[ WARN:0@0.009] global shadow_sift.hpp:15 cv::xfeatures2d::SIFT_create DEPRECATED: cv.xfeatures2d.SIFT_create() is deprecated due SIFT tranfer to the main repository. https://github.com/opencv/opencv/issues/16736

这个警告是由OpenCV库中的SIFT算法引起的。它告诉我们，SIFT_create()方法已被弃用，并且该算法已经从OpenCV的扩展库中移动到主库中。这是因为SIFT算法的专利权已经过期，现在可以在OpenCV的主要分支中使用。为了解决这个警告，您需要更新您的代码，以使用新的SIFT实现方式。

如果您正在使用Python，可以使用以下代码来创建新的SIFT实现：

sift = cv2.SIFT_create()

如果您正在使用C++，可以使用以下代码：

cv::Ptr<cv::SIFT> sift = cv::SIFT::create();

这样，您就可以避免这个警告，使用新的SIFT实现方式。

相关问题

[ WARN:0@1.442] global loadsave.cpp:244 cv::findDecoder imread_('./img/car3.jpg'): can't open/read file: check file path/integrity Traceback (most recent call last): File "D:\pythonProject1\testwork\caridentify3.py", line 711, in <module> gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) cv2.error: OpenCV(4.7.0) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

这个警告信息意味着在读取你的图片时，OpenCV库无法找到该文件或者无法正确读取该文件。你需要检查图片路径是否正确，以及文件是否存在。此外，你还可以使用绝对路径或者相对路径来确保代码能够正确找到图片。如果图片路径正确但依然出现错误，可能是图片格式不受OpenCV支持，你可以尝试将图片转换为其他格式再重新读取。

[ WARN:0@0.370] global loadsave.cpp:244 cv::findDecoder imread_('4.jpeg'): can't open/read file: check file path/integrity

As an AI language model, I do not have access to the context of the error message. However, the error message seems to indicate that there is an issue with the file path or the integrity of the file "4.jpeg". The imread() function is unable to open/read the file, which suggests that the file may not exist or the path to the file may be incorrect. You may want to double-check the file path and ensure that the file exists in the specified location. Additionally, you can try opening the file manually to ensure that it is not corrupted or damaged.