如何在不同的OpenCV版本中使用`cv2.findContours`? [英] How to use `cv2.findContours` in different OpenCV versions?

问题描述

我正在尝试将OpenCV与Python配合使用，以便检测来自Raspberry Pi摄像机的实时视频源中的正方形.但是，下面的代码中的cv2.GaussianBlur和cv2.Canny函数导致以下错误:"TypeError:numpy.ndarray'对象不可调用"..

I am trying to use OpenCV with Python in order to detect squares in a live video feed from a Raspberry Pi camera. However, the cv2.GaussianBlur and cv2.Canny functions in the code below are causing the following error: "TypeError: numpy.ndarray' object is not callable".

我似乎无法解决该错误.任何帮助表示赞赏.

I cannot seem to resolve the error. Any help is appreciated.

代码取自

推荐答案

使用2.x，3.x，4.x的另一种方法是:

An alternative to work with 2.x 、3.x、4.x is:

cnts, hiers = cv2.findContours(...)[-2:]

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注意:

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Notice:

cv2.findContours已更改，但是在OpenCV 4.0中，它变回来了！！！

cv2.findContours has changed since OpenCV 3.x, but in OpenCV 4.0 it changes back!!!

在OpenCV 3.4中:

In OpenCV 3.4:

findContours(image, mode, method[, contours[, hierarchy[, offset]]]) -> image, contours, hierarchy

在OpenCV 4.0中:

In OpenCV 4.0:

findContours(image, mode, method[, contours[, hierarchy[, offset]]]) -> contours, hierarchy

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