I would like to ask that whether I can generate a vertical projection histogram and a horizontal histogram using labview?

[Greg_S-Video]

Hello kt lee:

Thank you very much for getting in touch with us!  I just thought I'd jump in here and provide a quick tip.  I'm not totally sure which image refers to which figure but I can say that all the speckles on the images are referred to as Salt & Pepper noise and you can effectively remove that using a Median filter. 

For more information, see the following links:

Median and Nth Order Filtering

http://zone.ni.com/devzone/cda/tut/p/id/2844

http://en.wikipedia.org/wiki/Median_filter#Edge_preservation_properties