当我尝试运行我的代码时，这个错误实际上是什么意思我遇到了错误，代码下面提到的错误

Question

这是我遇到问题的代码，我在名为 rohith 的库中编写了几个函数（代码末尾提供了链接，请随时下载）

        import cv2
        import rohith
        import numpy as np
        videoPath = 'project_video.mp4'
        cap = cv2.VideoCapture(videoPath)

        def lane_tracking(img, lines):
            copy_image= np.copy(img)
            merginig_img = np.zeros((img.shape[0],img.shape[1],3),
                                  dtype = np.uint8)
            for line in lines:
                for x1,y1,x2,y2 in line:
                    cv2.line(merginig_img,(x1,y1),(x2,y2),(10,255,255),
                             thickness=4)

            merged_img =cv2.addWeighted(copy_image,
                                        0.8,
                                        merginig_img,
                                        1,
                                        0.0)
          ''merging the lane detected image(which includes only roi) with original image(frame)''
            return  merged_img

        while(True):


             ret,frame = cap.read()

             processed_image = rohith.preprocess(frame)

             width = processed_image.shape[0]
             height = processed_image.shape[1]

             region_of_interest_vertices = [
                  (0, width), (height / 2, width / 2), (height, width)
             ]

             gray_scale = cv2.cvtColor(processed_image,cv2.COLOR_BGR2GRAY)
             edge_detection = cv2.Canny(gray_scale, 55, 150)               
             cropped_image=rohith.region_of_interest(edge_detection,
                                      np.array([region_of_interest_vertices],
                                      np.int32))



             lane_tracking1 = cv2.HoughLinesP(cropped_image,
                                             rho=6, theta=np.pi / 60,
                                             threshold=160,
                                             lines=np.array([]),
                                             minLineLength=40,
                                             maxLineGap=25)

             line_added_img = lane_tracking(processed_image,lane_tracking1)



             cv2.imshow('edge detected image with only lanes',cropped_image)
             cv2.imshow('video_with_lane_lines', line_added_img)



             if cv2.waitKey(1) & 0xFF == ord('p'):
                 break
        cap.release()
        cv2.destroyAllWindows()

1. ///在我尝试运行时遇到代码错误之后，我正在使用 pycharm 在 python 中运行我的代码（链接到 rohith 库------->>>> https://drive.google.com/file/d/1TKXwGcBZXKS5Y3n9aXze5TVVjaOc9kB6/view?usp=sharing）

           Traceback (most recent call last):
           File 
          "C:/Users/dell/PycharmProjects/lane_detection/test02.py",line28,
           in <module>
           processed_image = rohith.preprocess(frame)
           File "C:\Users\dell\PycharmProjects\lane_detection\rohith.py", 
           line 5, in
           preprocess
           filtering = cv2.GaussianBlur(frame, (5,5),0)
           cv2.error: OpenCV(4.1.2) C:\projects\opencv- 
           python\opencv\modules\core\src\matrix.cpp:757:
           error: (-215:Assertion failed) dims <= 2 && step[0] > 0 in 
           function
           'cv::Mat::locateROI'
           Process finished with exit code 1
   

Answer 1

原因是该函数提供的图像比预期的要小。调整图像大小解决了这个问题。