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• matplotlib.animate saves only one still frame

  22 août 2015, par dim_voly

  EDIT

  Changed the presented code so that another person can take it away and reproduce the error. The data for the below code can be found here, including the code and the animation produced.

  import os
  
  import numpy as np
  
  import matplotlib as mpl
  
  mpl.use("Agg")
  
  import matplotlib.pyplot as plt
  
  import matplotlib.animation as animation
  
  
  
  
  
  if __name__ == '__main__':
  
      print "Plotting Clevis LVDT Displacements"
  
      os.chdir(r"F:\BrokenAnimation")
  
      animation_data = np.loadtxt("animation_data.csv", delimiter=",")
  
      time = animation_data[:,0] 
  
      L10 = animation_data[:,1]
  
      L11 = animation_data[:,2]
  
      L12 = animation_data[:,3]
  
  
  
      def data_gen():
  
          t = data_gen.t
  
          cnt = 0
  
          L10_iter = data_gen.L10_iter
  
          L11_iter = data_gen.L11_iter
  
          L12_iter = data_gen.L12_iter
  
          while cnt < 35000:
  
              cnt+=1
  
              t += 10.0
  
              yield [-10.25, L10_iter.next()], [10.1875, L11_iter.next()],
  
                    [L12_iter.next(), -9.0] 
  
      data_gen.t = 0
  
      data_gen.L10_iter = iter(np.array(L10))
  
      data_gen.L11_iter = iter(np.array(L11))
  
      data_gen.L12_iter = iter(np.array(L12))
  
  
  
      fig, ax = plt.subplots()
  
      scat = ax.scatter([0.0, 0.0, 0.0], [0.0, 0.0, 0.0])
  
  
  
      ax.set_xlim(-15, 15)
  
      ax.set_ylim(-10.0, 0.5)
  
      ax.set_ylim(-0.5, 0.5)
  
      ax.grid()
  
  
  
  
  
      def run(data):
  
          # update the data
  
          x, y, z = data
  
          scat.set_offsets([x, y, z])
  
          return scat,
  
  
  
      ani = animation.FuncAnimation(fig, run, data_gen,
  
                                    blit=True, interval=40, # 40msec? implying 25fps?
  
                                    )
  
  
  
      # This works
  
      plt.show()
  
  
  
      # Doesn't really save what I see in plt.show()
  
      ani.save('South_Clevis.mp4') # 435kb file 4 sec long, 25 fps 800x600 887Kbps

  I’m trying to plot a time history of the displacements of the dots below :

  

  The dots at y = 0.0 are the original positions and the animation moves the dots up and down. For context, the dots represent LVDT displacements over a time history of 35,000 sec with a sample rate of 1 per second. So each "second" the plot should be updated.

  Bitrate does not appear to be a keyword that actually does anything. I have ffmpeg installed and it is on the Windows path. Using the basic writer example (but without the line matplotlib.use("Agg"), because python complained) works fine and produces an animation that can be played back.

• How to import the CascadeClassifier module from Opencv ?

  22 juillet 2015, par kylel95

  This porgram is to detect faces in the specified image. I have opencv and ffmpeg properly installed. Also, when I check the file path to see if CascadeClassifer was there, indeed it was. I somehow, still received the error :
  AttributeError : ’module’ object has no attribute ’CascadeClassifer’. I was thinking maybe it should not be called using ’cv2.CascadeClassifier’ and maybe something more lengthy. Thank you

  import cv2
  
  import numpy as np
  
  
  
  face_cascade = cv2.CascadeClassifer('haarcascade_frontalface_default.xml')
  
  eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
  
  
  
  image = cv2.imread('image.png')
  
  gray = cv2.cvtColor(image, cv2.COLOR_RGB2GRAY)
  
  
  
  faces = face_cascade.detectMultiScale(gray, 1.3, 5)
  
  for (x,y,w,h) in faces:
  
     cv2.rectangle(image,(x,y),(x+w,y+h), (225,0,0),2)
  
     roi_gray = gray[y:y+h, x:x+w]
  
     roi_color = image[y:y+h, x:x+w]
  
     eyes = eye_cascade.detectMultiScale(roi_gray)
  
     for (ex,ey,ew,eh) in eyes:
  
         cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)
  
  
  
  cv2.imshow('Imgae', image)
  
  cv2.waitKey(0)
  
  cv2.destroyAllWindows()

• FFMPEG - How to get a blur effect, without altering the color white ?

  17 août 2016, par Hugo

  I need a picture, with blur effect background. I found the code works, but, the white color of the photos is lost ( only happens with white color)...

  Step1 : ffmpeg -i eyes.jpg -s 640x360 -qscale 1 bg.jpg
  Step2 : ffmpeg -i bg.jpg -filter_complex "[0:v]crop=640:360:0:0,boxblur=20[fg] ;[0:v][fg]overlay=0:0[v]" -map "[v]" -qscale 1 bg.jpg -y
  Step3 : ffmpeg -i bg.jpg -i eyes.jpg -filter_complex "overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2" -qscale 1 result.jpg
  

  Original photo :
  see original photo

  Result (white color is lost)
  see result photo

  Please I need help (The white color should remain).

  Thank you very much,
  Greetings,
  Hugo