How can I get position of draw rectangle on image?

[jobsilva]

Hello;

I'm creating OCR application and my idea is to draw rectangle on a image to create bounding box from where I want to extract text from image for get recognized text.

I'm trying to do it with GDI+ but I can't find a way to do it.

I don't know if there is any OCX or DLL library that allows me to do it without going crazy.

I really appreciate any help you can give me.

Best Regards.

 

[Scott24x7]

Jobsilva,
If I understand correctly, your intention is to perform OCR on an image based on an area (region) of the image, that the user selects, by dragging an area over the image with a mousedown and completing the selection of the area with a mouseup event. You want that to provide a graphical selection (rectangle/square) and then you will extract just those pixels/area of text to submit to an OCR engine for recognition.
Is this correct?


Best Regards,
Scott
MSc ISM, MIET, MASHRAE, CDCAP, CDCP, CDCS, CDCE, CTDC, CTIA, ATS, ATD

"I try to be nice, but sometimes my mouth doesn't cooperate.

 

[Chris Miller]

I think you focus too much on the thought your rectangle has to be a part of the image. You can have a container control made transparent in its backstyle, for example. I bet Scott has a solution at hand, just ensuring that's what you want before posting it.

Chriss

 

[Mike Lewis]

Placing a rectangle on top of an image would be straightforward. Just add a shape control to your form, make it initially the same size as the image, and put it in the same place. You can do all that programmatically.

What's more difficult is to fix it so that the user can drag the shape around or resize it. That's what Scott had in mind when he mentioned dragging the area in the mousedown. No doubt Scott or Chis will be able to suggest some code to help with that.

Meanwhile, you might take a look at Christof Wollenhaupt's SplitterBar class, in which he uses a similar technique to drag a vertical or horizontal bar around the screen. That's not exactly the same as what you want to do, but the the overall approach will be similar, so it should give you some ideas for how to go about it.

EDIT: You can download the SplitterBar (and lots of other good stuff) from

http://www.foxpert.com/downloads.html

Mike

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Mike Lewis (Edinburgh, Scotland)

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