Adds mutators and experiment setup

Calculates basic phashes for images and their mutations.
More stats are needed, but it's a start

src/descriptors/mod.rs

@@ -1,6 +1,8 @@
 //! Descriptors that can be used to describe an image.
 //! If two images are (almost) the same, their descriptions will be the same.
 
+use image::GenericImageView;
+
 pub trait Descriptor {
     /// Print the name of the descriptor, 
     fn info(&self) -> String;
@@ -36,34 +38,44 @@ pub struct DCT {
 }
 pub mod dct;
 
-// fn median64<T: Ord + Copy>(values: &[T]) -> T {
-//     let mut sorted_values = values.to_vec();
-//     sorted_values.sort();
-//     let len = sorted_values.len();
-//     sorted_values[len/2]
-// }
+fn median64<T: Ord + Copy>(values: &[T]) -> T {
+    let mut sorted_values = values.to_vec();
+    sorted_values.sort();
+    let len = sorted_values.len();
+    sorted_values[len/2]
+}
 
+pub struct Median;
 
-// pub struct Median;
+impl Descriptor for Median {
+    fn info(&self) -> String {
+        "median".to_string()
+    }
 
-// impl Descriptor for Median {
-//     fn describe(&self, img: image::DynamicImage) -> u64 {
-//         let img = self.resize(img);
-//         let mut values: [u8; 64] = [0; 64];
-//         let mut i: usize = 0;
-//         for (_, _, pix) in img.pixels() {
-//             values[i] = pix[0];
-//             i = i+1;
-//         }
-//         let median = median64(&values);
-//         let mut mask: u64 = 0;
-//         img.save("debug.png").unwrap();
-//         for (_, _, pix) in img.pixels() {
-//             if pix[0] > median {
-//                 mask += 1;
-//             }
-//             mask = mask << 1;
-//         }
-//         mask
-//     }
-// }
+    fn describe(&self, img: &image::DynamicImage) -> u64 {
+        let img = self.resize(img);
+        let mut values: [u8; 64] = [0; 64];
+        let mut i: usize = 0;
+        for (_, _, pix) in img.pixels() {
+            values[i] = pix[0];
+            i = i+1;
+        }
+        let median = median64(&values);
+        let mut mask: u64 = 0;
+        img.save("debug.png").unwrap();
+        for (_, _, pix) in img.pixels() {
+            if pix[0] > median {
+                mask += 1;
+            }
+            mask = mask << 1;
+        }
+        mask
+    }
+}
+
+pub fn get_all_descriptors() -> Vec<Box<dyn Descriptor>> {
+	let mut descriptors: Vec<Box<dyn Descriptor>> = Vec::with_capacity(2);
+	descriptors.push(Box::new(DCT::new()));
+	descriptors.push(Box::new(Median));
+	descriptors
+}