Spatial frequency is basically a measure of how detailed an image is.
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A good example of spatial frequency is right on your computer. Images on a computer screen are made up of pixels tiny dots of colored light. Pictures with higher spatial frequency in other words, more pixels crammed into every square inch are sharper and more detailed than pictures with lower spatial frequency. The tricky concept here is that different parts of your eye are actually "tuned in" to different spatial frequencies. Anything you look at has both high and low spatial frequency patterns, layered on top of each other—and what you see depends on how you look at it.
To get a sense of this, pick an object in the room, like a picture. Look at it out of the corner of your eye. It's kind of blurry, right?
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Now look straight at it. It snaps into focus. That's because you can see high spatial frequencies fine details with your central vision, but not low spatial frequencies broad, blurry patterns. The opposite is true of your peripheral vision the stuff outside the center of your gaze.
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The secret behind the Mona Lisa is that the "happy" part of her smile is actually buried in a low spatial frequency pattern. So if you're not looking directly at her mouth, her smile looks cheerful. But when you look directly at her smile, parts of it disappear into the background. As a result, you're never quite sure if she's smiling or not. If this is hard to understand, another kind of art might help. Find a painting that uses a lot of little dots or brushstrokes to make the picture anything by Claude Monet or George Seurat would work. The picture is actually clearer if you stand back or look at it a little off-center.
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To ask other readers questions about A Special Smile , please sign up. Lists with This Book. This book is not yet featured on Listopia. Community Reviews. Showing Rating details. Sort order. Jan 30, Sarah rated it it was amazing. I highly recommend this book for parents of children with clefts.
It answers questions little kids may have in simple terms - about how clefting happens, what was going on when they were a baby etc. Caution if you built close to the water! Practice first if you want to read this out loud to your kiddo, unless 'Why are you crying, mommy? Lastly, we found it very effective for the school nurse to read it to new class in the beginning of the school year, to pre-empt I highly recommend this book for parents of children with clefts.
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Lastly, we found it very effective for the school nurse to read it to new class in the beginning of the school year, to pre-empt nosy questions or teasing. Download our digital fundraising resources. Make your event stand out with a variety of Smile Train branded items. Our Student Fundraising Kit includes both educational resources and fundraising tips. Smile Train wedding favors can be customized and are available for download. The Baratto family's goal is to create new smiles. Join Dorothy and her family as they celebrate a special birthday with Smile Train. Hema is creating new smiles with the Young Leadership Circle.
For their 3rd birthday, help them bring smiles to children in need. Browse our existing ones to see how other people have helped create smiles. Contact us at community smiletrain.
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