Bow trainers error add images features: cv2. Error: error: (215)-CodePudding

Recently I want to learn to create an object detector, but run when an error occurs, the code refer to the "OpenCV3 computer vision Python language to realize the second edition" chapter 7 of the code, Python version for 3.5.4, opencv version 3.3.0, code is as follows:

 import cv2 
The import numpy as np 
The from OS. Path import join 

# placeholder path 
Datapath="trainimages/" 
Def path (CLS, I) : 
Return % d.p gm/" % s % s "% (datapath, CLS, I + 1) 

Pos and neg="pos", "neg" 

Detect=cv2. Xfeatures2d. SIFT_create () 
Extract=cv2. Xfeatures2d. SIFT_create () 

Flann_params=dict (algorithm=1, trees=5) 
The matcher=cv2. FlannBasedMatcher (flann_params, {}) 

Bow_kmeans_trainer=cv2. BOWKMeansTrainer (40) 
Extract_bow=cv2. BOWImgDescriptorExtractor (extract, the matcher) 

Def extract_sift (fn) : 
Im=cv2. Imread (fn, 0) 
Return extract.com pute (im, detect detect (im)) [1] 

For I in range (8) : 
Bow_kmeans_trainer. Add (extract_sift (path (pos, I))) 
Bow_kmeans_trainer. Add (extract_sift (path (neg, I))) 

Voc=bow_kmeans_trainer. Cluster () 
Extract_bow. SetVocabulary (voc) 

Def bow_features (fn) : 
Im=cv2. Imread (fn, 0) 
Return extract_bow.com pute (im, detect detect (im)) 

Traindata, trainlabels=[], [] 
For I in range (20) : 
Traindata. The extend (bow_features (path (pos, I))); Trainlabels. Append (1) 
Traindata. The extend (bow_features (path (neg, I))); Trainlabels. Append (1) 

The SVM=cv2. Ml. SVM_create () 
SVM. "train" (np) array (traindata), cv2. Ml. ROW_SAMPLE, np, array (trainlabels)) 

Def predict (fn) : 
F=bow_features (fn); 
P=SVM. Predict (f) 
Print (fn, "\ t", p [1] [0] [0]) 
The return p 

# again placeholder paths 
Car, notcar="xxmd3, JPG", "no. JPG" 
Car_img=cv2. Imread (car) 
Notcar_img=cv2. Imread (notcar) 
Car_predict=predict (car) 
Not_car_predict=predict (notcar) 

The font=cv2. FONT_HERSHEY_SIMPLEX 

If (car_predict [1] [0] [0]==1.0) : 
Cv2. PutText (car_img, 'Detected, (10, 30), the font, 1, (0255, 0), 2, cv2. LINE_AA) 

If (not_car_predict [1] [0] [0]==1.0) : 
Cv2. PutText (notcar_img, "Not Detected", (10, 30), the font, 1, (0, 0, 255), 2, cv2. LINE_AA) 

Cv2. Imshow (' BOW + SVM Success, car_img) 
Cv2. Imshow (' BOW + Failure SVM, notcar_img) 
Cv2. WaitKey (0) 
Cv2. DestroyAllWindows ()

When running error:
Traceback (the most recent call last) :
The File "G: \ python test demo \ test1012 \ text py", line 26, in & lt; module>
Bow_kmeans_trainer. Add (extract_sift (path (pos, I)))
Cv2. Error: D: \ Build \ OpenCV \ OpenCV - 3.3.0 \ modules \ features2d \ SRC \ bagofwords CPP: 55: error: (215). _descriptors. Empty () function in CV: : BOWTrainer: : add
I can't find bagofwords on disk d., CPP file path does not exist, the back of the error also look not to understand, to obtain a great god help to look at, what specific error in the wrong place, thank you very much!!!!!

CodePudding user response:

Pos and neg="pos", "neg" a "-" symbols

CodePudding user response:

Bow_kmeans_trainer. Add (extract_sift (path (pos, I))) of the output to None, mainly function bow_kmeans_trainer how to do?

CodePudding user response:

Can look at this article https://blog.csdn.net/qq_40456669/article/details/104198516