diff options
| -rw-r--r-- | histogrammer/.gitignore | 1 | ||||
| -rw-r--r-- | histogrammer/Cargo.lock | 1058 | ||||
| -rw-r--r-- | histogrammer/Cargo.toml | 12 | ||||
| -rw-r--r-- | histogrammer/src/main.rs | 83 |
4 files changed, 1154 insertions, 0 deletions
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<me@iximeow.net>"] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +image = "*" +plotters = "*" +show-image = "*" diff --git a/histogrammer/src/main.rs b/histogrammer/src/main.rs new file mode 100644 index 0000000..9025787 --- /dev/null +++ b/histogrammer/src/main.rs @@ -0,0 +1,83 @@ +use image; + +use plotters::prelude::*; + +fn main() { + let im = image::open("/misc/camera_recorder/ngc6888_o3_20201002_set2_1.png").expect("can load image"); + let im = match im { + image::DynamicImage::ImageLuma16(ref p) => Some(p), + _ => None, + }; + if let Some(img) = im { + let (w, h) = img.dimensions(); + println!("got 16-bit greyscale image: {}x{}", w, h); + let total = w * h; +// let mut histogram = [0u32; 65536]; +// for px in img.enumerate_pixels() { +// histogram[px.2[0] as usize] += 1; +// } + + let hi = img.enumerate_pixels().map(|x| ((x.2[0]) as f64, if x.2[0] == 0 { 0f64 } else { 1f64 / (total as f64) })); + + // println!("hist: {:?}", &histogram[..]); + + fn draw_hist<I: IntoIterator<Item=(f64, f64)>>(hist_data: I, start: usize, end: usize) -> Vec<u8> { + assert!(start <= end); + + let mut data = vec![0; 640 * 480 * 3]; + + { + let mut root = BitMapBackend::with_buffer(&mut data, (640, 480)).into_drawing_area(); + root.fill(&WHITE); + + let mut chart = ChartBuilder::on(&root) + .margin(5) + .caption("Pixel histogram", ("sans-serif", 30)) + .set_label_area_size(LabelAreaPosition::Left, 60) + .set_label_area_size(LabelAreaPosition::Bottom, 60) + .set_label_area_size(LabelAreaPosition::Right, 60) + .build_cartesian_2d((start as f64)..(end as f64), 0f64..2.0).unwrap() + .set_secondary_coord( + ((start as f64)..(end as f64)).step(1.0).use_round().into_segmented(), + 0f64..0.05f64, + ); + + chart + .configure_mesh() + .disable_x_mesh() + .disable_y_mesh() + .y_desc("Percentage") + .draw().unwrap(); + + chart.configure_secondary_axes().y_desc("Count").draw().unwrap(); + + let actual = Histogram::vertical(chart.borrow_secondary()) + .style(GREEN.filled()) + .margin(3) + .data(hist_data); + + chart + .draw_secondary_series(actual).unwrap() + .label("Observed") + .legend(|(x, y)| Rectangle::new([(x, y - 5), (x + 10, y + 5)], GREEN.filled())); + + chart.configure_series_labels().draw().unwrap(); + } + + data + } + +// let data = draw_hist(&histogram[..], 0, 6000); + let data = draw_hist(hi, 0, 6000); + + use show_image::make_window; + let window = make_window("image").expect("can make the window"); + let image_info = show_image::ImageInfo::rgb8(640, 480); + window.set_image(&(data, image_info), "histogram"); + loop { + std::thread::sleep(std::time::Duration::from_millis(10000)); + } + } else { + panic!("image was not 16-bit greyscale"); + } +} |