Help on Perspective correction, Image stitching and then pattern matching.

Hi all

As a newbie in LabVIEW, I don't know a lot about machine vision.

I need for my project automation, stitching the images (from 4 cameras, 90 degrees). Do the perspective correction and then form a label (which is actually pasted on the jar).

Please share your experience on the same type of project. And help me to proceed with the development of the project.

Also find enclosed all the pictures from the camera.

PS: Due to budgetary constraints, I use very basic USB cameras available, and the attached picture is the actual image.

To be able to correct the image for distortion, you first have to calibrate it. Assuming that your setting of the camera is constant (i.e. the bottle always at the same place in what concerns the cameras, I would first of all paste a grid around the bottle calibration and then take a few pictures of this grid with all four cameras.)

We install a calibration grid, you can print: C:\Program Files (x 86) \National Instruments\Vision\Documentation\CalibrationGrid.pdf

This example will then show how you can learn the calibration using the images of the grid, and then the correct images would have taken you without the grid.

\LabVIEW 2010\examples\Vision\2. Calibration Example.llb\Nonlinear Calibration Example.vi Functions\Calibration\Nonlinear

Note that you need to recalibrate the system if something changes (lens focus, camera or bottle of position.

After this step, you should have 4 images 'straight' which have been corrected for distortion and which can be used for sewing.

For sewing, unfortunately, Vision Development Module does not include an exit of the seams of box function.

If this is acceptable, you can use some third party software that provide features couture, such as Photoshop Autostitch, Hugin, Ptgui, Panorama Tools, search for Microsoft Image Composite Editor, CleVR Stitcher or Adobe Systems.

If you need to do everything in LabVIEW, I can point you to some of the tools provided with the library you can use to create your own algorithm of seam. This part is certainly the most difficult of your project.

Image stitching process can be divided into three major components - image calibration, registration and fusion. We already talked about calibration.

-Image recording is to couple features in your images in order to align them. You can use tools like the corresponding model and edge detection for this purpose Watch examples of vision LabVIEW to know how to code in LabVIEW.

-Image mix is to process the images to account for the difference in brightness of images from several cameras.

Histogram analysis on the different images and applying a lookup table are simple tools that you can use for this purpose.

Images can then mingle with features like IMAQ ImageToImage.

This thread also talks about sewing:

http://forums.NI.com/T5/machine-vision/image-stitching/m-p/860414

Hope this help get you started. Good luck with your project.

-Christophe

Tags: NI Hardware

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