How to convert byte array to OpenCV Mat in Python

Question

How do I convert a byte array to Mat object in Python.

import numpy as np

mat = np.asarray(0, 0, data)        
print 'Cols n Row ' + str(mat.cols) + " " + str(mat.rows)

But it is not working. Can some one help.

do you get error message or what ? What is data ? What result do you expect ? — furas
– furas, Commented Jan 16, 2017 at 23:44
data is the byte array, which I want to convert as OpenCV Mat. I am not getting any output. This is the error TypeError: data type not understood — jgm
– jgm, Commented Jan 16, 2017 at 23:48
You should be using cv2.imdecode as explained in the following answer stackoverflow.com/questions/17170752/… — Surya Avala
– Surya Avala, Commented Jan 16, 2017 at 23:57
Possible duplicate of Python OpenCV load image from byte string — Surya Avala
– Surya Avala, Commented Jan 16, 2017 at 23:59

ilke444 · Accepted Answer · 2017-01-17 00:43:10Z

1

What about giving it a try like this? Probably you need to define the data type of the matrix, else it is not obvious how to divide the byte array into 'chunks' that will be stored in one cell.

mat = np.asarray(data, dtype=np.uint8)        
print 'Cols n Row ' + str(mat.shape[1]) + " " + str(mat.shape[0])

answered Jan 17, 2017 at 0:43

ilke444

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