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I am working with a python multiprocessing program with three processes. The first one captures images from a pyCamera module, the second one is a GUI and the third one does some simple image processing. I am trying to show the current image taken by the camera in a Qlabel. I don't need to have more than 10 fps, it could be even as slow as 1fps. But every time I use setPixmap it looks like the updated image takes too long to show.

class Ui_MainWindow(QtWidgets.QMainWindow):

 def __init__(self):
 super(Ui_MainWindow,self).__init__()
 uic.loadUi('/usr/local/bin/meltingPoints/GUI.ui',self)

 #variables that contain the captured image
 self.Gimage = mp.Array('B',768*1024*3,lock = mp.Lock())

 #Image update timer
 self.updateTimer = QtCore.QTimer()
 self.updateTimer.timeout.connect(self.update_labels)
 self.updateTimer.start(1000)

 def update_labels(self):
 #Reading the image from mp.Array
 self.Gimage.acquire()
 imageD = np.frombuffer(self.Gimage.get_obj(),dtype=np.uint8)
 self.Gimage.release()

 #Converting the image to Qimage
 imageD.shape = [768,1024,3]
 imageP = Image.fromarray(imageD[0:564,149:901,:].astype('uint8'), 'RGB')
 imageQ = ImageQt(imageP.resize((400,300)))

 #Setting Pixmap
 self.imageDisplay.setPixmap(QtGui.QPixmap.fromImage(imageQ))

 #Other simple label text updates go on after this

I do get an image in the Qlabel widget but instead of taking one second to update as the Timer configuration suggests, it takes about 5 seconds to show any change in the image. I have tried to use the OwnImageWidget shown here https://www.kurokesu.com/main/2016/08/01/opencv-usb-camera-widget-in-pyqt/ and it does update images on time, but the GUI gets unresponsive while the image update happens.

Any Ideas on what could be happening? I'll also include the function that captures the images (this function is called as a process in the main script and captures the image into two different multiprocessing arrays)

from time import sleep

import numpy as np
import picamera

def fotografo(Gimage,Oimage):
 #Configuracion y encendido de la camara
 with picamera.PiCamera() as camera:
 #Fotos en blanco y negro
 camera.color_effects = (128,128)
 #Resolucion maxima
 camera.resolution = (1024,768)
 #Cambio de los parametros para fotos consistentes
 camera.iso = 600
 sleep(2)
 camera.shutter_speed = camera.exposure_speed
 camera.exposure_mode = 'off'
 g = camera.awb_gains
 camera.awb_mode = 'off'
 camera.awb_gains = g

 Pic = np.empty((768*1024*3), dtype = np.uint8)

 while True:
 camera.capture(Pic,'rgb')
 Gimage[:] = Pic
 Oimage[:] = Pic
 sleep(0.25)

Thanks

unlucky_code