Data commit

Task/Image-convolution/C/image-convolution-1.c

@@ -0,0 +1 @@
+image filter(image img, double *K, int Ks, double, double);

Task/Image-convolution/C/image-convolution-2.c

@@ -0,0 +1,39 @@
+#include "imglib.h"
+
+inline static color_component GET_PIXEL_CHECK(image img, int x, int y, int l) {
+  if ( (x<0) || (x >= img->width) || (y<0) || (y >= img->height) ) return 0;
+  return GET_PIXEL(img, x, y)[l];
+}
+
+image filter(image im, double *K, int Ks, double divisor, double offset)
+{
+  image oi;
+  unsigned int ix, iy, l;
+  int kx, ky;
+  double cp[3];
+
+  oi = alloc_img(im->width, im->height);
+  if ( oi != NULL ) {
+    for(ix=0; ix < im->width; ix++) {
+      for(iy=0; iy < im->height; iy++) {
+	cp[0] = cp[1] = cp[2] = 0.0;
+	for(kx=-Ks; kx <= Ks; kx++) {
+	  for(ky=-Ks; ky <= Ks; ky++) {
+	    for(l=0; l<3; l++)
+	      cp[l] += (K[(kx+Ks) +
+                        (ky+Ks)*(2*Ks+1)]/divisor) *
+                        ((double)GET_PIXEL_CHECK(im, ix+kx, iy+ky, l)) + offset;
+	  }
+	}
+	for(l=0; l<3; l++)
+	  cp[l] = (cp[l]>255.0) ? 255.0 : ((cp[l]<0.0) ? 0.0 : cp[l]) ;
+	put_pixel_unsafe(oi, ix, iy,
+			 (color_component)cp[0],
+			 (color_component)cp[1],
+			 (color_component)cp[2]);
+      }
+    }
+    return oi;
+  }
+  return NULL;
+}

Task/Image-convolution/C/image-convolution-3.c

@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include "imglib.h"
+
+const char *input = "Lenna100.jpg";
+const char *output = "filtered_lenna%d.ppm";
+
+double emboss_kernel[3*3] = {
+  -2., -1.,  0.,
+  -1.,  1.,  1.,
+  0.,  1.,  2.,
+};
+
+double sharpen_kernel[3*3] = {
+  -1.0, -1.0, -1.0,
+  -1.0,  9.0, -1.0,
+  -1.0, -1.0, -1.0
+};
+double sobel_emboss_kernel[3*3] = {
+  -1., -2., -1.,
+  0.,  0.,  0.,
+  1.,  2.,  1.,
+};
+double box_blur_kernel[3*3] = {
+  1.0, 1.0, 1.0,
+  1.0, 1.0, 1.0,
+  1.0, 1.0, 1.0,
+};
+
+double *filters[4] = {
+  emboss_kernel, sharpen_kernel, sobel_emboss_kernel, box_blur_kernel
+};
+const double filter_params[2*4] = {
+  1.0, 0.0,
+  1.0, 0.0,
+  1.0, 0.5,
+  9.0, 0.0
+};
+
+int main()
+{
+  image ii, oi;
+  int i;
+  char lennanames[30];
+
+  ii = read_image(input);
+  if ( ii != NULL ) {
+    for(i=0; i<4; i++) {
+      sprintf(lennanames, output, i);
+      oi = filter(ii, filters[i], 1, filter_params[2*i], filter_params[2*i+1]);
+      if ( oi != NULL ) {
+	FILE *outfh = fopen(lennanames, "w");
+	if ( outfh != NULL ) {
+	  output_ppm(outfh, oi);
+	  fclose(outfh);
+	} else { fprintf(stderr, "out err %s\n", output); }
+	free_img(oi);
+      } else { fprintf(stderr, "err creating img filters %d\n", i); }
+    }
+    free_img(ii);
+  } else { fprintf(stderr, "err reading %s\n", input); }
+}