CODEWITHSUNDEEP
pythonopencv3.0
Anthony
Anthony

Reputation: 35928

ValueError: need more than 2 values to unpack - When reading GRAYSCALE

I am reading an image from a string like this. I know the image is in GrayScale. 

nparr = np.fromstring(image_string, np.uint8)
roi = cv2.imdecode(nparr,cv2.IMREAD_GRAYSCALE)

But I am getting an error when I get the shape of the image

h,w,d = roi.shape #gives error

The error I get is:

    h, w, d = roi.shape
ValueError: need more than 2 values to unpack

If I change cv2.IMREAD_GRAYSCALE to cv2.IMREAD_COLOR then I don't get the error but I believe doing this changes my image slightly because I get different results when I do further processing on it.

Upvotes: 1

Views: 11274

Answers (1)

K L
K L

Reputation: 306

roi.shape has only two values.

nparr = np.fromstring(image_string, np.uint8)
roi = cv2.imdecode(nparr, cv2.IMREAD_GRAYSCALE)
h, w = roi.shape

External reference

Upvotes: 1

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