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authorSanto Cariotti <santo@dcariotti.me>2021-02-16 21:51:54 +0100
committerSanto Cariotti <santo@dcariotti.me>2021-02-16 21:51:54 +0100
commit321b268bb74512289f9eb361560e8ceb9d30fe59 (patch)
treeb5ddb9ab187a952891fc2f988fb47088fc03a5f9 /Year_2/IandM
parent67438312a69f7b7aa1fdbc27610438897791ceef (diff)
i&m: add operations
Diffstat (limited to 'Year_2/IandM')
-rw-r--r--Year_2/IandM/equalization/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/equalization/equalization.pde49
-rw-r--r--Year_2/IandM/gamma/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/gamma/gamma.pde26
-rw-r--r--Year_2/IandM/histogram/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/histogram/histogram.pde33
-rw-r--r--Year_2/IandM/logarithm/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/logarithm/logarithm.pde26
-rw-r--r--Year_2/IandM/negative/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/negative/negative.pde25
-rw-r--r--Year_2/IandM/psnr_mse/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/psnr_mse/psnr_mse.pde50
-rw-r--r--Year_2/IandM/psnr_mse/psnr_mse8365406430453607560.autosave25
-rw-r--r--Year_2/IandM/quantization/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/quantization/quantization.pde25
-rw-r--r--Year_2/IandM/replication2x/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/replication2x/replication2x.pde22
-rw-r--r--Year_2/IandM/stretching/data/lena.pngbin0 -> 473831 bytes
-rw-r--r--Year_2/IandM/stretching/stretching.pde32
19 files changed, 313 insertions, 0 deletions
diff --git a/Year_2/IandM/equalization/data/lena.png b/Year_2/IandM/equalization/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/equalization/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/equalization/equalization.pde b/Year_2/IandM/equalization/equalization.pde
new file mode 100644
index 0000000..fa7b1e2
--- /dev/null
+++ b/Year_2/IandM/equalization/equalization.pde
@@ -0,0 +1,49 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(equalization(img), 256, 0);
+}
+
+PImage equalization(PImage I) {
+ PImage out = I.copy();
+ float[] h = histogram(out);
+
+ for (int i = 1; i < 256; ++i) {
+ h[i] = h[i]+h[i-1];
+ }
+
+ out.loadPixels();
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ out.pixels[i] = color(255*h[int(red(out.pixels[i]))]);
+ }
+
+ out.updatePixels();
+
+ return out;
+}
+
+float[] histogram(PImage I) {
+ float[] h = new float[256];
+ for (int i = 0; i< 256; ++i) {
+ h[i] = 0;
+ }
+
+ I.loadPixels();
+
+ for (int i = 0; i < I.pixels.length; ++i) {
+ h[int(red(I.pixels[i]))]++;
+ }
+
+ for (int i = 0; i < 256; ++i) {
+ h[i] = h[i] / I.pixels.length;
+ }
+
+ I.updatePixels();
+
+ return h;
+}
diff --git a/Year_2/IandM/gamma/data/lena.png b/Year_2/IandM/gamma/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/gamma/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/gamma/gamma.pde b/Year_2/IandM/gamma/gamma.pde
new file mode 100644
index 0000000..8317e75
--- /dev/null
+++ b/Year_2/IandM/gamma/gamma.pde
@@ -0,0 +1,26 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+
+ image(img, 0, 0);
+ image(gamma(img, 2), 256, 0);
+}
+
+PImage gamma(PImage I, float gm) {
+ PImage out = I.copy();
+ out.loadPixels();
+ float r, g, b;
+ float C = 1 / pow(255, gm-1);
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r= C*pow(red(out.pixels[i]), gm);
+ g= C*pow(green(out.pixels[i]), gm);
+ b= C*pow(blue(out.pixels[i]), gm);
+
+ out.pixels[i] = color(r, g, b);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/histogram/data/lena.png b/Year_2/IandM/histogram/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/histogram/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/histogram/histogram.pde b/Year_2/IandM/histogram/histogram.pde
new file mode 100644
index 0000000..58f365a
--- /dev/null
+++ b/Year_2/IandM/histogram/histogram.pde
@@ -0,0 +1,33 @@
+void setup() {
+ size(256, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ float[] hist = histogram(img);
+ for(int i = 0; i < 256; ++i) {
+ println(i, hist[i]);
+ }
+}
+
+float[] histogram(PImage I) {
+ float[] h = new float[256];
+ for (int i = 0; i< 256; ++i) {
+ h[i] = 0;
+ }
+
+ I.loadPixels();
+
+ for(int i = 0; i < I.pixels.length; ++i) {
+ h[int(red(I.pixels[i]))]++;
+ }
+
+ for(int i = 0; i < 256; ++i) {
+ h[i] = h[i] / I.pixels.length;
+ }
+
+ I.updatePixels();
+
+ return h;
+}
diff --git a/Year_2/IandM/logarithm/data/lena.png b/Year_2/IandM/logarithm/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/logarithm/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/logarithm/logarithm.pde b/Year_2/IandM/logarithm/logarithm.pde
new file mode 100644
index 0000000..5fe02e7
--- /dev/null
+++ b/Year_2/IandM/logarithm/logarithm.pde
@@ -0,0 +1,26 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+
+ image(img, 0, 0);
+ image(logarithm(img, 100), 256, 0);
+}
+
+PImage logarithm(PImage I, int k) {
+ PImage out = I.copy();
+ out.loadPixels();
+ float r, g, b;
+ float C = k/log(256);
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r= C*log(1+red(out.pixels[i]));
+ g= C*log(1+green(out.pixels[i]));
+ b= C*log(1+blue(out.pixels[i]));
+
+ out.pixels[i] = color(r, g, b);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/negative/data/lena.png b/Year_2/IandM/negative/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/negative/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/negative/negative.pde b/Year_2/IandM/negative/negative.pde
new file mode 100644
index 0000000..c7c4475
--- /dev/null
+++ b/Year_2/IandM/negative/negative.pde
@@ -0,0 +1,25 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+
+ image(img, 0, 0);
+ image(negative(img), 256, 0);
+}
+
+PImage negative(PImage I) {
+ PImage out = I.copy();
+ out.loadPixels();
+ float r, g, b;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r= 255-red(out.pixels[i]);
+ g= 255-green(out.pixels[i]);
+ b= 255-blue(out.pixels[i]);
+
+ out.pixels[i] = color(r, g, b);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/psnr_mse/data/lena.png b/Year_2/IandM/psnr_mse/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/psnr_mse/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/psnr_mse/psnr_mse.pde b/Year_2/IandM/psnr_mse/psnr_mse.pde
new file mode 100644
index 0000000..9aa0a8b
--- /dev/null
+++ b/Year_2/IandM/psnr_mse/psnr_mse.pde
@@ -0,0 +1,50 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+ PImage img2 = negative(img);
+ image(img, 0, 0);
+ image(img2, 256, 0);
+
+ print("PSNR: ", psnr(img, img2));
+}
+
+float mse(PImage i1, PImage i2) {
+ float res = 0;
+ i1.loadPixels();
+ i2.loadPixels();
+
+ for (int i = 0; i < i1.pixels.length; ++i) {
+ res+= pow(red(i1.pixels[i])-red(i2.pixels[i]), 2);
+ }
+ res = res/i1.pixels.length;
+ i1.updatePixels();
+ i2.updatePixels();
+
+ return res;
+}
+
+float psnr(PImage i1, PImage i2) {
+ float mse = mse(i1, i2);
+ float res = 10*log(255*255/mse)/log(10);
+
+ return res;
+}
+
+PImage negative(PImage I) {
+ PImage out = I.copy();
+ out.loadPixels();
+ float r, g, b;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r= 255-red(out.pixels[i]);
+ g= 255-green(out.pixels[i]);
+ b= 255-blue(out.pixels[i]);
+
+ out.pixels[i] = color(r, g, b);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/psnr_mse/psnr_mse8365406430453607560.autosave b/Year_2/IandM/psnr_mse/psnr_mse8365406430453607560.autosave
new file mode 100644
index 0000000..cac2b99
--- /dev/null
+++ b/Year_2/IandM/psnr_mse/psnr_mse8365406430453607560.autosave
@@ -0,0 +1,25 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(quantization(img, 10), 256, 0);
+}
+
+PImage quantization(PImage I, int k) {
+ PImage out = I.copy();
+ out.loadPixels();
+ int r;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r = (int) floor((red(out.pixels[i])*k)/256);
+ r = int((float(r)/(k-1))*255);
+
+ out.pixels[i] = color(r);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/quantization/data/lena.png b/Year_2/IandM/quantization/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/quantization/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/quantization/quantization.pde b/Year_2/IandM/quantization/quantization.pde
new file mode 100644
index 0000000..cac2b99
--- /dev/null
+++ b/Year_2/IandM/quantization/quantization.pde
@@ -0,0 +1,25 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(quantization(img, 10), 256, 0);
+}
+
+PImage quantization(PImage I, int k) {
+ PImage out = I.copy();
+ out.loadPixels();
+ int r;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ r = (int) floor((red(out.pixels[i])*k)/256);
+ r = int((float(r)/(k-1))*255);
+
+ out.pixels[i] = color(r);
+ }
+
+ out.updatePixels();
+ return out;
+}
diff --git a/Year_2/IandM/replication2x/data/lena.png b/Year_2/IandM/replication2x/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/replication2x/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/replication2x/replication2x.pde b/Year_2/IandM/replication2x/replication2x.pde
new file mode 100644
index 0000000..dc1d162
--- /dev/null
+++ b/Year_2/IandM/replication2x/replication2x.pde
@@ -0,0 +1,22 @@
+void setup() {
+ size(768, 512);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ image(img, 0, 0);
+ image(replication2x(img), 256, 0);
+}
+
+PImage replication2x(PImage I) {
+ PImage out = createImage(I.width*2, I.height*2, RGB);
+
+ for(int x = 0; x < I.width; ++x) {
+ for(int y = 0; y < I.height; ++y) {
+ out.set(2*x, 2*y, I.get(x, y));
+ out.set(2*x+1, 2*y, I.get(x, y));
+ out.set(2*x, 2*y+1, I.get(x, y));
+ out.set(2*x+1, 2*y+1, I.get(x, y));
+ }
+ }
+
+ return out;
+}
diff --git a/Year_2/IandM/stretching/data/lena.png b/Year_2/IandM/stretching/data/lena.png
new file mode 100644
index 0000000..59ef68a
--- /dev/null
+++ b/Year_2/IandM/stretching/data/lena.png
Binary files differ
diff --git a/Year_2/IandM/stretching/stretching.pde b/Year_2/IandM/stretching/stretching.pde
new file mode 100644
index 0000000..0814190
--- /dev/null
+++ b/Year_2/IandM/stretching/stretching.pde
@@ -0,0 +1,32 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(stretching(img), 256, 0);
+}
+
+PImage stretching(PImage I) {
+ PImage out = I.copy();
+ out.loadPixels();
+
+ float max = red(out.pixels[0]);
+ float min = max;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ float t = red(out.pixels[i]);
+ if (t < min)
+ min = t;
+ if (t > max)
+ max = t;
+ }
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ out.pixels[i]= color(255*(red(out.pixels[i])-min)/(max-min));
+ }
+
+ out.updatePixels();
+ return out;
+}