Create picamera_component_plotter.py

plotting red, blue, and green (RGB) components of image taken by picamera

Author: josh-hrisko

picamera_component_plotter.py

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+import time
+from picamera import PiCamera
+import numpy as np
+import matplotlib.pyplot as plt
+
+t1 = time.time()
+h = 640 # change this to anything < 2592 (anything over 2000 will likely get a memory error when plotting
+cam_res = (int(h),int(0.75*h)) # keeping the natural 3/4 resolution of the camera
+cam_res = (int(16*np.floor(cam_res[1]/16)),int(32*np.floor(cam_res[0]/32)))
+cam = PiCamera()
+cam.resolution = (cam_res[1],cam_res[0])
+data = np.empty((cam_res[0],cam_res[1],3),dtype=np.uint8)
+x,y = np.meshgrid(np.arange(np.shape(data)[1]),np.arange(0,np.shape(data)[0]))
+cam.capture(data,'rgb')
+fig,axn = plt.subplots(2,2,sharex=True,sharey=True)
+fig.set_size_inches(9,7)
+axn[0,0].pcolormesh(x,y,data[:,:,0],cmap='gray')
+axn[0,1].pcolormesh(x,y,data[:,:,1],cmap='gray')
+axn[1,0].pcolormesh(x,y,data[:,:,2],cmap='gray')
+axn[1,1].imshow(data,label='Full Color')
+axn[0,0].title.set_text('Red')
+axn[0,1].title.set_text('Green')
+axn[1,0].title.set_text('Blue')
+axn[1,1].title.set_text('All')
+print('Time to plot all images: {0:2.1f}'.format(time.time()-t1))
+data = np.empty((cam_res[0],cam_res[1],3),dtype=np.uint8)
+plt.savefig('component_plot.png',dpi=150)
+plt.cla()
+plt.close()