Image viewer plugins - multiple parameters from different functions

[Steven Silvester]

Marcel,

It sounds like you want use IPython traitlets 
<http://ipython.org/ipython-doc/dev/api/generated/IPython.utils.traitlets.html>, 
something like:

from IPython.utils.traitlets import HasTraits, Float, on_trait_change, Anyfrom skimage.viewer import ImageViewer
class Pipeline(HasTraits):

       param1 = Float(0.1)
       param2 = Float(0.2)
       param3 = Float(0.3)
       viewer = Any

       @on_trait_change('param1, param2')
       def use_previous_function(self):
            # do something with previous function

       @on_trait_change(''param3')
       def use_next_function(self):
            # do something with next function

v =ImageViewer(...)
p = Pipeline(viewer=v)

On Thursday, January 29, 2015 at 8:35:21 AM UTC-6, Marcel Gutsche wrote:

Hi Juan, 
>
> thanks for the hint. That could work, but i forgot to mention, that the 
> previous function is quite expensive to compute, so I would like to update 
> the first one only, if the slider for its parameter is touched. Right now i 
> try to reduce the amount of recomputations with memoization using the 
> joblib module, but I think I need a while to figure out when exactly values 
> are cached.
>
> Marcel  
>
> Am Donnerstag, 29. Januar 2015 12:01:14 UTC+1 schrieb Juan Nunez-Iglesias:
>>
>> Hi Marcel,
>>
>> I'm guessing you only need to see the final output of the pipeline? Why 
>> not define your own function?
>>
>> def piped(image, parameter1, parameter, another_parameter):
>>     a, b = previous_function(image, parameter1, parameter)
>>     new_image = next_function(image, a, b, another_parameter)
>>     return new_image
>>
>> Then use that in your plugin?
>>
>> Juan.
>>
>>
>>
>>
>> On Thu, Jan 29, 2015 at 7:58 PM, Marcel Gutsche <marcel.... at gmail.com> 
>> wrote:
>>
>>> Hi folks, 
>>>
>>> kind of a follow up question of my last one (see here 
>>> <https://groups.google.com/forum/#%21topic/scikit-image/WXrwvxFd8xA>). 
>>> <https://groups.google.com/forum/#%21topic/scikit-image/WXrwvxFd8xA> I 
>>> still have a chain of image processing tasks, which I want to visualize 
>>> with the image viewer. Certain parameters should be changed on the fly, 
>>> where i can see the results in the image viwer immediately by the use of 
>>> plugins. Something like this basically:
>>>
>>>
>>> a, b  = previous_function(image, parameter1 = 0.002
>>>                                     parameter = 0.02)
>>> new_image = next_function(image, a, b, another_parameter = 3)
>>>  
>>>
>>> I managed to pass the values a and b, generated by a previous function 
>>> using Juan's hint with functools.
>>>
>>> next_function
>>>
>>> which was fine as long as I don't want to change parameter1 and 
>>> parameter2 interactively. What do I do now, when I want to change them?  
>>>
>>> Using functools here won't get me far, since now I want to be able to 
>>> change parameter1 and parameter2 with a slider, as well as 
>>> another_parameter. 
>>>
>>> Maybe there is still a way to achive this, I saw something like a 
>>> callback argument for the widgets, but I am not sure how to use them or 
>>> whether they are related to my problem at all. I would also be fine with 
>>> writing my own Plugin class, but could not get my head around the given 
>>> examples. I feel that something like this is quite common, so I hope there 
>>> are already ways to achieve this. 
>>>
>>> Thanks a lot for the great work,
>>> Marcel
>>>  
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>>
>> ​
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