From 54649352911d679c1a80ff027fcdc3ed496c4421 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Nicolas <6371790+pynicolas@users.noreply.github.com>
Date: Thu, 15 Jan 2026 09:55:42 +0100
Subject: [PATCH] Adjust values for ExportQuality

---
 .../org/fairscan/app/domain/ExportQuality.kt  |   4 +-
 .../evaluation/ExportQualityEvaluator.kt      | 220 ++++++++++++++++++
 2 files changed, 222 insertions(+), 2 deletions(-)
 create mode 100644 evaluation/src/main/java/org/fairscan/evaluation/ExportQualityEvaluator.kt

diff --git a/app/src/main/java/org/fairscan/app/domain/ExportQuality.kt b/app/src/main/java/org/fairscan/app/domain/ExportQuality.kt
index 8b0c534..050bc92 100644
--- a/app/src/main/java/org/fairscan/app/domain/ExportQuality.kt
+++ b/app/src/main/java/org/fairscan/app/domain/ExportQuality.kt
@@ -27,7 +27,7 @@ enum class ExportQuality(
         maxPixels = 2_000_000
     ),
     HIGH(
-        jpegQuality = 90,
-        maxPixels = 5_000_000
+        jpegQuality = 80,
+        maxPixels = 4_000_000
     )
 }
diff --git a/evaluation/src/main/java/org/fairscan/evaluation/ExportQualityEvaluator.kt b/evaluation/src/main/java/org/fairscan/evaluation/ExportQualityEvaluator.kt
new file mode 100644
index 0000000..10e6a41
--- /dev/null
+++ b/evaluation/src/main/java/org/fairscan/evaluation/ExportQualityEvaluator.kt
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2025 Pierre-Yves Nicolas
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.fairscan.evaluation
+
+import org.fairscan.imageprocessing.detectDocumentQuad
+import org.fairscan.imageprocessing.extractDocument
+import org.fairscan.imageprocessing.isColoredDocument
+import org.fairscan.imageprocessing.scaledTo
+import org.opencv.core.MatOfInt
+import org.opencv.imgcodecs.Imgcodecs
+import java.io.File
+
+fun main() {
+    nu.pattern.OpenCV.loadLocally()
+    ExportQualityEvaluator.runEvaluation()
+}
+
+object ExportQualityEvaluator {
+
+    fun runEvaluation() {
+        val root = File("evaluation")
+        val datasetDir = File(root, "dataset")
+        val imageDir = File(datasetDir, "images")
+        val outputDir = File("evaluation/reports/export_quality").apply { mkdirs() }
+
+        val imgFiles = imageDir.listFiles { f -> f.extension.lowercase() == "jpg" }
+            ?.toList() ?: listOf<File>()
+
+        val qualities = listOf(60, 75, 80)
+        val maxPixelsList = listOf(1_500_000, 2_000_000, 4_000_000)
+
+        for (imgFile in imgFiles) {
+            val imgName = imgFile.nameWithoutExtension
+            val maskFile = File(datasetDir, "masks/$imgName.png")
+            if (!maskFile.exists()) continue
+
+            val sourceMat = Imgcodecs.imread(imgFile.absolutePath)
+            if (sourceMat.empty()) continue
+
+            val maskMat = Imgcodecs.imread(maskFile.absolutePath, Imgcodecs.IMREAD_UNCHANGED)
+            if (maskMat.empty()) continue
+
+            println("Processing ${imgName}...")
+
+            val mask = MatMask(maskMat)
+
+            val quad = detectDocumentQuad(mask, isLiveAnalysis = false)
+                ?.scaledTo(mask.width, mask.height, sourceMat.width(), sourceMat.height())
+            if (quad == null) {
+                println("Failed to detect quad for $imgName")
+                continue
+            }
+
+            val isColored = isColoredDocument(sourceMat, mask, quad)
+
+            for (quality in qualities) {
+
+                for (maxPixels in maxPixelsList) {
+                    val outputMat =
+                        extractDocument(sourceMat, quad, 0, isColored, maxPixels.toLong())
+
+                    val outputFile = File(outputDir, "$imgName-$quality-$maxPixels.jpg")
+                    val params = MatOfInt(Imgcodecs.IMWRITE_JPEG_QUALITY, quality)
+                    if (!Imgcodecs.imwrite(outputFile.absolutePath, outputMat, params)) {
+                        throw RuntimeException("Could not write image to ${outputFile.absolutePath}")
+                    }
+
+                    params.release()
+                    outputMat.release()
+                }
+            }
+            sourceMat.release()
+            generateHtmlReport(outputDir, imgName, qualities, maxPixelsList, crop = CropParams())
+        }
+    }
+
+    data class CropParams(
+        val centerX: Double = 0.5,
+        val centerY: Double = 0.5,
+        val size: Double = 0.5
+    )
+
+    fun generateHtmlReport(
+        outputDir: File,
+        imgName: String,
+        qualities: List<Int>,
+        maxPixelsList: List<Int>,
+        crop: CropParams
+    ) {
+        val htmlFile = File(outputDir, "$imgName.html")
+
+        htmlFile.writeText(
+            """
+        <!DOCTYPE html>
+        <html lang="en">
+        <head>
+            <meta charset="UTF-8">
+            <title>$imgName – Export quality comparison</title>
+            <style>
+                body {
+                    font-family: sans-serif;
+                }
+                .controls {
+                    margin-bottom: 1em;
+                }
+                .grid {
+                    display: grid;
+                    grid-template-columns: repeat(${maxPixelsList.size}, 1fr);
+                    gap: 8px;
+                }
+                .cell {
+                    border: 1px solid #ccc;
+                    padding: 4px;
+                    font-size: 12px;
+                }
+                .crop {
+                    width: 600px;
+                    height: 300px;
+                    overflow: hidden;
+                    border: 1px solid #000;
+                }
+                .crop img {
+                    transform-origin: top left;
+                }
+            </style>
+        </head>
+        <body>
+
+        <h1>$imgName</h1>
+
+        <div class="controls">
+            Center X <input type="range" id="cx" min="0" max="1" step="0.01" value="${crop.centerX}">
+            Center Y <input type="range" id="cy" min="0" max="1" step="0.01" value="${crop.centerY}">
+            Size <input type="range" id="size" min="0.05" max="0.5" step="0.01" value="${crop.size}">
+        </div>
+
+        ${qualities.joinToString("") { q ->
+                """
+            <div class="grid">
+                ${
+                    maxPixelsList.joinToString("") { mp ->
+                        val fileName = "$imgName-$q-$mp.jpg"
+                        """
+                        <div class="cell">
+                            <div>q$q - $mp px - ${File(outputDir, fileName).length() / 1024}kB</div>
+                            <div class="crop">
+                                <img src="$fileName" data-img>
+                            </div>
+                        </div>
+                        """
+                    }
+                }
+            </div>
+            """
+            }}
+
+        <script>
+            const imgs = document.querySelectorAll('[data-img]');
+            const cxInput = document.getElementById('cx');
+            const cyInput = document.getElementById('cy');
+            const sizeInput = document.getElementById('size');
+
+            function update() {
+                const cx = parseFloat(cxInput.value);
+                const cy = parseFloat(cyInput.value);
+                const size = parseFloat(sizeInput.value);
+            
+                imgs.forEach(img => {
+                    const crop = img.parentElement;
+                    const cropSize = crop.clientWidth;
+            
+                    const iw = img.naturalWidth;
+                    const ih = img.naturalHeight;
+            
+                    const minDim = Math.min(iw, ih);
+            
+                    const cropPixels = size * minDim;
+            
+                    const scale = cropSize / cropPixels;
+            
+                    const centerX = cx * iw;
+                    const centerY = cy * ih;
+            
+                    const x0 = centerX - cropPixels / 2;
+                    const y0 = centerY - cropPixels / 2;
+            
+                    img.style.transform =
+                        `translate(${'$'}{-x0 * scale}px, ${'$'}{-y0 * scale}px) scale(${'$'}{scale})`;
+                });
+            }
+
+            imgs.forEach(img => {
+                if (img.complete) update();
+                else img.onload = update;
+            });
+
+            cxInput.oninput = update;
+            cyInput.oninput = update;
+            sizeInput.oninput = update;
+        </script>
+
+        </body>
+        </html>
+        """.trimIndent()
+        )
+    }
+
+}
\ No newline at end of file