How to know how many pixels are a millimeter in my image?

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mirko 2024-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/2066171-how-to-know-how-many-pixels-are-a-millimeter-in-my-image

评论： mirko 2024-1-4

I got some dimensions in pixels from the image below (for example TotalArea=520000 pixels). I need to convert my dimensions from pixel to millimeters. I'm a newbie in matlab and I don't know where to start with this. I've already made the calibration with the Camera Calibrator provided by Matlab and I've obtained two folders:

CameraParameters
EstimationError

The image is the following:

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回答（1 个）

Matt J 2024-1-4

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You need to know the length in millimeters of a particular object or feature in the image to make that conversion.

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Image Analyst 2024-1-4

@DGM right. I mentioned shadows and background flattening to him in his other question but he just said I was criticizing his question and he didn't want any more help from me. Too bad. With my 45 years experience designing imaging systems and image analysis software I could have been helpful.

mirko 2024-1-4

I can't get a better image than this due to limited instrumentation. In the last hours I partially solved my problem. I got from Matlab a length of 34 mm for the external side of the CPU when the real length is 36 mm. I can accept this error. The problem is when I try to get the pins' diameter: Matlab give me a value of 16 mm but it is impossible because the real diameter is 0.9 mm. If you can help me, I can send the code I'm trying

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