Meaning of lengh in fspecial('​motion',le​ngth,angle​) ?

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

Answer 1

[KSSV]

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.

[dao]

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)

[KSSV]

My answer was specific to your question. You may open a new question, so that other experts can answer you. Good luck.