I want to get an image from the pi camera module and use the pillow imaging library to modify the image. The way I have been doing it up to now is to take a picture with the camera and then open that file using:
from PIL import Image
Im = Image.open("the file path")
That has worked well, but I don't want to save the image until I have modified it. is there a way of doing:
Im = camera.capture() #where Im is a PIL image
print(Im.width) # or any other PIL.Image property / method
Thanks
From the picamera docs (Section 4.3. Capturing to a PIL Image):
import io
import time
import picamera
from PIL import Image
# Create the in-memory stream
stream = io.BytesIO()
with picamera.PiCamera() as camera:
camera.start_preview()
time.sleep(2)
camera.capture(stream, format='jpeg')
# "Rewind" the stream to the beginning so we can read its content
stream.seek(0)
image = Image.open(stream)
Another way i do it is with OpenCv, you can also modify images with OpenCv such as draw images,
import cv2
import numpy as np
from PIL import Image
def cv2_to_pil(img): #Since you want to be able to use Pillow (PIL)
return Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
def pil_to_cv2(img):
return cv2.cvtColor(np.array(img), cv2.COLOR_RGB2BGR)
cam = cv2.VideoCapture(0) #Define the camera, 0 is which camera, if you have more than 1
ret_val, img = cam.read() #cam.read() returns ret (0/1 if the camera is working) and img,
#the actual image of the camera in a numpy array
cv2.imshow("Camera", img) #if you wanted to open a window to see this picture
cv2.waitKey(0) #waits for the enter key to continue, change to
#0 to X milliseconds to stop for a certain amount of time.
pil_img = cv2_to_pil(img) #convert the image to PIL so you can use it that way.
