undistorted image has blurred boundary

[Tao Zhang]

Professor Scaramuzza:

 

I used a clip-on 180 degree fisheye lens on iphone and captured some checkerboard images and test image. After I used your toolbox to calibrate and undistort the image, I found the image quality at boundary is blurred, and may have color distortion. Is this blur or color distortion expected? What may cause them? I attached two files so you may have a look.

 

Thanks,

Tao

 

 

 

 

[Davide Scaramuzza]

Hi

There is no blur or color distortion in your images. What you call blur is a normal interpolation artifact typical in upsampling, due to warping a low resolution image (the borders) into a higher resolution one. The color distortion is due again to the fact that this warping emphasizes all the defects of smartphone cameras (ie, cheap color filter). 

Best

Davide

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<test.jpg>

<test-c.jpg>

[tanya....@gmail.com]

Hi Tao,
how did you get the undistorted image to not be cropped? Did you modify the undistort.m file or did you use your own mapping?

Thanks!

[andreas....@googlemail.com]

Hello everyone,

I have the same question. How can I rectify an image with undistort.m and can view the whole output view? As we can see in pciture test-c.jpg from Tao.

Looking forward to your answer - thanks!

Regards, Andreas