Desktop: Resolves #11608: Increase the likelihood of text generation from image recognition

packages/lib/services/ocr/OcrService.test.ts

@@ -248,4 +248,28 @@ describe('OcrService', () => {
 	// 	await service.dispose();
 	// });
 
+	it('should generate text even on cases of lower confidence', async () => {
+		const { resource } = await createNoteAndResource({ path: `${ocrSampleDir}/low_confidence_testing.png` });
+
+		const service = newOcrService();
+		await service.processResources();
+
+		const processedResource: ResourceEntity = await Resource.load(resource.id);
+		expect(processedResource.ocr_text.includes('1.')).toBe(true);
+		// cSpell:disable
+		expect(processedResource.ocr_text.includes('eback Mountain (2005)')).toBe(true);
+		// cSpell:enable
+
+		expect(processedResource.ocr_text.includes('2.')).toBe(true);
+		expect(processedResource.ocr_text.includes('Havoc (2005)')).toBe(true);
+
+		expect(processedResource.ocr_text.includes('3.')).toBe(true);
+		expect(processedResource.ocr_text.includes('Love & Other Drugs (2010)')).toBe(true);
+
+		expect(processedResource.ocr_text.includes('4.')).toBe(true);
+		expect(processedResource.ocr_text.includes('The Last Thing He Wanted (2020)')).toBe(true);
+
+		await service.dispose();
+	});
+
 });

packages/lib/services/ocr/drivers/OcrDriverTesseract.ts

@@ -23,10 +23,15 @@ const formatTesseractBoundingBox = (boundingBox: Tesseract.Bbox): RecognizeResul
 	return [boundingBox.x0, boundingBox.x1, boundingBox.y0, boundingBox.y1];
 };
 
-// Empirically, it seems anything below 70 is not usable. Between 70 and 75 it's
-// hit and miss, but often it's good enough that we should keep the result.
-// Above this is usually reliable.
-const minConfidence = 70;
+// 2023-12-13: Empirically, it seems anything below 70 is not usable. Between 70
+// and 75 it's hit and miss, but often it's good enough that we should keep the result.
+// Above this is usually reliable. Using 70 for now.
+//
+// 2025-04-03: Changed to 55 to detect text in images that are supported in
+// other tools but were not in Joplin.
+//
+// https://github.com/laurent22/joplin/issues/11608
+const minConfidence = 55;
 
 interface Options {
 	workerPath: string;