# Rght

• 01-22-2003
spidereen
Rght
I am trying to do a Randimized Generalized Hough Transform. A document detailing this is available at
http://www.cse.cuhk.edu.hk/~pffung/p...ce/CPR1996.pdf

The problem I am having is in the first two steps of the algroithm

Hor-Mask = -1 -2 -3 -2 -1
0 0 0 0 0
1 2 3 2 1

After executing step 1. The image doesn't change much. Jusct a black line around the edge.

I know the code below is not great but I was just testing it. I would be greatful of any input.

int Matrix[3][5] = {-1,-2,-3,-2,-1,
0,0,0,0,0,
1,2,3,2,1};
int row;
int col;
int value;

for (row = 2; row < Image1->Height - 1; row++)
for (col = 1; col < Image1->Width - 2; col++)
{
value = Image1->Canvas->Pixels[col - 2][row - 1] * Matrix[0][0];
value =+ Image1->Canvas->Pixels[col - 1][row - 1] * Matrix[0][1];
value =+ Image1->Canvas->Pixels[col][row - 1] * Matrix[0][2];
value =+ Image1->Canvas->Pixels[col + 1][row - 1] * Matrix[0][3];
value =+ Image1->Canvas->Pixels[col + 2][row - 1] * Matrix[0][4];

value =+ Image1->Canvas->Pixels[col - 2][row + 1] * Matrix[2][0];
value =+ Image1->Canvas->Pixels[col - 1][row + 1] * Matrix[2][1];
value =+ Image1->Canvas->Pixels[col][row + 1] * Matrix[2][2];
value =+ Image1->Canvas->Pixels[col + 1][row + 1] * Matrix[2][3];
value =+ Image1->Canvas->Pixels[col + 2][row + 1] * Matrix[2][4];

Image2->Canvas->Pixels[col][row] = value;
}
• 01-22-2003
joshdick
Truthfully, I don't understand a darn thing about what it is you're saying, but something caught my eye in your code.
Code:

`value =+ Image1...`
I think you want to add the right hand side to value and store the whole shebang in value. If so, you want to use +=. The way your code is being interpreted by the computer is the + is a unary operator only operating on Image1. That might be your problem or I might be dead wrong. It's worth letting you know that, though. Good Luck.
• 01-22-2003
spidereen
Thanks.
That was one of my mistakes.

I'm sure there are many more.
• 01-22-2003
joshdick
My suggestion to you is to repost your revised code using code tags this time and ask a specific question. Hopefully then, someone more qualified than me could help you.