{"id":1952,"date":"2021-09-01T13:13:00","date_gmt":"2021-09-01T17:13:00","guid":{"rendered":"https:\/\/www.1stvision.com\/machine-vision-solutions\/?p=1952"},"modified":"2021-10-13T10:34:00","modified_gmt":"2021-10-13T14:34:00","slug":"what-can-multifield-linescan-imaging-do-for-me","status":"publish","type":"post","link":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2021\/09\/what-can-multifield-linescan-imaging-do-for-me.html","title":{"rendered":"What can multifield linescan imaging do for me?"},"content":{"rendered":"\n

Multifield imaging is a new imaging technology that enables capturing multiple images simultaneously at various lighting conditions e.g. brightfield, darkfield, and backlight in a single scan. It\u2019s a variation on the concept of sequence modes. Teledyne Dalsa Linea HS<\/a> is the industry\u2019s first TDI camera capable of capturing up to three images using light sources at different wavelengths.<\/p>\n\n\n\n

OK, cool.  How does that help me?  How does it differ from other imaging methods?  What applications can it solve that couldn\u2019t be tackled before?<\/p>\n\n\n\n

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Backlight, Darkfield, and Brightfield images of same target<\/em><\/figcaption><\/figure><\/div>\n\n\n\n

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Perhaps a quick review of area scan imaging and conventional linescan imaging will help set the stage:<\/p>\n\n\n\n

Area scan cameras<\/a> are most intuitive, creating in one exposure a rectangular array of pixels corresponding to an entire scene or field of view.T hat\u2019s ideal for many types of machine vision imaging, if the target fits wholly in the field of view, and if the lighting, lens, and image processing can best achieve the desired outcome at an optimal price point.<\/p>\n\n\n\n

But linescan imaging<\/a> is sometimes a better choice, especially for continuous-flow applications, where there is no discrete start and end point, in one dimension.  Linescan systems can capture an image \u201cslice\u201d that is enough pixels wide to make effective imaging computations, and, where required, to archive those images, using fewer active pixels and reducing sensor costs compared to area scan.  Other benefits include high sensitivity and the ability to image fast moving materials without the need for expensive strobe lighting.<\/p>\n\n\n\n

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