Hello Lucy,
If you want to use a dual processing approach, you need to adjust your imaging setup so that you can acquire two similar regions of interest. Besides adjusting the working distance (the physical distance between the camera lens and the object under inspection), you can also select particular regions of interest using Machine Vision VIs or the ROI tools on Image Display. You may also need to correct for perspective distortion introduced by capturing images from two different cameras with two different orientations to the object under inspection. The NI Example Finder includes a shipping example entitled Perspective Calibration Example.vi which you may want to review.
Once you have two similar regions of interest, you can overlay results (lines, points, etc.) from one region onto the other. On the block diagram Functions Palette, search for subVIs within the Vision and Motion>>Vision Utilities>>Overlay group. You may also want to experiment with a single processing approach where you just look at one image and perform all your measurements and analysis on this single image.
If your edges appear discontinuous, you might try various morphological transformations (close, for example) to attempt to join the discontinuous edges into a continuous edge. In addition to the NI Vision for LabVIEW Help, you can find more information in the
NI Vision Concepts Manual. Ch. 6 covers arithmetic and logic operators, Ch. 11 covers edge detection, and Ch. 12 covers pattern matching.
Best Regards,
T. McCarty
