IMAQdx multi-camera systems: shortcuts for composite image sewn

Imagine a system using for example multiple GigE cameras through IMAQdx interface where we want to be a stitched composite of multiple camera views. The principle of sewing is naïve, simple concatenation, one next to the other.

The problem is that, when it is trivial to build a composite image, it is difficult to do this very effectively. Image sizes are large, tens of millions of pixels, so that each copy of questions. Configurations material alternative would open many options but say we are stuck using GigE cameras and (at least initially) the IMAQdx interface. What are the tips or even hacks, you guys can imagine facing this challenge?

I've seen some talk about the IMAQdx capture buffers and it seems to me that one can not manually allocate these buffers or access it directly. The absolute best scenario would obviously be to hack your way around to spread the image data next to each other in memory, sort of as follows in scenario1.png:

The foregoing, however, don't seem to be too easy to achieve. Second scenario would be to acquire in the individual buffers and perform one copy in the composite image. See the illustration below:

Interfaces usually allow this with relative ease. I have not yet tested, but based on the documentation using ring acquisition of buffer and "Extracted IMAQdx Image.vi" this should be possible. Can anyone confirm this? The copy can be carried out by an external code as well. The last scenario, without ring buffer, using ' IMAQdx to Image2.vi ' might look like this:

The second copy is a loss for this scenario should be out of the question.

I hope this makes some. Want you magicians say about this?

Unfortunately he has no concept of a "sub-image" where you could have acquired acquire seamlessly in an image that represents a region of a larger image. However, you are right that the acquisition of the ring with the extract is the way to remove a copy. In this mode, the user allocates the internal buffers imaqdx uses by means of standard images, and then they can access those without copying directly. You can simply extract the image of each camera (zero-copy) ring buffer, then use the VI ImageToImage to copy a region in your larger picture (a copy).

Eric

Tags: NI Hardware

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