[GRASS-dev] i.segment: invalid region id 0

[Pierre Roudier]

Any of you guys have code around to do hierarchical segmentation?
Tried to do it in Python a few months ago, but failed (I'm not exactly
a great Python coder it seems!).

Cheers,

Pierre

2013/7/31 Moritz Lennert <mlennert at club.worldonline.be>:
> On 27/07/13 00:19, Nikos Alexandris wrote:
>>
>> On Friday 26 of July 2013 15:41:25 Moritz Lennert wrote:
>>>
>>> On 26/07/13 15:17, Nikos Alexandris wrote:
>>>>
>>>> On Wednesday 17 of July 2013 12:56:58 Nikos Alexandris wrote:
>>>>>
>>>>> In any case, if wanted, I will try during the weekend to replicate a
>>>>> Huge
>>>>> region, as the one Moritz tested with a "rational" threshold (close to
>>>>> zero).
>>>>
>>>>
>>>> I couldn't make it -- my machine was under some sort of heavy
>>>> reconstruction during the last weekend.  Is this still of interest?  Let
>>>> a machine to chew-up a big region with i.segment?
>>>
>>>
>>> Markus and I have been busy testing in the last weeks and thanks to
>>> Markus' rapid reaction in correcting some bugs, we've been able to
>>> segment an image with 555,727,911 non-null cells in a region with
>>> 2,617,375,744 total cells. Markus' machine did this in just 15 hours !
>>> On mine it took much longer, but this is probably in large parts due to
>>> a software raid 5 that makes disk io really slow.
>>
>>
>> WoW! Great news!  Lot of work behind the scenes I guess. Thanks a
>> million...
>> Let me know if and what I can test (besides my on-going work in which I do
>> use
>> i.segment).
>
>
> Any feedback on your on-going work would already be helpful. Infos about
> performance (speed, quality of segmentation, etc). Tests of hierarchical
> segmentation with increasing thresholds.
>
> Moritz
>
> _______________________________________________
> grass-dev mailing list
> grass-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-dev



-- 
Scientist
Landcare Research, New Zealand