Meaning of lengh in fspecial('motion',length,angle) ?

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dao 2016-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/312878-meaning-of-lengh-in-fspecial-motion-length-angle

评论： KSSV 2016-11-21

I am making program relating with motion blur. I read from guidance matlab: "length" is the length of blur in the picture but it doesn't say about the unit of this parameter. is it cm, mm or pixel ?

Please help me. Thank a lot

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Answer 1

KSSV 2016-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/312878-meaning-of-lengh-in-fspecial-motion-length-angle#answer_243806

It is mentioned in the document, Read this:

h = fspecial('motion', len, theta) returns a filter to approximate, once convolved with an image, the linear motion of a camera by len pixels, with an angle of theta degrees in a counterclockwise direction. The filter becomes a vector for horizontal and vertical motions. The default len is 9 and the default theta is 0, which corresponds to a horizontal motion of nine pixels.

length should is in pixels.

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dao 2016-11-21

Thank for your answer. In my small experiment, I create a blur picture by camera and compare it with a blur picture created by matlab. the problem is I cannot de-blur for captured picture by using deconvolution (deconv2)