Linked Questions

5 votes
2 answers
728 views

How can the height of a subject in picture be calculated? [duplicate]

Maybe is not the perfect stackexchange site to ask this but I try. Feel free to move or close my question, but, if you can, suggest me where I can ask this one: I took a photo with a compact digital ...
Christian's user avatar
  • 697
0 votes
2 answers
1k views

Estimate object size [duplicate]

If I have a [digital] photograph of an object, can I estimate it's approximate size? I notice with interest that my camera (Nikon D3300) seems to record the approximate focal length of the lens in ...
MathematicalOrchid's user avatar
0 votes
1 answer
126 views

How do I use EXIF tags to determine the length of an object in focus? [duplicate]

I have an image with EXIF information encoded into it. What I need to know is what information I can use to determine the length of a certain object. For example, are there tags that hold the camera ...
vs07's user avatar
  • 101
47 votes
5 answers
212k views

How do I calculate the distance of an object in a photo?

If I took a picture of a windmill on the horizon — given that I know the sensor size and the focal length of the lens and other factors to do with the shot — could I calculate how far away an object ...
Rob's user avatar
  • 2,621
3 votes
3 answers
18k views

Calculate object size when I have physical pixel size

How do I calculate the object size when I have focal length = 25 mm distance to object = 700 mm CCDs pixel size = 4.4 µm ? My camera is this USB 1/1.8" CCD C-mount camera. Edit: Could this work?...
chwi's user avatar
  • 151
4 votes
3 answers
2k views

What kind of lens is used in this picture of Earth?

The photos in an answer to this question show the Earth as very small as seen from the moon. I suspect that the lens used doesn't reflect how our eyes would see the Earth from the moon. Is there a way ...
Muze's user avatar
  • 1
0 votes
4 answers
4k views

Calculation for getting dimension of object in image not working

I am trying to calculate the dimensions of an object in an image. This is a sample image I took to get height of blue shirt: I am following the math from this page with sastanin's answer to How do I ...
omega's user avatar
  • 111
3 votes
2 answers
6k views

How to automatically measure subject dimensions (width/height/distance) without physically measuring?

What methods are used for automatically measuring the dimensions (width/height/distance/etc.) of a subject without having to get in there with a measuring tape? I am just starting to get into ...
Lance's user avatar
  • 247
2 votes
2 answers
1k views

Camera image in pixel to real image in meters size relation [closed]

first post so please be nice. I am doing an image processing project and my problem is now that I would like to know how big my digital image is in the real world. I have: digital image: 336x256 ...
Sebastian Ko's user avatar
2 votes
2 answers
1k views

How to calculate digital photo precision based on camera specification?

I'm doing a project which involves analyzing an object's width from a photo with given precision of about 0.1 mm. I am to the point where I have to choose which camera to buy in order to obtain the ...
Qrlet's user avatar
  • 43
0 votes
2 answers
2k views

How to determine film size from smartphone image exif data?

I took an image from my phone and got its exif data below. It was a samsung note 4, which uses a 35mm film size (24x36) with a 43.27 diagonal. But what I am trying to figure out is the sensor diagonal ...
omega's user avatar
  • 111
0 votes
1 answer
294 views

How to obtain a subject's measurement from image [duplicate]

I am trying measure real object height from an image. I'm using the below formula $$ \text{real height [mm]} = \frac{\text{object height [px]}\times \text{pixel size }\left[\mathrm{mm\over px}\right]\...
Arun's user avatar
  • 1