fix(cv): resolve infinite page duplication bug caused by playback cursor

scripts/debug/test_full_ocr.py

@@ -0,0 +1,32 @@
+import cv2
+import easyocr
+import numpy as np
+
+img_path = r"C:\Users\Certes\.gemini\antigravity\brain\5805a1e3-c776-4325-8538-351d54b5e0a0\ai_slice_3.png"
+img = cv2.imread(img_path)
+gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+_, bin_inv = cv2.threshold(gray, 200, 255, cv2.THRESH_BINARY_INV)
+
+row_sums = np.sum(bin_inv, axis=1) / 255.0
+staff_rows = np.where(row_sums > bin_inv.shape[1] * 0.4)[0]
+staff_top = staff_rows[0]
+
+upper_band = gray[max(0, staff_top - 60) : staff_top + 10, :] # Include slightly below top line
+cv2.imwrite(r"C:\Users\Certes\Desktop\guitar_score\scripts\debug\upper_band.png", upper_band)
+
+reader = easyocr.Reader(['en'], gpu=False)
+
+# Test 1: Original
+print("Testing Original Upper Band...")
+results = reader.readtext(upper_band, allowlist='0123456789')
+for r in results: print(r)
+
+# Test 2: Upscaled
+print("\nTesting Upscaled x2...")
+lg2 = cv2.resize(upper_band, (upper_band.shape[1]*2, upper_band.shape[0]*2), interpolation=cv2.INTER_CUBIC)
+for r in reader.readtext(lg2, allowlist='0123456789'): print(r)
+
+# Test 3: Binarized
+print("\nTesting Binarized Upscaled...")
+_, bin_lg = cv2.threshold(lg2, 180, 255, cv2.THRESH_BINARY_INV)
+for r in reader.readtext(bin_lg, allowlist='0123456789'): print(r)