Image viewer plugins - multiple parameters from different functions

[Marcel Gutsche]

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 
> <javascript:>> 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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