profile_line

[Juan Nunez-Iglesias]

Hey Jaime,

Yes, if you set the interpolation order equal to 0, that resolves to
nearest neighbor interpolation, so it will pick the value from the nearest
pixel. The coordinates will still be fractional so that distances are
preserved, though. I hope that's still useful to you! =)

Juan.

On Fri, Apr 15, 2016 at 9:43 AM, Jaime Lopez Carvajal <jalopcar at gmail.com>
wrote:

> 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>
>> 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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