how to apply vertical and horizontal projection?

[GeniusIDS]

Dears,

I hope that anyone can help me to solve this problem...

I need to apply vertical projection on image that contain a vehicle with plate to determine the propably location of the car plate.

please find the attached 2 images 17.jpg is image which i want to apply horizontal projection, v-h[projection].png is what i want to do like it

thank...

[BruceAmmons · Accepted solution]

Looks like IMAQ LinearAverages to me.  If you multiply the averages by the number of rows or columns, you will get the count for a binary image.

Bruce

[GeniusIDS]

Thanks BruceAmmons

That solve one of my question, Sobel edge detection find all edges in the image. i want to seperate the vertical edges from horizontal edges.

Thanks ,,,,,

[Klemen]

Hello,

if you want to seperate vertical and horizontal approximations of the derivatives, use linear filter (IMAQ Convolution operator), specifying two different convolution kernels - one for vertical and another for horizontal direction.

For example, see here:

http://forums.ni.com/t5/Machine-Vision/creating-double-precision-image-from-uint8/m-p/2796260#M41746

Best regards,

K

[GeniusIDS]

Thanks Klemen

Im trying to find way to extract car plate from image

i use gaussian -> Sobel -> detect rectangle but accuracy not good

i use gaussian -> match pattern but the pattern not available in all images

i use sobel -> binary -> vertical/ horizontal projection not all edges detected

please if  you can share with me some techniques it will be good for me

Thanks