import numpy as np
from PIL import Image

def cvtColor(image):
    if len(np.shape(image)) == 3 and np.shape(image)[2] == 3:
        return image 
    else:
        image = image.convert('RGB')
        return image 

def resize_image(image, size, letterbox_image):
    iw, ih  = image.size
    w, h    = size
    if letterbox_image:
        scale   = min(w/iw, h/ih)
        nw      = int(iw*scale)
        nh      = int(ih*scale)

        image   = image.resize((nw,nh), Image.BICUBIC)
        new_image = Image.new('RGB', size, (128,128,128))
        new_image.paste(image, ((w-nw)//2, (h-nh)//2))
    else:
        new_image = image.resize((w, h), Image.BICUBIC)
    return new_image

def preprocess_input(image):
    image /= 255.0
    return image