March 2025
Intermediate to advanced
352 pages
9h 37m
Spanish
Content preview from Web Scraping con Python, 3.ª edición
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Capítulo 16. Tratamiento de imágenes y reconocimiento de textos
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Desde los coches autoconducidos de Google hasta las máquinas expendedoras que reconocen la moneda falsa, la visión artificial es un campo enorme con objetivos e implicaciones de gran alcance. Este capítulo se centra en un pequeño aspecto de este campo: el reconocimiento de texto; en concreto, en cómo reconocer y utilizar imágenes basadas en texto que se encuentran en Internet utilizando diversas bibliotecas de Python .
Utilizar una imagen en lugar de texto es una técnica habitual cuando no quieres que el texto sea encontrado y leído por los robots. Esto se ve a menudo en los formularios de contacto, cuando una dirección de correo electrónico se representa parcial o totalmente como una imagen. Dependiendo de la habilidad con que se haga, puede que ni siquiera sea perceptible para los espectadores humanos, pero los robots tienen dificultades para leer estas imágenes, y la técnica es suficiente para impedir que la mayoría de los spammers adquieran tu dirección de correo electrónico.
Los CAPTCHAs, por supuesto, se aprovechan de el hecho de que los usuarios pueden leer imágenes de seguridad, pero la mayoría de los robots no. Algunos CAPTCHAs son más difíciles que otros, una cuestión que abordaremos más adelante en este libro.
Pero los CAPTCHA no son el único lugar de la web donde los raspadores necesitan ...
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