image interpolation
in
Programming Questions
•
8 months ago
i would like to do bilinear interpolation on an image..I had the program in C, and I understand how it works but i dont know what to replace the unsigned char image_in[][] and image_out[][] as i dont know what this represent..The RGB of grayscale?? the intensity?? could someone help me..im noob at this..
- void scale(unsigned char image_in[Y_SIZE][X_SIZE], unsigned char image_out[Y_SIZE]
- [X_SIZE], float zx, float zy){
- int m,n;
- float x,y,p,q;
- int xs = X_SIZE/2;
- int ys = Y_SIZE/2;
- int d;
- for(int i=-ys; i<ys; i++){
- for(int j=-xs; j<xs; j++){
- y = i/zy;
- x = j/zx;
- if(y > 0) m= (int)y;
- else m = (int)(y-1);
- if(x > 0) n = (int)x;
- else n = (int)(x-1);
- q = y - m;
- p = x - n;
- if(q == 1) {q = 0; m = m + 1;}
- if(p == 1) {p = 0; n = n + 1;}
- if( (m >= -ys) && (m < ys) && (n >= -xs) && (n < xs) ){
- d = (int)((1.0-q)*((1.0-p)*image_in[m +ys][n +xs] + p*image_in[m +ys][n+1+xs]) + q*((1.0-p)*image_in[m+1+ys][n +xs] + p*image_in[m+1+ys][n+1+xs])); } else {
- d = 0;
- }
- if(d < 0) d = 0;
- if(d > 255) d = 255;
- image_out[i+ys][j+xs] = d;
- }
- }
- }
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