Voices, like the one Stephen Hawking used) to read out the words on a screen soīlind and visually impaired people can understand them. Machine-readable text can also be decodedīy screen readers, tools that use speech synthesizers (computerized
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ZIP file and store it in much less space, send it by email-and all Word processor, incorporate it into a Web page, compress it into a You can search through itīy keyword (handy if there's a huge amount of it), edit it with a Once a printed page is in this machine-readable text form, you can doĪll kinds of things you couldn't do before. Like a TXT or DOC file from a scanned JPG of a printed or handwritten Picture of text into text itself-in other words, producing something The page rather than the text itself-it can't read the words on the In other words, the computer has a picture of Of pixels (the colored dots or squares that make up anyĬomputer graphic image). Taj Mahal or any other graphic: it's a completely meaningless pattern Graphic file (often in the form of a JPG) and, as far as a computer'sĬoncerned, there's no difference between it and a photograph of the Something like the page of an old book, you have to present it withĪn image of that page generated with an optical Problem is that a computer has no eyes, so if you want it to read Out what I'm trying to say (sometimes by reading individualĬharacters but mostly by scanning entire words and whole groups ofĬomputers can do this too, but it's really hard work for them. Marks) printed on the screen and your brain is using those to figure The characters (letters, numbers, and things like punctuation Your eyes are recognizing the patterns of light and dark that make up Photo: When it comes to optical character recognition, our eyes and brains are far superior toĪs you read these words on your computer screen, your eyes and brain areĬarrying out optical character recognition without you even noticing! If the ink were slightly more faded, the gray and white pattern of fibers would start to interfere and make the letters even harder to recognize. And notice how the fibers in the paper are introducing some confusion into the image. Photo: Recognizing characters: To you and me, it's the word "an", but to a computer this is just a meaningless pattern of black and white. The gigantic mail-sorting machines that ensure all those millions
Of everything from handwriting analysis programs on cellphones to
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Software (program) that can automatically analyze printed text and turn it intoĪ form that a computer can process more easily. Old-fashioned printed book or a letter scribbled with aĬomputers have to work much harder. It comes to processing more human kinds of information, like an Their way-we have to "talk" to them through relatively crude devices such as keyboardsĪnd mice so they can figure out what we want them to do. Vitally important that machines and humans can understand one anotherĪnd pass information back and forth. Then, that you're not working for the US Postal Service, which has toĭecode and deliver something like 30 million handwritten envelopesĮvery single day! With so much of our lives computerized, it's Last updated: May 11, 2021.ĭo you ever struggle to read a friend's handwriting? Count yourself lucky,
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