| Re: Medical Imaging Question [message #16784 is a reply to message #16618] |
Wed, 18 August 1999 00:00   |
edward.s.meinel
Messages: 12
Registered: May 1999
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Junior Member |
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In article <MPG.1214e6875d54157c98987f@news.frii.com>,
davidf@dfanning.com (David Fanning) wrote:
>
> Let me see if I understand this correctly. Are you saying
> that I might have sliders that would select a "window" of
> data. Say between the values of 1000 and 3500, and that
> what I would see on my display would be something like
> this:
>
> TV, BytScl(image, Max=3500, Min=100, Top=!D.Table_Size-1)
>
> In other words, the gray scale values could be a portion
> or window onto the entire data universe. If this is so,
> how do you usually implement such a sliding window into
> your data?
>
There's lots of ways to do that.
1)Sliders to set the max and min
2)Sliders to set the contrast (slope) and brightness (y-intercept)
3)Sliders or text-entry widgets to set the upper and lower penetration
points
4)Select min and max on a plot of the histogram
Personally, I like #2 the least, but others like it because it works
sort of like your monitor and TV controls. What I do is a combination of
1, 3, and 4. I have a plot of the histogram and below it are three text
widgets -- one displays the cursor location in the histogram window
(I suppose I could also include one that displays the number of bin
members), the second is for entering either the minimum value or lower
penetration point (if it is between 0.00 and 1.00 assume penetration
point, otherwise it's the minimum value), and the third is for entering
either the maximum value or upper penetration point. I can also select
the minimum and maximum levels using the histogram window -- left mouse
button selects the minimum, right mouse button selects the maximum.
Ed Meinel
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