how to select a region for analysis from a very big image

[7890000]

Hello everybody, 

The imgaes recorded are very big, with 1288*964 in scale.  The regions I am interested is only a strip (say, (0, 400), (1288, 420) ) in the middle of the images. I need to anaylze the strip, and get some useful information. I  do not care other regions. and do not want to wast computer resouce.   I read some fuctions about ROI. should I use ROI?  To be honest, I have not understanded fully about the functions of  ROI,  and not fixed the problem.    I think my case is very general.      Could you please give me some suggesion ? or some relevant code examples?   Thank you very  much.

Beetle.

[GuenterMueller]

Hi beetle.

Your previous thread already gave you some good advice where to start.  Have you looked at the Vision examples in LabVIEW?  As your previous thread said: "After installing the software, open LabVIEW and navigate to Help » Find Examples... » Toolkits and Modules."  You can also filter from the examples those that cover ROIs by searching with the term ROI.

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7890000 wrote:

The imgaes recorded are very big, with 1288*964 in scale.  The regions I am interested is only a strip (say, (0, 400), (1288, 420) ) in the middle of the images. I need to anaylze the strip, and get some useful information. I  do not care other regions. and do not want to wast computer resouce.   I read some fuctions about ROI. should I use ROI?  [...]

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Yes, ROIs are a good and the right approach.

Hope this helps, Guenter

[7890000]

Hi Guenter,

Thank you very much. I will try

Beetle

[udka]

Hi 7890000, Yes, ROIs are best for your function.
-Make your four points in rectangle- Left,Top,Right,Bottom and angle (Might be zero if needed) bundle them using cluster palette.
-Convert your Rectangle to ROI using IMAQ convert Rectangle to ROI.
-Then use this ROI descriptor for further use.
-One more thing can be, Use your four points as input to Optional rectangle for IMAQ extract VI and after extracting the required region you can process.