| """
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| Relabel all label files belonging to images whose filename starts with
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| "AluCan" so every bounding box in those files uses the correct class ID
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| (drink_can), regardless of what class ID they currently have.
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|
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| Use case: filenames like AluCan67.jpg were found to have been mislabeled
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| as plastic_bottle in their .txt files. Since the filename itself reliably
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| tells you the true class, this script fixes all of them in one pass.
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|
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| IMPORTANT:
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| - This assumes EVERY box in an AluCan*.txt file should be drink_can.
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| If any AluCan* image legitimately also contains a bottle or paper
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| in the same frame, this script will wrongly relabel those boxes too.
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| Spot-check a few multi-object AluCan images before trusting this blindly.
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| - Run this on train, val, and test label folders separately (or all at once
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| by listing multiple label dirs below).
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| - Always back up your labels folder before running, or run with DRY_RUN=True
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| first to preview changes without writing anything.
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| """
|
|
|
| import os
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| import shutil
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|
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|
|
|
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| LABEL_DIRS = [
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|
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| r"C:\Users\shrey\Downloads\dataset\labels\train"
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|
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| ]
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|
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| FILENAME_PREFIX = "hardneg_can_PET"
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| CORRECT_CLASS_ID = "0"
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|
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| DRY_RUN = False
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| BACKUP_SUFFIX = ".bak"
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|
|
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|
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| def relabel_file(path, correct_id, dry_run):
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| with open(path) as f:
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| lines = [line.strip() for line in f if line.strip()]
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|
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| changed_lines = []
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| changed_count = 0
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|
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| for line in lines:
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| parts = line.split()
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| if not parts:
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| continue
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| old_id = parts[0]
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| if old_id != correct_id:
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| changed_count += 1
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| parts[0] = correct_id
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| changed_lines.append(" ".join(parts))
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|
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| if changed_count == 0:
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| return 0
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|
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| if dry_run:
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| print(f"[DRY RUN] Would fix {changed_count} line(s) in: {path}")
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| else:
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|
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| shutil.copy(path, path + BACKUP_SUFFIX)
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| with open(path, "w") as f:
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| f.write("\n".join(changed_lines) + "\n")
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| print(f"Fixed {changed_count} line(s) in: {path}")
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|
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| return changed_count
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|
|
|
|
| def main():
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| total_files_touched = 0
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| total_lines_changed = 0
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|
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| for label_dir in LABEL_DIRS:
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| if not os.path.isdir(label_dir):
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| print(f"Skipping (not found): {label_dir}")
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| continue
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|
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| for fname in os.listdir(label_dir):
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| if fname.endswith(".txt") and fname.startswith(FILENAME_PREFIX):
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| path = os.path.join(label_dir, fname)
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| changed = relabel_file(path, CORRECT_CLASS_ID, DRY_RUN)
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| if changed:
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| total_files_touched += 1
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| total_lines_changed += changed
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|
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| mode = "DRY RUN -- no files were modified" if DRY_RUN else "LIVE -- files were modified (backups saved as .bak)"
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| print(f"\nDone ({mode}).")
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| print(f"Files touched: {total_files_touched}")
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| print(f"Total lines relabeled: {total_lines_changed}")
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|
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| if DRY_RUN:
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| print("\nReview the output above. If it looks correct, set DRY_RUN = False and rerun.")
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|
|
|
|
| if __name__ == "__main__":
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| main() |
