Improve IK-style artifact scanner pipeline

2026-07-07 22:02:24 +02:00
parent 8ebbe91c39
commit f791d1464c
70 changed files with 7408 additions and 445 deletions
@@ -40,6 +40,18 @@ describe("ocrPreprocess", () => {
    expect(otsuThreshold(new Array<number>(256).fill(0))).toBe(127);
  });

+  it("can increase contrast before histogramming small numeric crops", () => {
+    const bitmap = bitmapFrom([
+      [118, 118, 118],
+      [138, 138, 138],
+    ], 2, 1);
+    const normal = computeLuminanceHistogram(bitmap);
+    const contrasted = computeLuminanceHistogram(bitmap, { contrast: 80 });
+    const normalValues = normal.flatMap((count, value) => Array.from({ length: count }, () => value));
+    const contrastedValues = contrasted.flatMap((count, value) => Array.from({ length: count }, () => value));
+    expect(Math.max(...contrastedValues) - Math.min(...contrastedValues)).toBeGreaterThan(Math.max(...normalValues) - Math.min(...normalValues));
+  });
+
  it("inverts bright foreground to black-on-white by default", () => {
    // Bright text pixel + dark background pixel.
    const bitmap = bitmapFrom([