What is equivalent of cvCreateMat function in OpenCV2 using python3

Question

I am converting an old piece of code written in c/cpp into python. It uses cvCreateMat function. From this link I believe that cvCreateMat function is not supported in OpenCV2. I dont know how to do it using OpenCV2/numpy. OR all I need is the equivalent of the following line in python.

cv::Mat a = cvCreateMat(3*numberOfMatrices, 6,CV_64FC1);

answers.opencv.org/question/30037/cv2createmat-in-python This should help you. — keineahnung2345
– keineahnung2345, Commented Feb 15, 2019 at 11:01
@Miki I dont know what will I put in type. If numberOfMatrices is 6 then I guess the cvCreateMat will create a matrix of 18 rows 6 columns, initialized with 0. I am also not sure do I need np.array or np.matrix. — drmaa
– drmaa, Commented Feb 15, 2019 at 11:11
@Spinkoo I want the equivalent because the later functions utilize this data. I believe the cvCreateMat is replaced by numpy. — drmaa
– drmaa, Commented Feb 15, 2019 at 11:13

Spinkoo · Accepted Answer · 2019-02-24 13:52:20Z

1

I think this should do

// the third 3 is so it has 3 dimensions which i suppose what you need
size = 3*numberOfMatrices, 6
img = np.zeros(size, dtype=np.float64)

this is the correct format to create

edited Feb 24, 2019 at 13:52

answered Feb 15, 2019 at 11:29

Spinkoo

2,0701 gold badge9 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

drmaa Over a year ago

Yes I think something similar but I found this link which gives a bit different format for it.

drmaa Over a year ago

Will it not be `img = np.zeros((3*numberOfMatrices, 6), dtype=np.float64)

drmaa Over a year ago

It works to create matrix of 0's but I am not sure if it is eqivalent of cvCreateMat? Do you know? If yes i will accept it as answer.

Spinkoo Over a year ago

Yes it its the equivalent to do it in python you can call it with np.ones too if yo want

drmaa Over a year ago

Hi Spinkoo please remove the last 3 from size = 3*numberOfMatrices, 6, 3. It should be size = 3*numberOfMatrices, 6

Collectives™ on Stack Overflow

What is equivalent of cvCreateMat function in OpenCV2 using python3

1 Answer 1

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related