profile_line

[Jaime Lopez Carvajal]

Hi Juan,

Thanks, now I understand how it works.
Do you know how can I get the gray values without interpolation, just the 
raw gray values taken from original image?

Thanks in advance, Jaime

On Thursday, April 14, 2016 at 6:41:43 PM UTC-4, Juan Nunez-Iglesias wrote:
>
> No, those aren't the correct coordinates. ;)
>
> profile_line ensures that the coordinates are spaced 1 pixel apart, and 
> then performs interpolation (the "order" argument to the function) to find 
> the values.
>
> On Fri, Apr 15, 2016 at 1:54 AM, Jaime Lopez Carvajal <jalo... at gmail.com 
> <javascript:>> wrote:
>
>> Sorry, the correct coordinates are:
>> coords = np.array([[0, 0],
>>
>>        [0, 0],
>>        [1, 1],
>>        [1, 2],
>>        [2, 3],
>>        [2, 3],
>>        [3, 4],
>>        [4, 5],
>>        [4, 6],
>>        [5, 6],
>>        [5, 7],
>>        [6, 8],
>>        [7, 9]])
>>
>>
>> On Thursday, April 14, 2016 at 11:42:01 AM UTC-4, Jaime Lopez Carvajal 
>> wrote:
>>>
>>> HI friends,
>>>
>>> I am having problems with *profile_line function*, because I want to 
>>> get gray values following some coordinates, but it is given to me wrong 
>>> gray values
>>> that does not exist in the original image, like 128, 126 or 64.
>>>
>>> image = np.array([[170, 170,  70,  70,  70,  70,  70,  70,  70,  70],
>>>        [170, 170,  70,  70,  70,  70,  70,  70,  90,  70],
>>>        [170, 170, 170,  70,  70,  70,  70,  70,  70,  70],
>>>        [170, 170, 170,  70,  70,  70,  70,  70,  70,  70],
>>>        [170, 170, 170,  70,  70,  70,  70,  70,  70,  70],
>>>        [170, 170, 170, 170,  70,  70,  70,  70,  70,  70],
>>>        [110, 170, 170, 170,  70,  70,  70,  70,  70,  70],
>>>        [ 50, 170, 170, 170,  70,  70,  70,  70,  70,  10],
>>>        [ 50,  50, 170, 170,  70,  70,  70,  70,  10,  10],
>>>        [ 50, 110, 110, 110,  70,  70,  70,  70,  10,  10]], dtype=uint8)
>>>
>>>
>>> coords = np.array([[70,  0],
>>>
>>>        [70,  0],
>>>        [71,  1],
>>>        [71,  2],
>>>        [72,  3],
>>>        [72,  4],
>>>        [73,  4],
>>>        [74,  5],
>>>        [74,  6],
>>>        [75,  7],
>>>        [75,  8],
>>>        [76,  8],
>>>        [77,  9]])
>>>
>>>
>>> gray_values = profile_line(image,(0,0),(7,9)).astype(int)
>>>
>>> gray_values
>>>
>>> array([170, 170, 128, 126,  70,  70,  70,  70,  70,  70,  70,  64,  10])
>>>
>>>
>>> but the correct values would be:
>>>
>>> gray_values
>>>
>>> array([170, 170, 170, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70])
>>>
>>>
>>> Do you know why this is happening? Any suggestion?
>>>
>>>
>>> Thanks in advance, Jaime
>>>
>>> -- 
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