我如何显示我的图像并在感兴趣的区域上绘制矩形并获取坐标？

Question

我想要的是读取图像并将其固定在屏幕上，然后在感兴趣的区域上手动绘制矩形并将它们输出为矩形的坐标，因为矩形留在图像上以了解哪个我标记的感兴趣区域。

第一步实际上是读取图像并将其固定在屏幕上，我按照文档所做的 http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_image_display/py_image_display.html :

img = cv2.imread('/home/user/Desktop/test_pic/1-0.png',0)
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

它没有用并给了我这个错误：

cv2.error: /io/opencv/modules/highgui/src/window.cpp:583: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvShowImage

我有运行这些命令：

sudo apt-get install build-essential checkinstall cmake pkg-config yasm
sudo apt-get install qt5-default libgtk2.0-dev libtbb-dev

但还是不行

下一步是在图像上绘制矩形并打印输出，我检查了 https://www.python-course.eu/tkinter_events_binds.php as well as Store mouse click event coordinates with matplotlib 但答案有点旧，我需要使用 CV2 而不是 matplotlib 除非我没有其他选择。因此，将不胜感激。

Answer 1

首先，您需要从源代码重新安装 OpenCV，就像@Wool pointed out 一样。（您可以跳过该文章第 3 步的第二部分，因为 virtualenv、scipy、matplotlib、scikit-image、scikit-learn 和 ipython 并不是真正必要的。）

至于代码，你可以使用这样的东西（基于this文章）：

import cv2

SELECTION_COLOUR = (222,0,222)
WINDOW_NAME = "Select regions with a mouse"
OUTPUT_FILE = "selection.png"

def click_select(event, x, y, flags, data):
    image, points = data
    if event == cv2.EVENT_LBUTTONDOWN:
        points.append((x, y))
    elif event == cv2.EVENT_LBUTTONUP:
        points.append((x, y))
        cv2.rectangle(image, points[-2], points[-1], SELECTION_COLOUR, 2)
        cv2.imshow(WINDOW_NAME, image)

def show_mouse_select(image_filename):
    orig = cv2.imread(image_filename)
    image = orig.copy()
    cv2.namedWindow(WINDOW_NAME)

    points = []
    cv2.setMouseCallback(WINDOW_NAME, click_select, (image, points))

    while True:
        cv2.imshow(WINDOW_NAME, image)
        key = cv2.waitKey(1)
        if key == ord('q'): break       # press q to exit

    # Output points and save image
    if len(points)>1:
        print ("Points:")
        for i in range(0,len(points),2):
            a, b = points[i], points[i+1]
            print (min(a,b), max(a,b))

        cv2.imwrite(OUTPUT_FILE, image)
        print ("Saved to:", OUTPUT_FILE)

    cv2.destroyAllWindows()

if __name__=="__main__":
    from sys import argv
    show_mouse_select(argv[1])

如果将其保存到文件 click_select.py，则可以运行 python3 click_select.py YOURIMAGE.

单击鼠标左键标记矩形的第一个点，向上单击标记第二个点。释放鼠标按钮后，您应该会看到一个洋红色矩形（如果您正确安装了 cv2）。按 q 按钮将退出循环，将点列表打印到标准输出并保存注释图像。

示例图片：

示例输出：

Points:
(27, 99) (53, 125)
(109, 22) (130, 46)
(42, 243) (71, 268)
(160, 209) (203, 249)
(146, 247) (178, 267)
(234, 285) (264, 310)
(261, 198) (306, 231)
(269, 226) (293, 250)
(285, 243) (312, 270)
(335, 257) (348, 268)
(355, 253) (370, 270)
(375, 248) (407, 269)
(417, 262) (451, 288)
(408, 293) (435, 311)
(356, 164) (392, 199)
(374, 193) (397, 221)
(440, 128) (464, 147)
(489, 150) (507, 168)
Saved to: selection.png

selection.png:

我如何显示我的图像并在感兴趣的区域上绘制矩形并获取坐标？

How can i display my images and draw rectangles over regions of interests and get the coordinates?

python

opencv

image-processing

cv2