Correction of image taken at different angle of camera

[Ketan Patel]

Hi......I am taking images of one object on which some text is written. But problem is that camera is at some horizontal & vertical angle of object.

Because of this elevation of camera I am not able to recognize some character.....

so is this possible to make some planner correction of image So I can read character like reading of it exactly in front of camera?

I am using labview 8.6 with vision builder and vision development module 8.6.

like in this attached image I want to make some image correction so I can make image in which object is somewhat in front of camera and I can read character exactly........

[muks]

You can calibrate the image using co-ordinate system. I have used this mainly when the object as to be at certain view to the camera and any slight deviation will be corrected.

My suggestion for this is cannot the processing be directly done considering the angle and tilt is going to remain constant? Can you post an image?

[Ketan Patel]

Thanks for reply.........i have attached one engine image,in which i want to read character written on front of engine.

so is this possible with co-ordinate system that i can make image like that character is in front of camera so i can read character exactly??????

[Ketan Patel]

Thanks for reply.........i have attached one engine image,in which i want to read character written on front of engine.

so is this possible with co-ordinate system that i can make image like that character is in front of camera so i can read character exactly??????

[muks]

For this application you need not have to use a co-ordinate system. The engine will be captured within this frame right? The camera will not move? Use Pattern matching and use a template that is really distinguishable and with that as the reference draw a bounding box and use OCR.

[Ketan Patel]

ok.....but all engine models are different so pattern matching is not possible and also location of character is different in some engine models.

Hey do u know about perspective error in image due to camera angle???? this problem of camera angle is known as perspective error....

How can i calibrate image for this error?

see this image of perspective error....

Ya camera is stable and it capture image like this.....

[muks]

See the Perspective Calibration Example from the example finder.

[Ketan Patel]

thanks......i'll try this and after that i'll tell you....

Thanks for helping....

[muks]

C:\Program Files\National Instruments\LabVIEW 8.0\examples\Vision\2. Functions\Calibration\Perspective Calibration Example.llb\Perspective Calibration Example.vi.

If at all you have difficulty finding it.