How to reference an image without writing in Python

Question

This is the code that I currently have. I want to avoid writing an image then loading it again and then copying it. Why isn't my code in the second part working?

import cv2

load_imaged = cv2.imread("image.png", 0)

# Apply GaussianBlur to reduce image noise if it is required
otsu_threshold, otsu_result = cv2.threshold(
    load_imaged, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU, )
# Optimal threshold value is determined automatically.

# Visualize the image after the Otsu's method application
cv2.imwrite("otsu.png", otsu_result)

hole_image = cv2.imread("otsu.png")

# copy image
img = hole_image.copy()
imgray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

cv2.imshow("Image", imgray)
cv2.waitKey()
cv2.destroyAllWindows()

and I'm trying to reference the image like this (in line 9) but it's returning an error.

Invalid number of channels in input image: 'VScn::contains(scn)' where 'scn' is 1

import cv2

load_imaged = cv2.imread("image.png", 0)

# Apply GaussianBlur to reduce image noise if it is required
otsu_threshold, otsu_result = cv2.threshold(
    load_imaged, 0, 255, cv2.THRESH_BINARY + cv2.THRESH_OTSU, )
# copy image
img = otsu_result.copy()
imgray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

cv2.imshow("Image", imgray)
cv2.waitKey()
cv2.destroyAllWindows()

Any help is appreciated

Ahmet · Accepted Answer · 2020-12-21 08:43:02Z

2

You are trying to convert an gray-scale image into gray image.

Remove imgray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) line and you will get the result.

answered Dec 21, 2020 at 8:43

Ahmet

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2 Comments

Vincent Liow Over a year ago

That was a simple fix! Of course. I didn't think it would have been a problem. Thank you for the quick reply.

Ahmet Over a year ago

You're welcome. Make sure to check the shape of the image. (if gray-scale shape is width, height, if rgb width, height, 3). Also check this answer

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