def get_patches(filepath,patch_size,crop_sizes,save_dir=None):
    '''This functions creates and return patches of given image with a specified patch_size, if save_dir is given patches are saved to the directory'''
    image = cv2.imread(filepath) 
    filename=filepath.split('/')[-1].split('.')[0]
    height, width , channels= image.shape
    patches = []
    for crop_size in crop_sizes: #We will crop the image to different sizes
        crop_h, crop_w = int(height*crop_size),int(width*crop_size)
        image_scaled = cv2.resize(image, (crop_w,crop_h), interpolation=cv2.INTER_CUBIC)
        for i in range(0, crop_h-patch_size+1, patch_size):
            for j in range(0, crop_w-patch_size+1, patch_size):
              x = image_scaled[i:i+patch_size, j:j+patch_size] # This gets the patch from the original image with size patch_size x patch_size

              if save_dir!=None:  #If save_dir is specified we will save the patches to the given directory
                if not os.path.exists(save_dir):
                  os.mkdir(save_dir)
                pactch_filepath=save_dir+'/'+filename+''+str(crop_h)+''+str(i)+'_'+str(j)+'.jpg'# Creating a distinct patch filename
                cv2.imwrite(pactch_filepath,x) # Saving the  image to the path

              patches.append(x)
    return patches

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