hi there,
i need help in desiigning a low pass filter to capture NTSC signals i am using this to compare two images.

 

Are you trying to remove some signal elements? Filters alter the signal, but do not capture parts of it.

 

i am trying to analyse signals to distinguish betweem rows in a farm, after it has been ploughed...
To find out a missing row when the farmer is sowing seeds.

 

Perhaps you could give us more of a idea of how you are going to do the analysis.