what is the difference between high pass and high boost filter

Hi,

Can anybody tell me what is the difference between high pass and high boost filter?

Thanks in advance

Answer 1

[Wayne King]

Hi Jim, normally what I have seen referred to as a high boost filter is when you take an image and possibly amplify it, then subtract from the amplified image a blurred (lowpass filtered) version of the image.

It is an image sharpening technique.

High pass filtering is when you simply apply a highpass filter to your image. A filter like this one for example:

   b = [
      0.2333   -0.4040    0.1083    0.0625
     -0.4040    0.6998   -0.1875   -0.1083
      0.1083   -0.1875    0.0502    0.0290
      0.0625   -0.1083    0.0290    0.0167];
   freqz(b)

[Jim]

Does the high boost filter removes blurrness from the image

I have a blurred image

You can see the image in the link below:

http://blur3232.blogspot.se/

Can I apply high boost filter to remove blurness from the image

Answer 2

[Sritej gunta]

the high boost filter amplifies the high frequency components and it keeps the low frequency components intact(almost).

it also enhances the edges and removes the blurred parts