4.0 | 2 ratings Rate this file 343 downloads (last 30 days) File Size: 18.26 KB File ID: #22052

ROI Draw

10 Nov 2008 (Updated 04 Dec 2008)

ROI Draw allows you to draw rectangular ROI's at any angle.

File Information
Description	Most ROI Drawing Tools limit you to either drawing a circular ROI or a rectangular ROI perpendicular to the X-Y axis. ROI Draw's primary purpose is to expand upon the drawing of rectangular ROI's by allowing you to draw them at any angle. After selection of an ROI, ROI Draw crops and rotates your ROI into the X-Y plane using a bicubic interpolation algorithm (chosen in order to preserve textural properties) so that spatial statistics may be analyzed. ROI Draw outputs a .MAT file which, in addition to storing your rotated ROI, stores the original image and a mask file (for calculating pixel statistics), and the coordinates of the corners of your ROI so that they can be used to colocalize an ROI on another image. ROI Draw at this point only works for DICOM images as its primary purpose is for application in medical research.
Required Products	Image Processing Toolbox
MATLAB release	MATLAB 7.5 (R2007b)
Zip File Content
Other Files	ROIDraw.m, ROIDraw.fig

Tags for This File
Everyone's Tags	dicom, image, image processing(2), measurement, medical, probability(2), rectangle, rectangular, roi, rotation, signal processing(2), statistics(2)
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Comments and Ratings (2)
01 Dec 2008	Cris Luengo	I tried modifying it so it would work with other image file types, but ran into all sorts of problems because the code is so fragmented and duplicated. This is probably Guide's fault, and not the author's fault. But still, it's easier to write my own than trying to modify this one. I didn't understand how the interpolation rate is chosen. Also, why do you say bilinear interpolation preserves texture properties? I think you would be much better of with cubic interpolation than with linear interpolation.
04 Dec 2008	Christopher Changchien	If you take a look at the updates I changed it to bicubic interp.

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Updates
18 Nov 2008	- Fixed bug of unsaved contrast/zoom settings when shifting ROI's. - Now remembers which directory you are currently using so you don't have to re-navigate through the directory tree.
19 Nov 2008	eliminated double-for loop to make interpolation step more efficient (there should be little to no waiting time now). saved roi's as doubles for image processing. interpolation is done using bicubic instead of bilinear interp.
25 Nov 2008	added ability to control sample rate of ROI's so that the ROI's generated can have mm/pixel dimensions independent of the original image. added a help section. fixed a bug where user can draw a parallelogram on accident.
25 Nov 2008	forgot to fix a misplaced quote.
04 Dec 2008	none. just updating the description

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