how can i smooth my line into a line in 1 pixel border with c#

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C#

algorithm

image-processing

i have a table that i want recognize all row and column and extract all content of my table but i have a problem with selecting table
for example:
my code get first point of my table in top left and also get last point of my table in bottom right and extract rectangle
but when i scan my paper ,my table line have noise and can not get exact first and last point
what should i do?

i use from code in Image Processing for Dummies with C# and GDI+ Part 6 - The HSL color space[^] and with EdgeDetectHomogenity filter , my line were better but i want line in one column with same index in array

0 is black border of my table

like this

255 255 255 255 0 255 255 255
255 255 255 255 0 255 255 255
255 255 255 255 0 255 255 255
255 255 255 255 0 255 255 255
255 255 255 255 0 255 255 255

not this

255 255 255 255 0 255 255 255
255 255 255 0 255 255 255 255
255 255 255 0 255 255 255 255
255 255 255 255 0 255 255 255
255 255 255 255 255 0 255 255
255 255 255 255 0 255 255 255

how can i move all 0 or black pixel to one column ?

thanks for your help