TOC
How to Read a Image in Python
There are three ways to read a image, the codes is showing below.
image_path = "fasterRCNN/faster-rcnn-keras-master/img/street.jpg";
from PIL import Image
import numpy as np
image = Image.open(image_path) # RGB
tmp_image = np.array(image)
print("PIL open shape:",tmp_image.shape, tmp_image)
# load with cv2
import cv2
image = cv2.imread(image_path) # mode: BGR
print("cv2 imread shape:", image.shape) # (width,height,channel)
# load with matplotlib
import matplotlib.image as mpimg
image = mpimg.imread(image_path) # mode: RGB
print("matplotlib imread shape:",image.shape, image) # ( height, width,channel(RGB) )
If you use cv2 to load a image , then show it with matplotlib, you should convert the image to RGB mode, this is because cv2 read a image in BGR mode, while matplotlib presents the image in RGB mode;
For example:
import cv2
image = cv2.imread(image_path) # mode: BGR
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB) # BGR to RGB
from matplotlib import pyplot as plt
plt.imshow(image) # it will present normally.
plt.show()
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