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How to extract (x,y) coordinates of the boundary of a .tif image? - Printable Version

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How to extract (x,y) coordinates of the boundary of a .tif image? - Pythonista - Feb-05-2017

I want to get the (x,y) coordinates of the boundary of this TIF image - goo.gl/Uai8lR

I am using Python notebook in Anaconda distribution. I just need the height in pixels, so far I have used this code -

foo = misc.imread("90.tif")
prof = foo.sum(axis = 0)
prof = prof[:,1]/127
It reads the green channel of RGB and dividing by 127 gives the height in pixel. But it does not capture overhang regions. I think it will be a good idea to extract the (x,y) coordinates instead.

Any help is appreciated.

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Skaperen - Feb-05-2017

do you have a question?

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Pythonista - Feb-05-2017

(Feb-05-2017, 08:26 AM)Skaperen Wrote: do you have a question?

Yes, it's in the title.  Smile

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Skaperen - Feb-05-2017

that kind o question needs to go to the bar.

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Larz60+ - Feb-05-2017

This seems to have the answer you seek: http://stackoverflow.com/questions/15800704/python-get-image-size-without-loading-image-into-memory/

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Pythonista - Feb-05-2017

(Feb-05-2017, 12:22 PM)Larz60+ Wrote: This seems to have the answer you seek: http://stackoverflow.com/questions/15800704/python-get-image-size-without-loading-image-into-memory/

That question is about getting the image size, i.e. 800 * 600 pixels.

I want to get the (x,y) coordinates (in terms of pixels) of the pixels located on the boundary (red line). The original TIF file is here - goo.gl/Uai8lR

[Image: 9MpDhXj.png]

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Larz60+ - Feb-05-2017

Sorry, I saw a method of doing that in PyGame here http://stackoverflow.com/questions/20165686/pygame-image-position
You may be able to reverse engineer the code for rect if you don't find an easier method.

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - micseydel - Feb-05-2017

(Feb-05-2017, 10:53 AM)Skaperen Wrote: that kind o question needs to go to the bar.
If we're going to end up with Python code, the Bar isn't the right place.

RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Ofnuts - Feb-05-2017

Using the pillow (PIL) module:
from PIL import Image
im=Image.open('image.tif')
im.size
Output:
(127, 16)


RE: How to extract (x,y) coordinates of the boundary of a .tif image? - Skaperen - Feb-06-2017

(Feb-05-2017, 12:51 PM)Pythonista Wrote:
(Feb-05-2017, 12:22 PM)Larz60+ Wrote: This seems to have the answer you seek: http://stackoverflow.com/questions/15800704/python-get-image-size-without-loading-image-into-memory/

That question is about getting the image size, i.e. 800 * 600 pixels.

I want to get the (x,y) coordinates (in terms of pixels) of the pixels located on the boundary (red line). The original TIF file is here - goo.gl/Uai8lR

[Image: 9MpDhXj.png]

maybe the question should have been:  how do i get the border outline coordinates of this object (which object?) in an image?

do you want every pixel or just the points to draw lines from and to?