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[M1z23R]

Again me....
I am making Motion Detection, and i have three picBox's, one for current preview, one for 'last frame' (5secs ago frame) and one for difference between those two.
Now, my camera and i belive every others gets picture (frame) with different brightness every time. When i use simple code to compare each pixel in first two image box's, only a few stay the same(10 out of 150*150). Other pixels are let's say 5% diffrent, darker or lighter. How could i fix this ?

Edit:
I even tried to check each pixel in one picture with 5 pixels in different picture (x,y)=(x,y)
(x,y)=(x+1,y)
(x,y)=(x,y+1)
(x,y)=(x,y-1)
(x,y)=(x-1,y)

Still not much difference.

[MrAksel]

You could have a threshold.

Code: Select all

   Dim Treshold As Byte = 5
   Dim rDifference As Byte = Math.Abs(OldRed - NewRed)
   Dim gDifference As Byte = Math.Abs(OldGreen - NewGreen)
   Dim bDifference As Byte = Math.Abs(OldBlue - NewBlue)
   If rDifference > Treshold Then
      'Red value has changed more than 5 pixels'
   End If
   If gDifference > Treshold Then
      'Green value has changed more than 5 pixels'
   End If
   If bDifference > Treshold Then
      'Blue value has changed more than 5 pixels'
   End If

Just edit the value of 'Threshold' to fit your needs. Larger values means that bigger changes are accepted, smaller values means that the pixels only have to change a little bit for it to accept.

[M1z23R]

I did exactly the same if you believe me
My function uses two colors, gets it's argb and gets difference between each (A,R,G,B) and if it's combined difference is less then 35 it returns that they are same.

Thank you btw, +rep you