我在 C/C++ 版本中使用 OpenCV，但我指出的概念仍然有效。
OpenCV 常量CV_BGR2GRAY属于源文件中定义的枚举类型types_c.h：
/* 颜色转换常量 */
枚举{
CV_BGR2BGRA =0, CV_RGB2RGBA =CV_BGR2BGRA, CV_BGRA2BGR =1, CV_RGBA2RGB =CV_BGRA2BGR, CV_BGR2RGBA =2, CV_RGB2BGRA =CV_BGR2RGBA, CV_RGBA2BGR =3, CV_BGRA2RGB =CV_RGBA2BGR, CV_BGR2RGB =4, CV_RGB2BGR =CV_BGR2RGB, CV_BGRA2RGBA =5, CV_RGBA2BGRA =CV_BGRA2RGBA, CV_BGR2GRAY =6, CV_RGB2GRAY =7, CV_GRAY2BGR =8, CV_GRAY2RGB =CV_GRAY2BGR, CV_GRAY2BGRA =9, CV_GRAY2RGBA =CV_GRAY2BGRA, CV_BGRA2GRAY =10, CV_RGBA2GRAY =11, CV_BGR2BGR565 =12, CV_RGB2BGR565 =13, CV_BGR5652BGR =14, CV_BGR5652RGB =15, CV_BGRA2BGR565 =16, CV_RGBA2BGR565 =17, CV_BGR5652BGRA =18, CV_BGR5652RGBA =19, CV_GRAY2BGR565 =20, CV_BGR5652GRAY =21, CV_BGR2BGR555 =22, CV_RGB2BGR555 =23, CV_BGR5552BGR =24, CV_BGR5552RGB =25, CV_BGRA2BGR555 =26, CV_RGBA2BGR555 =27, CV_BGR5552BGRA =28, CV_BGR5552RGBA =29, CV_GRAY2BGR555 =30, CV_BGR5552GRAY =31, CV_BGR2XYZ =32, CV_RGB2XYZ =33, CV_XYZ2BGR =34, CV_XYZ2RGB =35, CV_BGR2YCrCb =36, CV_RGB2YCrCb =37, CV_YCrCb2BGR =38, CV_YCrCb2RGB =39, CV_BGR2HSV =40, CV_RGB2HSV =41, CV_BGR2Lab =44, CV_RGB2Lab =45, CV_BayerBG2BGR =46, CV_BayerGB2BGR =47, CV_BayerRG2BGR =48, CV_BayerGR2BGR =49, CV_BayerBG2RGB =CV_BayerRG2BGR, CV_BayerGB2RGB =CV_BayerGR2BGR, CV_BayerRG2RGB =CV_BayerBG2BGR, CV_BayerGR2RGB =CV_BayerGB2BGR, CV_BGR2Luv =50, CV_RGB2Luv =51, CV_BGR2HLS =52, CV_RGB2HLS =53, CV_HSV2BGR =54, CV_HSV2RGB =55, CV_Lab2BGR =56, CV_Lab2RGB =57, CV_Luv2BGR =58, CV_Luv2RGB =59, CV_HLS2BGR =60, CV_HLS2RGB =61, CV_BayerBG2BGR_VNG =62, CV_BayerGB2BGR_VNG =63, CV_BayerRG2BGR_VNG =64, CV_BayerGR2BGR_VNG =65, CV_BayerBG2RGB_VNG =CV_BayerRG2BGR_VNG, CV_BayerGB2RGB_VNG =CV_BayerGR2BGR_VNG, CV_BayerRG2RGB_VNG =CV_BayerBG2BGR_VNG, CV_BayerGR2RGB_VNG =CV_BayerGB2BGR_VNG, CV_BGR2HSV_FULL = 66, CV_RGB2HSV_FULL = 67, CV_BGR2HLS_FULL = 68, CV_RGB2HLS_FULL = 69, CV_HSV2BGR_FULL = 70, CV_HSV2RGB_FULL = 71, CV_HLS2BGR_FULL = 72, CV_HLS2RGB_FULL = 73, CV_LBGR2Lab = 74, CV_LRGB2Lab = 75, CV_LBGR2Luv = 76, CV_LRGB2Luv = 77, CV_Lab2LBGR = 78, CV_Lab2LRGB = 79, CV_Luv2LBGR = 80, CV_Luv2LRGB = 81, CV_BGR2YUV = 82, CV_RGB2YUV = 83, CV_YUV2BGR = 84, CV_YUV2RGB = 85, CV_BayerBG2GRAY = 86, CV_BayerGB2GRAY = 87, CV_BayerRG2GRAY = 88, CV_BayerGR2GRAY = 89, CV_YUV420i2RGB = 90, CV_YUV420i2BGR = 91, CV_YUV420sp2RGB = 92, CV_YUV420sp2BGR = 93, CV_COLORCVT_MAX =100 };
首先检查types_c.h头文件是否正确包含在库的源文件中：在我的 UNIX 系统上，我在 path 找到了它/usr/local/include/opencv2/imgproc/types_c.h。
如果它在那里，它可能只是您的编译选项中的一个问题：确保您正确包含和链接所有库文件。
就我而言，我使用以下内容指定了库的搜索路径：
-L/usr/local/lib-lopencv_core -lopencv_highgui显然包括编译器的库：
-I/usr/local/include/opencv如果它仍然不起作用，只需尝试调用cv::cvCvtColor()指定值 6 作为最后一个输入参数的函数（它是对应于枚举类型常量的intCV_BGR2GRAY）：
cvCvtColor(originalImage,grayImage, 6 );
关于你的第二个错误我不知道该说什么，这可能是由于我之前所说的相同问题。
检查解决第一个是否也解决了第二个。
并请在您的问题上付出更多的努力！
我认为这个常数是：org.opencv.imgproc.ImgProc.COLOR_BGR2GRAY
为什么不是 CV_BGR2GRAY 是 C 接口自动转换为 Java 的产物。
（如果您了解 OpenCV Java，那么这个问题非常清楚和相关。如果您不了解，为什么要发布 100 行关于 C/C++ 接口的内容并对提问者抱怨）。
这里“导入 org.opencv.imgproc.Imgproc”</p>
请将此静态参数导入您的 ActivityClass 文件的顶部。
导入静态 org.bytedeco.javacpp.opencv_imgproc.CV_BGR2GRAY；
您可以在此之后使用 CV_BGR2GRAY 。