Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Converting a magnified image of a line to a single pixel smoothed
Replies: 11   Last Post: Apr 26, 2013 4:24 AM

 Messages: [ Previous | Next ]
 Joerg Roesgen Posts: 4 Registered: 5/19/10
Re: Converting a magnified image of a line to a single
Posted: Apr 24, 2013 7:02 AM

This command SelectComponents has the form SelectComponents[m,"prop",crit]. I can't find any list of properties corresponding to "prop." Any ideas?

Thanks,
J=F6rg

On Apr 20, 2013, at 05:41 , Dave Waddell wrote:

> I tried converting the result image to a graph so that I could apply a
> moving average and then fit a B-spline through it. As you can tell I'm new
> to Mathematica:
> data = ArrayRules@SparseArray@ImageData[result]
> It was all downhill after that. Another nudge would be appreciated.
> Thanks, Dave.
>
> Dave,
>
> On 4/17/13 1:30 AM, Dave Waddell wrote:

>> I have a magnified image of a 0.1mm line here:
>> http://www.d-a-v-e.org/images/Trace.jpg
>> ... this converts with Binarize very well:
>> http://www.d-a-v-e.org/images/Trace%20binary.jpg
>> ... but what I would like to do is convert it to a single pixel wide

> smoothed line running right up the middle. Any suggestions or pointers on
> how to do this in Mathematica would be appreciated.

>> Dave
>>

>
> The sequence below seems like a good start.
> The documentation for the functions should help you understand what is going
> on in more details:
>
> trace = Import["http://www.d-a-v-e.org/images/Trace.jpg"]
>
> b = ColorNegate@Binarize[trace];
> b2 = SelectComponents[b, "Area", -1];
> b3 = FillingTransform@b2;
> result = ColorNegate@Image[WatershedComponents[dt], "Bit"];
> HighlightImage[trace, result]
>
>
> Matthias Odisio
> Wolfram Research
>
>
>

Date Subject Author