px) 100vw, 665px\" \/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>To learn more, <a href=\"https:\/\/www.1stvision.com\/knowledgebase2\/48\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">download the whitepaper<\/a> or call us at (978) 474-0044. <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/www.1stvision.com\/contactForm?siq_name=$[FNAME]$$[LNAME]$&amp;siq_email=$[EMAIL]$\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/05\/Contact-Us-1.jpg\" alt=\"Contact us\" class=\"wp-image-1866\" width=\"165\" height=\"39\"\/><\/a><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Color light<\/strong> &#8211; above we showed monochrome examples &#8211; black and white&#8230; and grey levels in between.   Many machine vision applications are in fact best addressed in the monochrome space, with no benefit from using color.  But understanding what surfaces will reflect or absorb certain wavelengths is crucial to optimizing outcomes &#8211; regardless of whether working in monochrome, color, infrared (IR), or ultraviolet (UV).  <\/p>\n\n\n\n<p>Beating the same drum throughout, it&#8217;s about maximizing contrast.  Consider the color wheel shown below.  The most contrast is generated by taking advantage of opposing colors on the wheel.  For example, green light best suppresses red reflection.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"190\" height=\"227\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/ColorWheel.jpg\" alt=\"\" class=\"wp-image-3075\"\/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>On can use actual color light sources, or white light together with well-chosen wavelength &#8220;pass&#8221; or &#8220;block&#8221; filters.  This is nicely illustrated in Fig. 36 below.  Take a moment to correlate the configurations used for each of images (a) &#8211; (f), relative to the color wheel above.  Depending on one&#8217;s application goals, sometimes there are several possible combinations of sensor, lighting, and filters to achieve the desired result. <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"644\" height=\"427\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Color.jpg\" alt=\"\" class=\"wp-image-3062\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Color.jpg 644w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Color-300x199.jpg 300w\" sizes=\"auto, (max-width: 644px) 100vw, 644px\" \/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Filters \u2013 can help.<\/strong>  Consider images (a) and (b) in Fig. 63 below.   The same plastic 6-pack holder shown is shown in both images, but only the image in figure (b) reveals stress fields that, were the product to be shipped, might cause dropped product, reduced consumer confidence in one&#8217;s brand.   By designing in polarizing filters, this can be the basis for a value-added application, automating quality control in a way that might not have been otherwise achievable &#8211; or not at such a low cost.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"183\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Filters.png\" alt=\"\" class=\"wp-image-3061\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Filters.png 640w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2023\/05\/Filters-300x86.png 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><figcaption class=\"wp-element-caption\">Courtesy of Advanced Illumination<\/figcaption><\/figure>\n<\/div>\n\n\n<p>For more comprehensive treatment of filter applications, see either or both Knowledgebase documents:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.1stvision.com\/knowledgebase2\/210\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">Enhance Contrast with Monochrome Filters<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.1stvision.com\/knowledgebase2\/209\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">Enhance Contrast with Color Filters<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Powering the lights<\/strong> &#8211; should the be voltage-driven or current-driven?  How are LEDs powered?  When to strobe vs running in continuous modes?  How to integrate light controller with the camera and software.  These are all worth understanding &#8211; or having someone in your team &#8211; whether in-house or a trusted partner &#8211; who does.<\/p>\n\n\n\n<p>For comprehensive treatment of the topics summarized here, see Advanced Illumination&#8217;s  &#8220;A Practical Guide to Machine Vision Lighting&#8221; in our Knowledgebase:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.1stvision.com\/knowledgebase2\/48\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\"><img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"90\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper.jpg\" alt=\"Download whitepaper\" class=\"wp-image-1846\" srcset=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper.jpg 390w, https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/04\/RED-Download-Whitepaper-300x69.jpg 300w\" sizes=\"auto, (max-width: 390px) 100vw, 390px\" \/><\/a><figcaption class=\"wp-element-caption\">Download whitepaper<\/figcaption><\/figure>\n<\/div>\n\n\n<p>This blog is intended to whet the appetite for interest in lighting &#8211; but it only skims the surface.  Machine vision lights as important as sensors and optics.  Please download the guide linked just above &#8211; to deepen your knowledge.  Or if you want help with a specific application, you may draw on the experience of our sales engineers and trusted partners.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/www.1stvision.com\/contactForm?siq_name=$[FNAME]$$[LNAME]$&amp;siq_email=$[EMAIL]$\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"173\" height=\"41\" src=\"https:\/\/www.1stvision.com\/machine-vision-solutions\/wp-content\/uploads\/2021\/05\/Contact-Us-1.jpg\" alt=\"\" class=\"wp-image-1866\"\/><\/a><\/figure>\n<\/div>\n\n\n<p><a href=\"https:\/\/www.1stvision.com\/?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>1st Vision\u2019s<\/strong><\/a>&nbsp;sales engineers have over 100 years of combined experience to assist in your camera and components selection.&nbsp; With a large portfolio of&nbsp;<a href=\"https:\/\/www.1stvision.com\/lens\/machine-vision-lenses?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">lenses<\/a>,&nbsp;<a href=\"https:\/\/www.1stvision.com\/cameras\/accessories\/Data-cables?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">cables<\/a>,&nbsp;<a href=\"https:\/\/www.1stvision.com\/cameras\/accessories\/NIC-cards?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">NIC card<\/a>&nbsp;and&nbsp;<a href=\"https:\/\/www.1stvision.com\/1stvision-industrial-computer-systems\/embedded-industrial-computer?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">industrial computers<\/a>, we can provide a<mark>&nbsp;<a href=\"https:\/\/www.1stvision.com\/components-needed-for-machine-vision-and-industrial-imaging-systems?siq_name=$%5bFNAME%5d$%20$%5bLNAME%5d$&amp;siq_email=$%5bEMAIL%5d$\" target=\"_blank\" rel=\"noreferrer noopener\">full vision solution!<\/a><\/mark><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lighting matters as much or more than camera (sensor) selection and optics (lensing).  A sensor and lens that are &#8220;good enough&#8221;, when used with good lighting, are often all one needs.  Conversely, a superior sensor and lens, with poor lighting, can underperform.  Do not cut corners on lighting.<\/p>\n","protected":false},"author":10,"featured_media":3139,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[109,61,104],"tags":[],"class_list":["post-3051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lighting","category-tutorial","category-white-paper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Machine vision lights as important as sensors and optics<\/title>\n<meta name=\"description\" content=\"Machine vision lights are as important as sensors and optics\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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