[Vv] Subtracting a preset value from the image & thresholding query

[Bilal Tahir]

Dear All,

In tools > Image arithm there are a number of operations that can be
performed on a single image. However, there doesn't seem to be an option to
subtract a value from the image data - only addition is present.

I want to subtract 1 from each pixel in my image.

In the Sum A(x) + v option I try to set the value as -1 but it doesn't
allow me to set a negative value? Is there an option to do it in vv?

Furthermore, I would like to know if vv allows for thresholding of image
data. E.g. I would like to set all values above a certain value to zero
e.g. Say I want to set all values of pixels above 1 standard deviation to
zero but at the same keep the pixel values for those below this threshold,
is there a way this can be done within vv?

If not, is there any software that can do this easily for .mhd
metaimage/DICOM files without needing to convert them into MATLAB and
convert them back?

Best wishes,

Bilal Tahir,
James Morrison Researcher in Radiotherapy Imaging
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.creatis.insa-lyon.fr/pipermail/vv/attachments/20130213/9f932fb6/attachment.html>