extract the overlay portion of an image

[skyover]

i use the IMAQ overlay Retangle.vi to the image,and then i want to extract the portion inside the retangle to process,how can i do it?

thanks

[muks]

You can use Imaq extract vi for this purpose.Just feed the rectangle co-ordiantes (top,left bottom and right) defining the region to be extracted

[muks]

Message Edited by muks on 10-16-2008 03:58 AM

[skyover]

but if it is a rotated retangle(such as rotated 45° ),it can not work well as you said

帖子被skyover在 10-16-2008 05:16 AM

时编辑过了

[skyover]

please see my another POST "How to overlay a part of image with inclined retangle "

How to overlay a part of image with inclined retangle

帖子被skyover在 10-16-2008 05:25 AM

时编辑过了

[muks]

If it the continuation with the same question then why start a new thread?

[muks]

My suggestion would if can get the angle then rotate the image by reference to that angle and then extract.

[greg83]

Hi!

Same trouble!! I need a function so that it can extract a rotated rectangle. Extract.vi only returns a part of an image parallel to X and Y axis. I'd like to get one function that you can pass 4 point (coordinates) and maybe an angle of rotation so you get a rotated rentangle.

I know IMAQ rotate.vi does exists but it doesn't help, I need what I told before!!

Thanks 

[muks]

---

Same trouble!! I need a function so that it can extract a rotated rectangle. Extract.vi only returns a part of an image parallel to X and Y axis. I'd like to get one function that you can pass 4 point (coordinates) and maybe an angle of rotation so you get a rotated rentangle.

I know IMAQ rotate.vi does exists but it doesn't help, I need what I told before!!

---

How do you say the rotate will not help here?

[Andrey_Dmitriev]

Hi, Greg,

Do not search "ready-for-use-super-puper-universal-tool", just use suggested functions in combination:

Just starting point for you:

And result:

Now you have two images - one is extracted and masked (areas outside of rotated rectangle are filled with black. The second image is rotated and cropped to size of the original rotated rectangle. I have used fixed coords, but they should be calculated based on original size and angle (simple arithmetic).

best regards,

Andrey.