Linked Questions

0
votes
2answers
9k views

How to calculate the size of object in pixels, knowing the camera properties and distance? [duplicate]

I'm trying to calculate the size of an object in pixels in an image, when I have these information: x * y = the size of the real object in meters q = the quality of the image in ppi d = the distance ...
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votes
1answer
3k views

Calculate the distance of an object in a photo Android [duplicate]

https://photo.stackexchange.com/a/12437/61513 here is a formula for calculating distance if we know the size of the object. Can I use this method for photos/frames made by Android cameras? And if I ...
1
vote
2answers
1k views

Calculate the distance of an object in a picture? [duplicate]

I'd like to know the distance between the camera and the object, just by looking at the object height (pixels) or it's width and the real life dimensions. Here is a formula we can get on the internet: ...
-1
votes
3answers
1k views

How to calculate distance of an object from camera or size of an object in an image? Have to utilise already generated camera parameters to find these [duplicate]

How to calculate distance of an object from camera or calculate the size of a object in an image? Given that, I have already generated the camera parameters (intrinsic and extrinsic). I have to ...
0
votes
1answer
153 views

Estimating Distance From An Image [duplicate]

Assuming that the person stands parallel to a wall. The person and the wall are at the same ground level. The person takes a picture of the wall (Considering that the person always captures the bottom ...
1
vote
0answers
85 views

Calculate Distance to Object in Android knowing the Size, Focal Length [duplicate]

I'm trying to find the distance to an object with my Android. I know the real size of object, also done some camera calibration with OpenCV to calculate focal length, camera matrix and distortion ...
0
votes
0answers
25 views

how to find the distance of Object from the camera, which is formed an image size 320,240 [duplicate]

I have an image with the size of (m,n), how to find out that, what distance the objects are taken, the image is taken by ptz camera of the focal length of 4mm-25mm.
7
votes
3answers
4k views

Can we measure size of an object using EXIF data from a photo?

A lot of people have asked if we can measure the distance of an object in photo. But I was wondering if we can measure the size of an object in photo. Of course assuming we know everything from sensor ...
0
votes
4answers
2k 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. How do I ...
3
votes
2answers
5k 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 ...
4
votes
3answers
965 views

Why isn't my computation of the actual size of an object in a photograph matching the expected value?

Let's say I have a full frame camera (Sony A7) with a 50 mm lens (Canon FDn 50mm f/1.4) mounted on it. At a given object (a plane) distance I should be able to compute the size of the image in real ...
4
votes
2answers
2k views

Why does calculated distance of an object in an image vary when zooming?

I would like to calculate the distance of an object from my camera, so i used the formula given in this question and I got a very good answer, but I've found that when I zoom and take the picture and ...
2
votes
3answers
1k views

What is 'sensor height?'

The accepted answer to the question, How do I calculate the distance of an object in a photo?, refers to sensor height. What is sensor height and how do find/calculate it in this context? I'm using a ...
0
votes
2answers
2k views

Pixel size at long distance

is there a formula to calculate the pixel size of a object at long distance? Here is the scenario, I have a very small object 1cm by 1cm at 200m away from my camera. The camera has a resolution of ...
1
vote
3answers
803 views

Is my distance/size math for macro photography correct?

I was comparing Panasonic lenses the other day, and I wanted to know about their macro capabilities. Obviously Panasonic lists the closest focusing distance, but this doesn't tell me much about the ...

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