CODEWITHSUNDEEP
pythonimage-processing
Rodrigo Souza
Rodrigo Souza

Reputation: 7352

How to read image data?

I want to create an application that receives an image with only black and white tiles. White tiles would mean a space that you can move in, while black tile would be a space that you can't move in (a wall maybe)

In this image i want to define a starting point and a goal point (maybe with diferent colors, red and yellow) so I can study pathfinding problems

How can I read an image and process the information it has in it?

It would be sometinhg like that: enter image description here

Here I'm able to define walls, starting point, goal point in an image and I'd like to read it's data. How can I do that in python?

Upvotes: 0

Views: 2794

Answers (2)

Falko
Falko

Reputation: 17932

You can use the SciPy library, which comes with many image processing tools:

from scipy import misc
img = misc.imread("lena.bmp")

You can easily access a pixel, e.g. at row 10 and column 15:

print img[10, 15]

Output:

[188 101  71]

(In this example I'm using the "Lena" test image from here.)

Depending on the image format you might want to convert it from an RGB color image to gray-scale:

img = img.mean(axis = 2)
print img[10, 15]

Output:

120.0

If you need to scale the uint8 pixel values to the range [0..1]:

img = (img / 255).round()
print img[10, 15], img[10, 6]

Output:

0.0 1.0

Upvotes: 3

tomer.z
tomer.z

Reputation: 1063

You can use the Image module from the PIL library (which you will need to install) then do something like:

from PIL import Image
img = Image.open("PATH TO IMAGE", "MODE (probably 'r')")
pixel = image.getpixel((x,y))

x,y are the pixel coordinates, and you can get the color of that pixel.

Upvotes: 0

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