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WeChat 或 QQ 图标检测.
任务: 从图像中检测出 WeChat 或 QQ 图标的位置.
方法: 基于 OpenCV 库, 通过 SIFT 或 SURF 图像特征作检测.
由于 SURF 和 SIFT 算法有专利限制,
其安装环境是:
python==3.6.5
opencv-contrib-python==3.4.2.16
由于 huggingface 的 space 中的 python 为 3.10 版本, 已无法安装此 opencv 库.
你也可以在这里找到相关代码, 但这个库已经不再维护了.
https://github.com/tianxing1994/OpenCV/
dir: 练习实例 -> SIFT_SURF 图像特征作目标检测(在图片中检测出 QQ 图标的位置)
因此将实现方法记录如下:
实现步骤:
(1)采用 opencv 库的 SIFT 或 SURF 图像特征 cv.xfeatures2d.SIFT_create() 对目标区域生成特征点向量.
(2)为减少特征点数量, 对所有的特征点向量做聚类, 将聚类中心作为特征点, 得到 template_descriptors.
(3)计算目标图像中的所有 SIFT 或 SURF 图像特征点. 得到 scene_descriptors.
(4) 采用 flann.knnMatch 方法进行特征点匹配, (如果最近匹配距离比第二匹配距离的 0.7 倍还要小, 则认为这个点是 good_match, 即认为好的特征点具有独特征, 不会有其它更相似的点).
(5)最小要有3个 good_match 才认为图标匹配成功.
(6)最后根据 good_match 点的分布计算图标的中心, 我的做法是计算点集中心和平均距离, 将大于平均距离的点丢弃, 重复此过程, 直到半径小于阈值.
涉及到的方法有:
import cv2 as cv
sift = cv.xfeatures2d.SIFT_create()
index_params = dict(algorithm=0, trees=5)
search_params = dict(checks=50)
flann = cv.FlannBasedMatcher(index_params, search_params)
keypoints, descriptors = sift.detectAndCompute(image, None)
matches = flann.knnMatch(
queryDescriptors=template_descriptors,
trainDescriptors=scene_descriptors,
k=2
)
good_matches = []
for m, n in matches:
if m.distance < 0.7 * n.distance:
good_matches.append(m)
k = 3
if len(good_matches) > k:
print(good_matches)
else:
print("Not enough matches are found - %d/%d" % (len(good_matches), k))
参考链接:
https://docs.opencv.org/3.0-beta/index.html
bbox 对应类别 category 的文字为:
CATEGORIES = [
"红黑白QQ图标", "绿边白色微信图标", "淡蓝底全白QQ图标",
"绿底全白微信图标", "大绿小白微信图标", "纯色微信图标", "纯色QQ图标"
]
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