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• Evolution #2269 : Prise en compte des variantes d’une langue

  8 septembre 2015, par Valéry -

  Notons au passage que ceci implique que #LANG donne un tag de langue complet incluant le subtag région

  • Cf. http://www.w3.org/International/articles/language-tags/

  Celui-ci est au passage exigé par le protocole OpenGraph :

  og:locale - The locale these tags are marked up in. Of the format language_TERRITORY. Default is en_US.

• Video from images in Python

  26 février 2018, par R. Patterson

  I can draw a series of images using plt.draw() and plt.pause() so it produces something similar to an animation in the python window. I have modified each of the images with various labels, drawings etc.

  import numpy as np
  
  from PIL import Image
  
  import matplotlib.pyplot as plt
  
  import math
  
  
  
  def display(Intensity):
  
      l = plt.Line2D(Intensity[0],Intensity[1],color='yellow') #draw ROI/IAL
  
      ax = plt.gca()
  
      ax.add_line(l)
  
      plt.axis('off')
  
      plt.pause(0.05)
  
      plt.draw()
  
      plt.clf()
  
  
  
  #rotate region of interest
  
  def rotate(origin,Intensity,increment):
  
      ox, oy = origin #coordinates of centre or rotation
  
      x_points=[]
  
      y_points=[]
  
      angle=math.radians(increment)#change in angle between each image
  
      for i in range(0,len(Intensity[0])):
  
          px, py = Intensity[0][i], Intensity[1][i]
  
          qx = ox+math.cos(angle)*(px-ox)-math.sin(angle)*(py-oy)
  
          x_points.append(qx)
  
          qy = oy+math.sin(angle)*(px-ox)+math.cos(angle)*(py-oy)
  
          y_points.append(qy)
  
      rotatecoordinates=[]
  
      rotatecoordinates.append(x_points)
  
      rotatecoordinates.append(y_points)
  
      return rotatecoordinates
  
  
  
  def animation(list, Intensity):
  
      inc=0
  
      for value in list:
  
          item = np.array(value)
  
          rotated=rotate([128,128],Intensity,inc)
  
          im=plt.imshow(item, interpolation='nearest')
  
          display(rotated)
  
          inc+=1
  
  
  
  Image_list=[]
  
  for i in range(0,50):
  
      array=np.linspace(0,1,256*256)
  
      mat=np.reshape(array,(256,256))
  
      img=Image.fromarray(np.uint8(mat*255),'L') #create images
  
      Image_list.append(img)
  
  
  
  myROI=([100,150,150,100,100],[100,100,150,150,100]) #region of interest on image
  
  animation(Image_list,myROI)

  I would like to produce a video file using the images produced. I can’t use the module imageio, imagemagick, opencv, cv2 etc. I think ffmpeg would work, I have the following code.

  def save():
  
      os.system("ffmpeg -r 1 -i img%01d.png -vcodec mpeg4 -y movie.mp4") 

  I don’t understand how to use it in relation to the code I already have. It doesn’t take any arguments, how would I relate it to the images I have ? I know how to use imagej/fiji to produce videos from images but I would like to do this in python and also it runs out of memory (I have a lot of images, over 2000). Any help would be appreciated, thank you.

• Revision 31957 : légère amélioration ... Un peu de documentation dans le code également

  7 octobre 2009, par kent1@… — Log

  légère amélioration ...
  Un peu de documentation dans le code également