[英]How do I create a Mat matrix using OpenCV in Python?
Obviously this line is wrong.显然这条线是错误的。
matOut = cv2::Mat::Mat(height, width, cv2.CV_8UC4)
this one too.这个也是。
Mat matOut(height, width, cv2.CV_8UC4)
How do I create an modern openCV empty matrix with a given size, shape, format?如何创建具有给定大小、形状和格式的现代 openCV 空矩阵? The latest openCV docs on topic don't seem to be helping... I gleaned the formats used above directly from that document.
有关主题的最新 openCV 文档似乎没有帮助...我直接从该文档中收集了上面使用的格式。 Note: I'm assuming OpenCV (
import cv2
) Python3, import numpy
, etc...注意:我假设 OpenCV (
import cv2
) Python3, import numpy
等...
I was looking to create an empty matrix with the intent of copying content from a different buffer into it...我正在寻找创建一个空矩阵,目的是将内容从不同的缓冲区复制到其中...
edit, more failed attempts...编辑,更多失败的尝试......
matOut = cv2.numpy.Mat(height, width, cv2.CV_8UC4)
matOut = numpy.array(height, width, cv2.CV_8UC4)
So user696969 called out a largely successful solution to the question asked.因此,user696969 针对所提出的问题提出了一个非常成功的解决方案。 You create a new shaped area via:
您可以通过以下方式创建一个新的形状区域:
matOut = numpy.zeros([height, width, 4], dtype=numpy.uint8)
note I have replaced the desired content, cv2.CV_8UC4 , with its expected response, the number 4 .请注意,我已将所需内容cv2.CV_8UC4替换为其预期响应,即数字4 。 There are 4 eight bit bytes in a simple RGBA pixel descriptor.
一个简单的 RGBA 像素描述符中有 4 个八位字节。 I would have preferred if OpenCV tooling had performed that response as a function call, but that didn't seem to work...
如果 OpenCV 工具已将响应作为 function 调用执行,我会更喜欢,但这似乎不起作用......
I do want to share my use case.我确实想分享我的用例。 I originally was going to create an empty shaped matrix so I could transfer data from a single dimensional array there.
我原本打算创建一个空的形状矩阵,这样我就可以从那里的一维数组中传输数据。 As I worked this problem I realized there was a better way.
当我解决这个问题时,我意识到有更好的方法。 I start the routine where I have received a file containing 8 bit RGBA data without any prefix metadata.
我开始例程,其中我收到了一个包含 8 位 RGBA 数据的文件,没有任何前缀元数据。 Think raw BMP without any header info.
想想没有任何 header 信息的原始 BMP。
matContent = numpy.frombuffer(fileContent, numpy.uint8)
matContentReshaped = matContent.reshape(height, width, 4)
cv2.imshow("Display Window", matContentReshaped)
k = cv2.waitKey(0)
Thats it.而已。 Easy, Peasy.... Thanks to user696969 and eldesgraciado for help here.
简单,Peasy....感谢 user696969 和 eldesgraciado 在这里提供帮助。
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