Open-Cv dnn error for python while using Yolov3. Using open-cv ver(4.2.0)

Question

cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\dnn\src\darknet\darknet_io.cpp:677: error: (-212:Parsing error) Unknown layer type: in function 'cv::dnn::darknet::ReadDarknetFromCfgStream

Code:


import cv2
import numpy as np

# Load Yolo
path =r"D:\yolov3-coco"
weight = path+r"\yolov3.weights"
cfg = path+r"\yolov3.cfg"
net = cv2.dnn.readNetFromDarknet(weight ,cfg )
classes = []
with open(path+"\coco.txt", "r") as f:
    classes = [line.strip() for line in f.readlines()]
print(cfg)
print(weight)
print(classes)



cv2.destroyAllWindows()

I have already used the command net= cv2.dnn.readNet(weights,cfg) but it did not work i have also gone to https://pjreddie.com/media/files/yolov3.weights and downloaded the weights and config files and have put them in a folder called yolov3-coco.

score 2 · Answer 1 · answered Jun 25 '21 at 04:27

2

For me it were the wrong files. I was trying it in google colab with version 2.5.0 of tensorflow. The following files worked:

!wget "https://pjreddie.com/media/files/yolov3.weights"

!wget "https://raw.githubusercontent.com/pjreddie/darknet/master/cfg/yolov3.cfg"

!wget "https://raw.githubusercontent.com/pjreddie/darknet/master/data/coco.names"

answered Jun 25 '21 at 04:27

RAJESH CHANDRAS

36
3

This worked for me. Looks like the cfg and weights can be incompatible with each other if downloaded from different projects. Thanks Rajesh! – Piyush Shandilya Aug 18 '23 at 11:03

score 0 · Answer 2 · answered May 23 '20 at 10:56

0

Maybe yolo3-coco cfg and weight do not match so Unknown layer type error.

answered May 23 '20 at 10:56

kaankucuk

19
6

I downloaded it from a prescribe link and i checked it , can you prescribe an links that you may know of – Bezal-el May 23 '20 at 14:48

score 0 · Accepted Answer · answered May 23 '20 at 11:17

0

You seem to be passing *.weights first and *.cfg later. If takes *.cfg first, then the darknet weights file. Reference for readNetFromDarknet,

https://docs.opencv.org/master/d6/d0f/group__dnn.html#gafde362956af949cce087f3f25c6aff0d

This problem is similar to,

YOLO V3 Video Stream Object Detection

answered May 23 '20 at 11:17

B200011011

3,798
22
33

net = cv2.dnn.readNetFromDarknet(cfg ,weight ) cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\dnn\src\darknet\darknet_io.cpp:677: error: (-212:Parsing error) Unknown layer type: in function 'cv::dnn::darknet::ReadDarknetFromCfgStreamI get same error – Bezal-el May 23 '20 at 14:42
Changing to `net = cv2.dnn.readNetFromDarknet(cfg, weight)` and file path works on my machine. I have tested with https://pjreddie.com/darknet/yolo/, yolov3 weights and config without any error on OpenCV 4.3.0. – B200011011 May 23 '20 at 16:10
This change did not seem to have effect on my computer i think my version of opencv may be incompatible or the library may be incomplete . I made sure to download the latest version of open-cv but i see no avail. So i have used tensorflow lite interpreter for the yolov3 instead – Bezal-el Aug 02 '20 at 16:36

score 0 · Answer 4 · answered Mar 01 '21 at 14:16

0

Path for yolov3.weights,yolov3.cfg is not proper so you can pass path directly where they are stored

net = cv.dnn.readNetFromDarknet("yolov3-coco/yolov3.cfg", "yolov3-coco/yolov3.weights")

answered Mar 01 '21 at 14:16

Mohit Verma

56
1
6

score 0 · Answer 5 · edited May 04 '22 at 20:37

0

try to use OpenCV --version 5. My error was solved with this.

edited May 04 '22 at 20:37

Leonardo Alves Machado

2,747
10
38
53

answered Apr 27 '22 at 18:31

Mubahsir

45
9

score 0 · Answer 6 · answered Nov 07 '22 at 09:51

0

ı had trouble problem like this. Just check your code path and make sure where cfg,weights are,open main folder and work under the main folder.

answered Nov 07 '22 at 09:51

Mehmet Bilgehan AVCI

1

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Nov 10 '22 at 05:41

Open-Cv dnn error for python while using Yolov3. Using open-cv ver(4.2.0)

6 Answers6