I referred lot many links but still I am not able to get any point from that I can start my development. I want to measure my image height, width and distance using camera. I found this app . I want to make this type of application not exactly same but quite same but for my requirement I want to measure my image height, width and distance using camera.
Can anyone give me/suggest me the right way or any example so that I can get more idea about this requirement.
I tried this :
http://android-er.blogspot.in/2012/04/gets-distances-from-camera-to-focus.html
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android
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android-camera
The answer is
For measuring distances with a single camera, you need to know some numbers. To measure height of something, say a chair, the only thing you have is the the size of it in the camera (which is in pixels, and can be converted to inches using screen size), that is all. The chance of measuring the height and width is using a reference, say a 6 foot tall person standing next to the chair.
This way you can work out in reverse using say a 10 foot tall object, using its size as appearing in the camera, you can work out the size of things at the same distance, on a surface that is not flat, even ensuring that they are at the same distance is a challenge.
So using the camera and just the camera, it is not possible. You need to know distance somehow, or need a reference.
If you are using the application to measure height of items you know the location of, then using GPS, you can find distance, and rest is math.
I have found some links using Google, they may help.
- http://forestjohnson.blogspot.com/2010/01/how-to-measure-size-of-object-using.html
- http://gigaom.com/mobile/how_to_measure_/
- http://www.iphonelife.com/blog/5/cameasure-use-your-camera-measure-size-or-distance
They may help you to find out what other information is needed other than what the camera can provide, so that you can think about your application as well regarding what can be done and what are the limitations.
One way is using multiple cameras, and that can be compensated using multiple pictures taken a known distance away. So the application can ask the user to take multiple images, track the distance using GPS, and probably it can work.
See these links as well:
First of all i will say Nice Thaught to develop such app.
Now i am not sure about it, but if you can able to get the face-detection like thing for any object in android camera so with help of that you can achieve that things.
Well i am not sure about it but still have give some view so you can get idea of it.
All the Best. :))
I think I know what you are asking for. Here is what you can do.
first get the height of the person say h meters.
if you can calculate the height of the camera from ground (using height if the person i.e. h) and get angles A and B using gyroscope or something from android then you can calculate the height of the object using the above formula.
Isn't this what you were looking for???
let me know if you need any explanation.
You can't.. You would have to know:
- How far is the object (you can know your location from GPS.. but the object's location?)
- What is the focal length of the camera
Maybe, just maybe if the object was optically tagged with for example a QR code, and you have a code-to-loc map...
If you know the viewport angle of the camera, you can use the height in pixels to determine the angle from the top to bottom of the object. Then, using the distance and arctangent calculate the height:
height = arctan(angle) * distance
To find the viewport angle, point the camera at something which is of known height, and make it exactly fill the screen. For example, point it at a ruler, and make it just far enough away that you can only barely see the ends of the ruler. Measure the distance from the camera, and then your total viewport angle is
viewportAngle = tan(ruler_length / distance)
Then, suppose your camera is 480px tall (cheap webcam), and the view angle is 20°. If you have an object onscreen which is 240px tall, then its angle is 10°. If you know it's 2 feet away, you would say 2 feet * arctan(10°) = ~4.1 inches tall. (I think... it's 2am so this may be a little off)
If you think about it, a body XRay scan (at the medical center) too needs this kind of measurement for estimating size of tumors. So they place a 1 Dollar Coin on the body, to do a comparative measurement.
Even newspaper is printed with some marks on the corners.
You need a reference to measure. May be you can get your person to wear a cap which has a few bright green circles. Once you recognize the size of the circle you can comparatively measure the remaining.
Or you can create a transparent 1 inch circle which will superimpose on the face, move the camera toward/away the face, aim your superimposed circle on that bright green circle on the cap. Then on your photo will be as per scale.
Source: Stackoverflow.com