opencv 形状错误 [utils] 使图像和徽标一起出现

Question

i follow a tutorial to learn how to use opencv which and a practical library with tensorflow notably for the cnn but I have an error

Traceback (most recent call last): File "watermark.py", line 15, in <module> watermark = 
image_resize(logo, height=50) File "C:\Users\HP\Desktop\Private\project\cv\utils.py", line 9, in 
image_resize (h, w) = image.shape:2 AttributeError: 'NoneType' object has no attribute 'shape' WARN:0 
global C:\projects\opencv-python\opencv\modules\videoio\src\cap_msmf.cpp (674) 
SourceReaderCB::~SourceReaderCB terminating async callback

code utils.py

import cv2
import os
def image_resize(image, width = None, height = None, inter = cv2.INTER_AREA):
    dim = None
    (h, w) = image.shape[:2]
    if width is None and height is None:
        return image
    if width is None:
        r = height / float(h)
        dim = (int(w * r), height)
    else:
        r = width / float(w)
        dim = (width, int(h * r))
    resized = cv2.resize(image, dim, interpolation = inter)
    return resized
class CFEVideoConf(object):
    STD_DIMENSIONS =  {
        "360p": (480, 360),
        "480p": (640, 480),
        "720p": (1280, 720),
        "1080p": (1920, 1080),
        "4k": (3840, 2160),
    }
    VIDEO_TYPE = {
        'avi': cv2.VideoWriter_fourcc(*'XVID'),
        'mp4': cv2.VideoWriter_fourcc(*'XVID'),
    }

    width           = 640
    height          = 480
    dims            = (640, 480)
    capture         = None
    video_type      = None
    def __init__(self, capture, filepath, res="480p", *args, **kwargs):
        self.capture = capture
        self.filepath = filepath
        self.width, self.height = self.get_dims(res=res)
        self.video_type = self.get_video_type()
    def change_res(self, width, height):
        self.capture.set(3, width)
        self.capture.set(4, height)
    def get_dims(self, res='480p'):
        width, height = self.STD_DIMENSIONS['480p']
        if res in self.STD_DIMENSIONS:
            width, height = self.STD_DIMENSIONS[res]
        self.change_res(width, height)
        self.dims = (width, height)
        return width, height
    def get_video_type(self):
        filename, ext = os.path.splitext(self.filepath)
        if ext in self.VIDEO_TYPE:
          return  self.VIDEO_TYPE[ext]
        return self.VIDEO_TYPE['avi']

watermark.py

import numpy as np
import cv2
from utils import CFEVideoConf, image_resize
cap = cv2.VideoCapture(0)
save_path = 'saved-media/watermark.mp4'
frames_per_seconds = 24
config = CFEVideoConf(cap, filepath=save_path, res='720p')
out = cv2.VideoWriter(save_path, config.video_type, frames_per_seconds, config.dims)
img_path = 'images/logo/1.png'
logo = cv2.imread(img_path, -1)
watermark = image_resize(logo, height=50)
cv2.imshow('watermark',watermark)
while(True):
    ret, frame = cap.read()
    print(frame[50,150])
    color=(255,0,0)
    start_cord_x=50
    start_cord_y=150
    stroke=2
    w=100
    h=200
    end_cord_x=start_cord_x+w
    end_cord_y=start_cord_y+h
    cv2.rectangle(frame,(x,y),(end_cord_x,end_cord_y),color,stroke)
    cv2.imshow('frame',frame)
    if cv2.waitKey(20) & 0xFF == ord('q'):
        break
cap.release()
out.release()
cv2.destroyAllWindows()

thanks for helping me found the error the expected result is that the logo image 1.png when the camera turns on and the video download shows both the logo + the standard result

Answer 1

Here's your problem, you're reading an image from a non-existent file, hence the empty image that has no shape and is NoneType :

img_path = 'images/logo/1.png'
logo = cv2.imread(img_path, -1)