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Vision Systems Questions
I am a concrete construction quality professional active in many industry associations, but I know very little about image capture and analysis. I am looking for a combination of hardware and software to measure voids in concrete surfaces after the formwork is removed. Our industry currently has only subjective measurement of surface to void ratios and color uniformity; both important aesthetic attributes. I would like to build a device to capture images under controlled lighting and reflectance, and then use software to determine void / surface ratio and color uniformity. Several white papers have been written on this subject using Matlab or ImageJ for analysis of greyscale images, but the devil appears to be in the details - controlling variables.
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John - This sounds like an interesting problem that would likely need an engineered solution. Would the end goal to be to get to a handheld unit an operator could use in field or would this unit analyze specimens taken to a lab. To do accurate color analysis we'll want to use full spectrum white light. For the voids a low angle of light could be best as that's typically used to pick up scratches, dents and other non-uniformities in surfaces. We'd probably also need to come up with a calibration to make sure we're providing consistent readings over time. Happy to discuss further. These are always interesting problems to talk through. Send me an email or call at 303-832-1111x101.
John, You are correct the devil is in the details. How large a surface would you want to inspect at a time, and is it always out doors (poured in place) or is this inside of a plant. We have done some work with other construction companies in a factory environment, where the end user has labelled and defined the defects, by pointing and clicking - this uses deep learning techniques not traditional machine learning, just due to the large variation that I'm sure you've seen. Please feel free to contact us, and send some samples, so we can do an initial vision study for you. If it gives good results great, if it doesn't then you'll know that's not the technology for you. Andy
Hi John, that sounds interesting. We develop machine vision solutions, and have previous experience inspecting concrete blocks. I know that's different, but perhaps not too different. I'd be happy to discuss this with you in detail.