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<p>我正在尝试截图,然后将其转换为numpy数组。然后我想使用屏幕截图运行cv2.matchTemplate。到目前为止,我唯一的方法是保存图像:cv2.imwrite('temp.png',imcv),然后在cv2.matchTemplate中使用该图像。这似乎大错特错。如何正确转换numpy数组以避免保存并直接传递给cv2.matchTemplate函数?</p>
<p>我在Ubuntu btw做这个项目</p>
<pre><code>import pyscreenshot as ImageGrab
import PIL
import cv2
import numpy as np
from matplotlib import pyplot as plt
# part of the screen
im=ImageGrab.grab(bbox=(65,50,835,725)) # X1,Y1,X2,Y2
#convert to numpy array
im=im.convert('RGB')
imcv = np.array(im)
imcv = imcv[:, :, ::-1].copy()
cv2.imwrite('temp.png',imcv)
img = cv2.imread('temp.png',0)
template = cv2.imread('fight.png',0)
w, h = template.shape[::-1]
# Apply template Matching
res = cv2.matchTemplate(img,template,cv2.TM_CCOEFF)
min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)
print(min_val)
print(max_val)
print(min_loc)
print(max_loc)
if(max_loc == (484,125)):
print("True!")
top_left = max_loc
bottom_right = (top_left[0] + w, top_left[1] + h)
cv2.rectangle(img,top_left, bottom_right, 255, 2)
plt.subplot(121),plt.imshow(res,cmap = 'gray')
plt.title('Matching Result'), plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(img,cmap = 'gray')
plt.title('Detected Point'), plt.xticks([]), plt.yticks([])
plt.suptitle(cv2.TM_CCOEFF)
plt.show()
</code></pre>
<p>这也是最简单的方法:我还将在代码后发布错误消息。</p>
<pre><code>import pyscreenshot as ImageGrab
import PIL
import cv2
import numpy
im=ImageGrab.grab(bbox=(65,50,835,725)) # X1,Y1,X2,Y2
print type(im)
im=im.convert('RGB')
print type(im)
im = numpy.array(im)
print type(im)
im = im[:, :, ::-1].copy()
print type(im)
cv2.cv.fromarray(im)
print type(im)
template = cv2.imread('fight.png',0)
templateTest = cv2.matchTemplate(im,template,cv2.TM_CCOEFF)
min_val, max_val, min_loc, max_loc = cv2.minMaxLoc(res)
print(min_val)
print(max_val)
print(min_loc)
print(max_loc)
<type 'instance'>
<type 'instance'>
<type 'numpy.ndarray'>
<type 'numpy.ndarray'>
<type 'numpy.ndarray'>
OpenCV Error: Assertion failed ((img.depth() == CV_8U || img.depth() == CV_32F) && img.type() == templ.type()) in matchTemplate, file /home/kninja/Downloads/opencv-2.4.9/modules/imgproc/src/templmatch.cpp, line 249
Traceback (most recent call last):
File "StartOVer.py", line 32, in <module>
res = cv2.matchTemplate(im,template,cv2.TM_CCOEFF)
cv2.error: /home/kninja/Downloads/opencv-2.4.9/modules/imgproc/src/templmatch.cpp:249: error: (-215) (img.depth() == CV_8U || img.depth() == CV_32F) && img.type() == templ.type() in function matchTemplate
</code></pre>