{"id":12346,"date":"2026-02-05T21:49:47","date_gmt":"2026-02-05T20:49:47","guid":{"rendered":"https:\/\/rodervision.com\/technique-declairage-diffus-en-computer-vision\/"},"modified":"2026-05-30T12:31:47","modified_gmt":"2026-05-30T10:31:47","slug":"technique-declairage-diffus-en-computer-vision","status":"publish","type":"page","link":"https:\/\/rodervision.com\/fr\/technique-declairage-diffus-en-computer-vision\/","title":{"rendered":"Technique d&rsquo;\u00e9clairage diffus en computer vision"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\">\n<figure class=\"wp-block-image alignleft size-full coblocks-animate\" data-coblocks-animation=\"fadeIn\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"1000\" src=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?resize=1000%2C1000&#038;ssl=1\" alt=\"Illuminateurs LED pour la conception de syst\u00e8mes de vision en \u00e9clairage direct\" class=\"wp-image-5002\" style=\"object-fit:cover\" srcset=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?w=1000&amp;ssl=1 1000w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2025\/04\/configurazione_illuminazione_diretta.png?resize=120%2C120&amp;ssl=1 120w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<h3 class=\"wp-block-heading has-custom-arancio-caldo-color has-text-color has-link-color wp-elements-1cb7b476419db8ada0250458b0fa8a94\">Guide to Diffuse Illumination Techniques in Computer Vision for Glare-Free Industrial Surface Inspection and Metrology<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Explore the technical principles of diffuse illumination in computer vision. This article details how dome and tunnel lighting eliminate specular glare on reflective surfaces. Learn about Lambertian scattering, wavelength selection, and solving the camera-hole challenge to ensure robust, high-contrast images for demanding industrial automation and quality control applications.<\/p>\n<\/div>\n<\/div>\n<\/div>\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:30%\">\n<figure class=\"wp-block-image size-large is-resized has-custom-border has-lightbox\"><a href=\"https:\/\/rodervision.com\/fr\/products\/led-bar-illuminators\/illuminateurs-matriciels-a-led-serie-dl1\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=1024%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-4037\" style=\"border-width:1px;object-fit:contain;width:300px;height:300px\" srcset=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?resize=120%2C120&amp;ssl=1 120w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1.png?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:70%\">\n<h3 class=\"wp-block-heading\"><a href=\"\/products\/led-bar-illuminators\/matrix-led-illuminators-for-machine-vision-dl1-series\/\">Serie DL1<\/a><\/h3>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Profil bas<\/li>\n\n\n\n<li>Design industriel<\/li>\n\n\n\n<li>Technologie HTTM<\/li>\n\n\n\n<li>Driver int\u00e9gr\u00e9 haute stabilit\u00e9<\/li>\n\n\n\n<li>C\u00e2ble avec connecteur M8<\/li>\n\n\n\n<li>Bo\u00eetier en aluminium<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:30%\">\n<figure class=\"wp-block-image size-large is-resized has-custom-border has-lightbox\"><a href=\"https:\/\/rodervision.com\/fr\/products\/led-bar-illuminators\/led-matrix-illuminators-dl2-series\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=1024%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-4036\" style=\"border-width:1px;object-fit:contain;width:300px;height:300px\" srcset=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?resize=120%2C120&amp;ssl=1 120w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL2.png?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:70%\">\n<h3 class=\"wp-block-heading\"><a href=\"\/products\/led-bar-illuminators\/matrix-led-illuminators-for-machine-vision-dl2-series\/\">Serie DL2<\/a><\/h3>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verre de protection<\/li>\n\n\n\n<li>Design industriel<\/li>\n\n\n\n<li>Technologie HTTM<\/li>\n\n\n\n<li>Driver int\u00e9gr\u00e9 haute stabilit\u00e9<\/li>\n\n\n\n<li>C\u00e2ble avec connecteur M8<\/li>\n\n\n\n<li>Bo\u00eetier en aluminium \u00e0 robustesse \u00e9lev\u00e9e<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:30%\">\n<figure class=\"wp-block-image size-large is-resized has-custom-border has-lightbox\"><a href=\"https:\/\/rodervision.com\/fr\/products\/led-bar-illuminators\/led-illuminators-for-line-cameras-dl1l-series\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=1024%2C1024&#038;ssl=1\" alt=\"\" class=\"wp-image-4038\" style=\"border-width:1px;object-fit:cover;width:300px;height:300px\" srcset=\"https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=1024%2C1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?resize=120%2C120&amp;ssl=1 120w, https:\/\/i0.wp.com\/rodervision.com\/wp-content\/uploads\/2024\/12\/home_focus_banner_DL1L.png?w=1200&amp;ssl=1 1200w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:70%\">\n<h3 class=\"wp-block-heading\"><a href=\"\/products\/led-bar-illuminators\/led-illuminators-for-line-cameras-dl1l-series\/\">Serie DL1L<\/a><\/h3>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Longueurs jusqu&rsquo;\u00e0 3000 mm<\/li>\n\n\n\n<li>Design industriel avec barre de fixation int\u00e9gr\u00e9e<\/li>\n\n\n\n<li>Technologie HTTM<\/li>\n\n\n\n<li>Driver int\u00e9gr\u00e9 haute stabilit\u00e9<\/li>\n\n\n\n<li>C\u00e2ble avec connecteur M8<\/li>\n\n\n\n<li>Bo\u00eetier en aluminium<\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">In industrial computer vision, the most significant adversary to robust image processing is not sensor noise or algorithmic complexity, but rather <strong>uncontrolled specular reflection<\/strong>. When imaging highly reflective, curved, or multi-faceted objects\u2014such as machined metal components, foil packaging, or glass vials\u2014standard directional lighting often creates \u00ab\u00a0hot spots.\u00a0\u00bb These saturated pixels destroy local contrast and hide critical defects.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Diffuse illumination<\/strong> (also known as omnidirectional or \u00ab\u00a0cloudy day\u00a0\u00bb lighting) is the technical solution designed to provide uniform intensity across complex surfaces. By scattering light rays so that they strike the object from a multitude of angles, diffuse lighting minimizes shadows and eliminates the harsh glare that characterizes direct illumination.<\/p>\n\n<h2 class=\"wp-block-heading\">The Physics of Light Diffusion<\/h2>\n\n<p class=\"wp-block-paragraph\">To understand diffuse illumination, one must distinguish between the behavior of a light source and the behavior of the surface it strikes.<\/p>\n\n<h3 class=\"wp-block-heading\">Lambertian Scattering<\/h3>\n\n<p class=\"wp-block-paragraph\">In an ideal diffuse environment, the goal is to create a <strong>Lambertian light source<\/strong>. According to Lambert\u2019s Cosine Law, the radiant intensity observed from an ideal diffusely reflecting surface is directly proportional to the cosine of the angle $\\theta$ between the direction of the incident light and the surface normal.<\/p>\n\n<p class=\"wp-block-paragraph\">$$I = I_0 \\cos \\theta$$<\/p>\n\n<p class=\"wp-block-paragraph\">In practice, a diffuse illuminator uses a medium (typically a translucent polymer or a high-reflectance coating) to scatter incident rays. This ensures that for any given point on a non-flat object, there is a light ray arriving at the correct angle to reflect into the camera lens, regardless of the local surface normal.<\/p>\n\n<h3 class=\"wp-block-heading\">Overcoming the Specular Highlight<\/h3>\n\n<p class=\"wp-block-paragraph\">When using direct light on a polished sphere, only a tiny fraction of the surface (where the angle of incidence equals the angle of reflection toward the lens) appears bright. The rest remains dark. Diffuse lighting surrounds the sphere with a \u00ab\u00a0field of light,\u00a0\u00bb ensuring that the entire geometry is illuminated evenly.<\/p>\n\n<h2 class=\"wp-block-heading\">Core Diffuse Lighting Architectures<\/h2>\n\n<p class=\"wp-block-paragraph\">Professional vision systems utilize several distinct geometries to achieve diffusion, each suited to specific mechanical constraints and inspection goals.<\/p>\n\n<h3 class=\"wp-block-heading\">A. Dome (Hemispherical) Illumination<\/h3>\n\n<p class=\"wp-block-paragraph\">Dome lights are the \u00ab\u00a0gold standard\u00a0\u00bb for diffuse lighting. The interior of the dome is coated with a highly reflective, matte white material. LEDs are typically mounted at the base, pointing upward into the dome.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Mechanism:<\/strong> Light bounces off the interior walls multiple times before reaching the object.<\/li>\n\n\n\n<li><strong>Best for:<\/strong> Highly specular, curved surfaces like ball bearings, chrome-plated parts, or convex packaging.<\/li>\n\n\n\n<li><strong>The \u00ab\u00a0Camera Hole\u00a0\u00bb Challenge:<\/strong> Because the camera must look through a hole at the top of the dome, there is often a dark spot in the center of the image. This is frequently mitigated by combining a dome light with a coaxial light.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">B. Flat Diffuse (Area) Lighting<\/h3>\n\n<p class=\"wp-block-paragraph\">A flat diffuse light consists of an LED array behind a specialized diffuser plate. Unlike standard area lights, the diffuser is engineered to provide high uniformity at close range.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Use Case:<\/strong> Inspection of flat but somewhat reflective surfaces, such as PCBs or semi-matte plastics.<\/li>\n\n\n\n<li><strong>Pro Tip:<\/strong> To maximize diffusion, the light should be placed as close to the object as possible. As the distance increases, the \u00ab\u00a0angular size\u00a0\u00bb of the light source decreases, and it begins to behave more like a point source (direct light).<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">C. Cloudy Day (Cylindrical\/Tunnel) Lighting<\/h3>\n\n<p class=\"wp-block-paragraph\">For long, continuous objects (like wires, tubes, or extrusions), a cylindrical or \u00ab\u00a0tunnel\u00a0\u00bb diffuse light is used. It provides 360-degree wrap-around illumination along the axis of travel.<\/p>\n\n<h3 class=\"wp-block-heading\">D. Coaxial Diffuse Illumination<\/h3>\n\n<p class=\"wp-block-paragraph\">This technique uses a beam splitter to fold the light path so that it is parallel to the optical axis. When combined with a diffuser, it allows for shadow-less illumination of flat, mirror-like surfaces.<\/p>\n\n<h2 class=\"wp-block-heading\">Wavelength and Material Interaction<\/h2>\n\n<p class=\"wp-block-paragraph\">The choice of wavelength in diffuse lighting is not merely a matter of color, but of material interaction and sensor efficiency.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Longueur d&rsquo;onde<\/strong><\/td><td><strong>Application<\/strong><\/td><td><strong>Benefit<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>White (Broadband)<\/strong><\/td><td>General purpose<\/td><td>Best for color inspection and multi-colored parts.<\/td><\/tr><tr><td><strong>Red (630 nm)<\/strong><\/td><td>Standard industrial<\/td><td>High efficiency, long LED life, excellent for monochrome sensors.<\/td><\/tr><tr><td><strong>Blue (470 nm)<\/strong><\/td><td>Precision \/ High Res<\/td><td>Shorter wavelength reduces diffraction; reveals finer surface scratches.<\/td><\/tr><tr><td><strong>Infrared (850 nm)<\/strong><\/td><td>Through-plastic<\/td><td>Penetrates certain dyes and reduces visual \u00ab\u00a0clutter\u00a0\u00bb from printed labels.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\">Spectral Diffusion<\/h3>\n\n<p class=\"wp-block-paragraph\">It is important to note that some diffuser materials are wavelength-dependent. A diffuser optimized for visible light may become \u00ab\u00a0transparent\u00a0\u00bb to Infrared (IR) radiation, causing the light to lose its diffuse properties. Always verify that the diffuser material is rated for the specific wavelength in use.<\/p>\n\n<h2 class=\"wp-block-heading\">Solving the \u00ab\u00a0Camera Hole\u00a0\u00bb Problem<\/h2>\n\n<p class=\"wp-block-paragraph\">As mentioned, the physical aperture required for the camera lens in a dome light creates a \u00ab\u00a0non-illuminated\u00a0\u00bb zone. In professional metrology, this can lead to a dark reflection in the center of a polished part.<\/p>\n\n<p class=\"wp-block-paragraph\">To solve this, engineers use <strong>Combined Geometry<\/strong>:<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>A <strong>Dome Light<\/strong> provides the wide-angle diffuse field.<\/li>\n\n\n\n<li>A <strong>Coaxial Light<\/strong> is mounted above the dome, \u00ab\u00a0filling\u00a0\u00bb the camera hole with on-axis diffuse light.<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\">This hybrid approach creates a truly seamless $180^{\\circ}$ illumination field, which is essential for inspecting the top surfaces of highly reflective cylinders or spheres.<\/p>\n\n<h2 class=\"wp-block-heading\">Integration Challenges: Intensity vs. Uniformity<\/h2>\n\n<p class=\"wp-block-paragraph\">The primary trade-off in diffuse lighting is <strong>efficiency<\/strong>. By scattering light and bouncing it off internal surfaces, a significant amount of energy is lost compared to a direct LED ring light.<\/p>\n\n<h3 class=\"wp-block-heading\">Managing Light Loss<\/h3>\n\n<ul class=\"wp-block-list\">\n<li><strong>Strobing\/Overdriving:<\/strong> To compensate for the loss of photons, diffuse lights are almost always used in a pulsed (strobed) mode. By overdriving the LEDs for a few milliseconds, you can achieve the necessary brightness for high-speed shutters without damaging the light.<\/li>\n\n\n\n<li><strong>Lens Aperture:<\/strong> Because diffuse light is \u00ab\u00a0soft,\u00a0\u00bb you may need to open the lens aperture (lower f-number). However, be mindful that this reduces the <strong>Depth of Field (DoF)<\/strong>.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Distance and the \u00ab\u00a0Inverse Square\u00a0\u00bb Myth<\/h3>\n\n<p class=\"wp-block-paragraph\">While the Inverse Square Law ($1\/r^2$) applies to point sources, diffuse dome lights behave differently. Within the \u00ab\u00a0working volume\u00a0\u00bb of a dome light, the intensity remains relatively constant. However, if the object moves too far from the dome&rsquo;s opening, the uniformity drops drastically as ambient light and directional rays take over.<\/p>\n\n<h2 class=\"wp-block-heading\">Software Advantages of Diffuse Light<\/h2>\n\n<p class=\"wp-block-paragraph\">From an image processing perspective, diffuse illumination simplifies the life of the developer.<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Histogram Normalization:<\/strong> Diffuse lighting tends to produce a \u00ab\u00a0tighter\u00a0\u00bb histogram. Without the extreme peaks of specular highlights, the software can utilize the full dynamic range of the sensor to distinguish subtle grayscale variations.<\/li>\n\n\n\n<li><strong>Robust Edge Detection:<\/strong> In direct light, an edge might be \u00ab\u00a0lost\u00a0\u00bb in a glare. In diffuse light, the transition from object to background is smooth and predictable, which is vital for <strong>sub-pixel interpolation<\/strong> algorithms.<\/li>\n\n\n\n<li><strong>Blob Analysis:<\/strong> For detecting contaminants or defects on shiny surfaces, diffuse light ensures that the \u00ab\u00a0blob\u00a0\u00bb detected is the actual defect, not a phantom reflection of the light source.<\/li>\n<\/ol>\n\n<h2 class=\"wp-block-heading\">When to Avoid Diffuse Illumination<\/h2>\n\n<p class=\"wp-block-paragraph\">While highly effective, diffuse lighting is not a panacea:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Space Constraints:<\/strong> Dome lights are physically bulky. They may not fit in tight machine footprints.<\/li>\n\n\n\n<li><strong>Surface Topography:<\/strong> If the goal is to <em>highlight<\/em> a scratch or an etched code, diffuse light might be \u00ab\u00a0too good\u00a0\u00bb\u2014it can wash out the very texture you are trying to find. In those cases, <strong>Darkfield<\/strong> (low-angle) lighting is superior.<\/li>\n\n\n\n<li><strong>Cost:<\/strong> Due to the complexity of the housing and the volume of LEDs required to overcome scattering losses, diffuse lights are generally more expensive than direct alternatives.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n<p class=\"wp-block-paragraph\">Diffuse illumination is the essential technique for taming the \u00ab\u00a0specular chaos\u00a0\u00bb of industrial environments. By understanding the geometry of domes, the physics of Lambertian scattering, and the strategic use of coaxial fills, vision professionals can create systems that are immune to glare and orientation-based intensity shifts.<\/p>\n\n<p class=\"wp-block-paragraph\">In the pursuit of zero-defect manufacturing, the ability to see a part \u00ab\u00a0as it truly is\u00a0\u00bb\u2014without the distraction of reflections\u2014is the foundation of a successful computer vision deployment.<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Caract\u00e9ristique<\/strong><\/td><td><strong>R\u00e9tro\u00e9clairage<\/strong><\/td><td><strong>\u00c9clairage direct<\/strong><\/td><td><strong>\u00c9clairage diffus<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Direction de la lumi\u00e8re<\/strong><\/td><td>Derri\u00e8re l&rsquo;objet<\/td><td>Avant\/c\u00f4t\u00e9 de l&rsquo;objet<\/td><td>Omnidirectionnel \/ diffus<\/td><\/tr><tr><td><strong>Objectif principal<\/strong><\/td><td>Silhouette &amp; G\u00e9om\u00e9trie<\/td><td>D\u00e9tails de surface &amp; Couleur<\/td><td>Suppression des reflets et ombres<\/td><\/tr><tr><td><strong>Id\u00e9al pour<\/strong><\/td><td>M\u00e9trologie, inspection de trous<\/td><td>Codes-barres, texture, rayures<\/td><td>Pi\u00e8ces brillantes, courb\u00e9es ou m\u00e9talliques<\/td><\/tr><tr><td><strong>Avantage cl\u00e9<\/strong><\/td><td>Contraste maximal des bords<\/td><td>Extraction de d\u00e9tails fins<\/td><td>\u00c9limine les \u00ab\u00a0hot spots\u00a0\u00bb (reflets)<\/td><\/tr><tr><td><strong>D\u00e9fi principal<\/strong><\/td><td>N\u00e9cessite un acc\u00e8s des 2 c\u00f4t\u00e9s<\/td><td>Gestion des reflets sp\u00e9culaires<\/td><td>Encombrement physique (d\u00f4me) &amp; intensit\u00e9<\/td><\/tr><tr><td><strong>Optique id\u00e9ale<\/strong><\/td><td>Optiques t\u00e9l\u00e9centriques<\/td><td>Optiques standard \/ macro<\/td><td>Optiques standard \/ grand angle<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Guide to Diffuse Illumination Techniques in Computer Vision for Glare-Free Industrial Surface Inspection and Metrology Explore the technical principles of diffuse illumination in computer vision. This article details how dome and tunnel lighting eliminate specular glare on reflective surfaces. Learn about Lambertian scattering, wavelength selection, and solving the camera-hole challenge to ensure robust, high-contrast images [&hellip;]<\/p>\n","protected":false},"author":157040980,"featured_media":12347,"parent":0,"menu_order":9,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"footnotes":""},"class_list":["post-12346","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Diffuse illumination in computer vision<\/title>\n<meta name=\"description\" content=\"Diffuse illumination with flat dome or circular illuminators can improve efficiency of machine vision systems.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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