在python中使用openCV創建Mat

Question

我習慣了java的實現OpenCV。我想創建一個Mat結構，向其中填充數據，提取一個子域，然後應用一些圖像轉換。因此，在java，我用

my_mat = new Mat(my_rows, my_cols, CvType.CV_8U); 
my_mat.put(0, 0, my_data); 
my_mat.submat(0, my_other_rows, 0, my_other_cols); 

但我沒有發現任何東西在python的OpenCV工作。我發現這link，但它被打破

Answer 1

對於OpenCV的1.x中：

您可以使用CreateMat做到這一點：

Creates a matrix header and allocates the matrix data.

Python: cv.CreateMat(rows, cols, type) → mat 
    Parameters: 
     rows – Number of rows in the matrix 
     cols – Number of columns in the matrix 
     type – The type of the matrix elements in the form CV_<bit depth><S|U|F>C<number of channels> , where S=signed, U=unsigned, F=float. For example, CV _ 8UC1 means the elements are 8-bit unsigned and the there is 1 channel, and CV _ 32SC2 means the elements are 32-bit signed and there are 2 channels. 

函數調用等效於以下代碼：

CvMat* mat = cvCreateMatHeader(rows, cols, type); 
cvCreateData(mat); 

對於CV2接口：

Python的新CV2接口集成numpy陣列到OpenCV的框架，因爲它們是用簡單的多維數組表示，這使得操作更加簡單。 這裏有一個開始的例子：

import numpy as np, cv 
vis = np.zeros((384, 836), np.float32) 
h,w = vis.shape 
vis2 = cv.CreateMat(h, w, cv.CV_32FC3) 
vis0 = cv.fromarray(vis)