Alexandre Gonçalves Silva Roberto de Alencar Lotufo Rubens Machado Toolbox of Image Processing for Numerical Python. 402 2001 conf/sibgrapi/2001 SIBGRAPI http://dlib2.computer.org/conferen/sibgrapi/1330/pdf/13300402.pdf db/conf/sibgrapi/sibgrapi2001.html#SilvaLM01