ncc模板匹配代码python
时间: 2023-10-12 18:21:56 浏览: 260
好的,我可以提供一些关于ncc模板匹配的Python代码参考:
```
import cv2
import numpy as np
def ncc_template_matching(image, template):
# Convert the image and template to grayscale
img_gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
temp_gray = cv2.cvtColor(template, cv2.COLOR_BGR2GRAY)
# Compute the mean of the image and the template
img_mean = np.mean(img_gray)
temp_mean = np.mean(temp_gray)
# Compute the normalized cross-correlation
ncc = cv2.matchTemplate(img_gray, temp_gray, cv2.TM_CCORR_NORMED)
# Find the location of the maximum correlation value
_, _, _, max_loc = cv2.minMaxLoc(ncc)
# Compute the offset of the template from the image
x_offset = max_loc[0] - int(template.shape[1] / 2)
y_offset = max_loc[1] - int(template.shape[0] / 2)
# Return the offset and correlation value
return x_offset, y_offset, ncc[max_loc[1], max_loc[0]]
# Example usage
image = cv2.imread('image.jpg')
template = cv2.imread('template.jpg')
x_offset, y_offset, correlation = ncc_template_matching(image, template)
print(f"Template matched with correlation {correlation} at ({x_offset},{y_offset})")
```
这段代码使用了OpenCV库中的`matchTemplate`函数来实现NCC模板匹配。该函数返回了一个矩阵,其中每个像素表示该位置与模板的相似度。我们通过寻找矩阵中的最大值来确定模板在图像中的位置。最后,我们可以计算出模板与图像的相对偏移,并返回相关系数作为匹配分数。
希望这能对你有所帮助。
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