Changeset 617

Timestamp:

02/17/10 11:44:49 (5 months ago)

Author:

anthony_rowe

Message:

added interger yuv conversion

Files:

• trunk/projects/cmucam1/ppm-fd/yuv2rbg.c (modified) (3 diffs)

trunk/projects/cmucam1/ppm-fd/yuv2rbg.c

@@ -2 +2 @@
 #include <stdlib.h>
 
+int clip(int x)
+{
+if(x>255) x=255;
+if(x<0) x=0;
+return x;
+}
 
 int main()
@@ -7 +13 @@
 FILE *fp,*out_fp,*mono_fp;
 int x,y,x_size,y_size,depth;
-int yc,uc,vc,r,g,b;
+int yc,uc,vc,r,g,b,C,D,E;
 char type[32];
 
@@ -30 +36 @@
         //g = 1.164*(yc - 16) - 0.813*(vc - 128) - 0.391*(uc - 128);
         //r = 1.164*(yc - 16) + 1.596*(vc - 128);
-        r = yc + 1.403*vc;
-        g = yc - 0.344*uc - 0.714 * vc;
-        b = yc + 1.770 * uc;
-        if (r > 255) r = 255;
-        if (g > 255) g = 255;
-        if (b > 255) b = 255;
-        if (r < 0) r = 0;
-        if (g < 0) g = 0;
-        if (b < 0) b = 0;
+        //r = yc + 1.403*vc;
+        //g = yc - 0.344*uc - 0.714 * vc;
+        //b = yc + 1.770 * uc;
+        //r = yc + 1.402 * (uc-128);
+        //g = yc - 0.34414 * (vc-128) - 0.71414 * (uc-128);
+        //b = yc + 1.772 * (vc-128);
+        C= yc - 16;
+        D= uc - 128;
+        E= vc - 128;
+
+        r = ( 298 * C           + 409 * E + 128) >> 8;
+        g = ( 298 * C - 100 * D - 208 * E + 128) >> 8;
+        b = ( 298 * C + 516 * D           + 128) >> 8;
+
+        r=clip(r);
+        g=clip(g);
+        b=clip(b);
 
         fprintf( out_fp,"%c%c%c",r,g,b);