OpenCV2 错误：(-215:Assertion failed) 'cv::resize' while training the model

Question

I am trying to train my model but I am getting below error. PFB code and error: Code: datasets.py

from numpy import * import csv import cv2 #import util

class C100Dataset: """ X is a feature vector Y is the predictor variable """ tr_x = [] # X (data) of training set. tr_y = [] # Y (label) of training set. ts_x = [] # X (data) of test set. ts_y = [] # Y (label) of test set. #filename='cifar100.csv' def init (self, filename): ## read the csv for dataset (cifar100.csv, cifar100_lt.csv or cifar100_nl.csv), # # Format: # image file path,classname

    ### TODO: Read the csv file and make the training and testing set
    ## YOUR CODE HERE
    
    with open(filename) as csvfile:
        reader = csv.reader(csvfile,delimiter=' ', quotechar='|')
        for row in reader:
            
            row[0] = row[0].replace('cifar100','./Downloads/dataset/')
            #try
            x = cv2.resize(cv2.imread(row[0]), dsize=(640, 480))
            
            x = transpose(x, (2, 0, 1))
            if 'train' in row[0].split('/'):
                self.tr_x.append(x)
                self.tr_y.append(row[1])
            else:
                self.ts_x.append(x)
                self.ts_y.append(row[1])

def getDataset(self):
    return [self.tr_x, self.tr_y, self.ts_x, self.ts_y]

Error:

OpenCV(4.5.2) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-4g0fenxj\opencv\modules\imgproc\src\resize.cpp:4051: error: (-215:Assertion failed).ssize:empty() in function 'cv::resize

Answer 1

Check that you are reading an image with cv2.imread(row[0]) . The .ssize.empty() indicates the src for cv2.resize is "empty." I can recreate this same error message with a simple test case

import cv2
cv2.resize(cv2.imread('foobar'), dsize=(640, 480))

cv2.error: OpenCV(4.5.2) C:\Users\...\opencv\modules\imgproc\src\resize.cpp:4051: error: (-215:Assertion failed) !ssize.empty() in function 'cv::resize'