将图像文件转换为Python中的float数组

Question

How can I convert an image to an array of float numbers? img = cv2.imread('img.png')

and now convert img to float so I get for print(img[0,0]) something like "[ 4.0 2.0 0.0] instead of [4 2 0]

Do you have an idea? Thank you very much!

Answer 1

You can convert the list of the integers to list of floats as [float(i) for i in values] with list comprehension.

An other option is to convert the img variable as numpy.ndarray to an other numpy.ndarray which contains float values:

img = img.astype(float)

After this assignment the results will contain float values.

Answer 2

You can also use Skimage's img_to_float() function.

image = io.imread('imagefilepath')
image = skimage.img_as_float(image)