From 1942f603803a92b0c2f078975a04167a6ee2f7bf Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Thu, 18 Feb 2021 19:18:32 +0100
Subject: i&m: add operators
---
Year_2/IandM/bitplane/bitplane.pde | 39 +++++++++++++++++
Year_2/IandM/bitplane/data/lena.png | Bin 0 -> 473831 bytes
Year_2/IandM/convolution/convolution.pde | 73 +++++++++++++++++++++++++++++++
Year_2/IandM/convolution/data/lena.png | Bin 0 -> 473831 bytes
Year_2/IandM/maximum/data/lena.png | Bin 0 -> 473831 bytes
Year_2/IandM/maximum/maximum.pde | 31 +++++++++++++
Year_2/IandM/median/data/lena.png | Bin 0 -> 473831 bytes
Year_2/IandM/median/median.pde | 37 ++++++++++++++++
Year_2/IandM/minimum/data/lena.png | Bin 0 -> 473831 bytes
Year_2/IandM/minimum/minimum.pde | 31 +++++++++++++
10 files changed, 211 insertions(+)
create mode 100644 Year_2/IandM/bitplane/bitplane.pde
create mode 100644 Year_2/IandM/bitplane/data/lena.png
create mode 100644 Year_2/IandM/convolution/convolution.pde
create mode 100644 Year_2/IandM/convolution/data/lena.png
create mode 100644 Year_2/IandM/maximum/data/lena.png
create mode 100644 Year_2/IandM/maximum/maximum.pde
create mode 100644 Year_2/IandM/median/data/lena.png
create mode 100644 Year_2/IandM/median/median.pde
create mode 100644 Year_2/IandM/minimum/data/lena.png
create mode 100644 Year_2/IandM/minimum/minimum.pde
(limited to 'Year_2/IandM')
diff --git a/Year_2/IandM/bitplane/bitplane.pde b/Year_2/IandM/bitplane/bitplane.pde
new file mode 100644
index 0000000..33cda9c
--- /dev/null
+++ b/Year_2/IandM/bitplane/bitplane.pde
@@ -0,0 +1,39 @@
+int nb = 0;
+
+void setup() {
+ size(512, 256);
+}
+
+void draw() {
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(bitplane(img, nb), 256, 0);
+}
+
+void keyPressed() {
+ if(key == '+' && nb < 7) {
+ nb++;
+ } else if(key == '-' && nb > 1) {
+ nb--;
+ }
+}
+
+PImage bitplane(PImage I, int nb) {
+ PImage out = I.copy();
+ out.loadPixels();
+
+ int x, r;
+
+ for (int i = 0; i < out.pixels.length; ++i) {
+ x = int(red(out.pixels[i]));
+ r = (x >> nb) & 1;
+ out.pixels[i] = color(255*r);
+ }
+
+ out.updatePixels();
+
+ return out;
+}
diff --git a/Year_2/IandM/bitplane/data/lena.png b/Year_2/IandM/bitplane/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/bitplane/data/lena.png differ
diff --git a/Year_2/IandM/convolution/convolution.pde b/Year_2/IandM/convolution/convolution.pde
new file mode 100644
index 0000000..cb2acf5
--- /dev/null
+++ b/Year_2/IandM/convolution/convolution.pde
@@ -0,0 +1,73 @@
+float n3 = 1/9.0;
+float[][] nbox3 = {{n3, n3, n3},
+ {n3, n3, n3},
+ {n3, n3, n3}};
+
+float n5 = 1.0/25;
+float[][] nbox5 = {{n5, n5, n5, n5, n5},
+ {n5, n5, n5, n5, n5},
+ {n5, n5, n5, n5, n5},
+ {n5, n5, n5, n5, n5},
+ {n5, n5, n5, n5, n5}};
+
+float[][] lapl = {{-1, 0, -1},
+ {0, 4, 0},
+ {-1, 0, -1}};
+
+float[][] sobx = {{-1, -2, -1},
+ {0, 0, 0},
+ {1, 2, 1}};
+
+float[][] sharp = {{-1, 0, -1},
+ {0, 5, 0},
+ {-1, 0, -1}};
+
+void setup() {
+ size(768, 512);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(convert(convolution(img, nbox3)), 256, 0);
+ image(convert(convolution(img, nbox5)), 512, 0);
+ image(convert(convolution(img, lapl)), 0, 256);
+ image(convert(convolution(img, sobx)), 256, 256);
+ image(convert(convolution(img, sharp)), 512, 256);
+}
+
+
+PImage convert(float[][] mat) {
+ PImage out = createImage(mat[0].length, mat.length, RGB);
+ float res = 0;
+
+ for (int x = 0; x < out.width; ++x) {
+ for (int y = 0; y < out.height; ++y) {
+ res = constrain(abs(mat[y][x]), 0, 255);
+ out.set(x, y, color(res));
+ }
+ }
+
+ return out;
+}
+
+float[][] convolution(PImage I, float[][] kernel) {
+ float[][] out = new float[I.height][I.width];
+ int n = kernel[0].length;
+ int m = kernel.length;
+ PImage tmp;
+
+ for (int x = 0; x < I.width; ++x) {
+ for (int y = 0; y < I.height; ++y) {
+ tmp = I.get(x-n/2, y-m/2, n, m);
+ float res = 0;
+ for (int p = 0; p < n; ++p)
+ for (int q = 0; q < m; ++q)
+ res+=red(tmp.get(p, q)) * kernel[q][p];
+
+ out[y][x] = res;
+ }
+ }
+
+ return out;
+}
diff --git a/Year_2/IandM/convolution/data/lena.png b/Year_2/IandM/convolution/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/convolution/data/lena.png differ
diff --git a/Year_2/IandM/maximum/data/lena.png b/Year_2/IandM/maximum/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/maximum/data/lena.png differ
diff --git a/Year_2/IandM/maximum/maximum.pde b/Year_2/IandM/maximum/maximum.pde
new file mode 100644
index 0000000..4f0f54f
--- /dev/null
+++ b/Year_2/IandM/maximum/maximum.pde
@@ -0,0 +1,31 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(maximum(img, 11), 256, 0);
+}
+
+PImage maximum(PImage I, int n) {
+ PImage out = createImage(I.width, I.height, RGB);
+
+ int off = n/2;
+
+ for (int x = 0; x < I.width; ++x) {
+ for (int y = 0; y < I.height; ++y) {
+ PImage t = I.get(x-off, y-off, n, n);
+ float[] tarr = new float[n*n];
+ t.loadPixels();
+
+ for(int i = 0; i < t.pixels.length; ++i) {
+ tarr[i] = red(t.pixels[i]);
+ }
+
+ out.set(x, y, color(max(tarr)));
+ }
+ }
+
+ return out;
+}
diff --git a/Year_2/IandM/median/data/lena.png b/Year_2/IandM/median/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/median/data/lena.png differ
diff --git a/Year_2/IandM/median/median.pde b/Year_2/IandM/median/median.pde
new file mode 100644
index 0000000..856e50e
--- /dev/null
+++ b/Year_2/IandM/median/median.pde
@@ -0,0 +1,37 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(median(img, 11), 256, 0);
+}
+
+PImage median(PImage I, int n) {
+ PImage out = createImage(I.width, I.height, RGB);
+
+ int off = n/2;
+
+ for (int x = 0; x < I.width; ++x) {
+ for (int y = 0; y < I.height; ++y) {
+ PImage t = I.get(x-off, y-off, n, n);
+ float[] tarr = new float[n*n];
+ t.loadPixels();
+
+ for(int i = 0; i < t.pixels.length; ++i) {
+ tarr[i] = red(t.pixels[i]);
+ }
+
+ tarr = sort(tarr);
+ float med = tarr[(n*n)/2];
+ if((n*n)%2 == 0) {
+ med = (med+tarr[(n*n)/2-1])/2;
+ }
+
+ out.set(x, y, color(med));
+ }
+ }
+
+ return out;
+}
diff --git a/Year_2/IandM/minimum/data/lena.png b/Year_2/IandM/minimum/data/lena.png
new file mode 100644
index 0000000..59ef68a
Binary files /dev/null and b/Year_2/IandM/minimum/data/lena.png differ
diff --git a/Year_2/IandM/minimum/minimum.pde b/Year_2/IandM/minimum/minimum.pde
new file mode 100644
index 0000000..b960a24
--- /dev/null
+++ b/Year_2/IandM/minimum/minimum.pde
@@ -0,0 +1,31 @@
+void setup() {
+ size(512, 256);
+ PImage img = loadImage("lena.png");
+ img.resize(256, 256);
+ img.filter(GRAY);
+
+ image(img, 0, 0);
+ image(minimum(img, 11), 256, 0);
+}
+
+PImage minimum(PImage I, int n) {
+ PImage out = createImage(I.width, I.height, RGB);
+
+ int off = n/2;
+
+ for (int x = 0; x < I.width; ++x) {
+ for (int y = 0; y < I.height; ++y) {
+ PImage t = I.get(x-off, y-off, n, n);
+ float[] tarr = new float[n*n];
+ t.loadPixels();
+
+ for(int i = 0; i < t.pixels.length; ++i) {
+ tarr[i] = red(t.pixels[i]);
+ }
+
+ out.set(x, y, color(min(tarr)));
+ }
+ }
+
+ return out;
+}
--
cgit v1.2.3-18-g5258