Esa Kataja
bad7612027
- Remove all temporary PNG files after PDF creation - Remove temporary directory - Update command feedback messages
146 lines
5.1 KiB
Python
Executable File
146 lines
5.1 KiB
Python
Executable File
import os
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#!/usr/bin/env -S uv run
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import click
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import cv2
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import numpy as np
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from PIL import Image
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from pdf2image import convert_from_path
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import img2pdf
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def ensure_temp_dir():
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"""Ensure temporary directory exists and return its path."""
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temp_dir = "temp_processed_images"
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os.makedirs(temp_dir, exist_ok=True)
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return temp_dir
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def get_temp_files():
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"""Get list of temporary PNG files in order."""
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temp_dir = ensure_temp_dir()
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files = [f for f in os.listdir(temp_dir) if f.endswith('.png')]
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files.sort() # Ensure correct page order
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return [os.path.join(temp_dir, f) for f in files]
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@click.group()
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def cli():
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"""PDF cleaning toolbox for musical scores."""
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pass
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@cli.command()
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@click.argument('input_pdf', type=click.Path(exists=True))
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def extract(input_pdf):
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"""Extract pages from PDF to temporary directory."""
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temp_dir = ensure_temp_dir()
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# Convert PDF to images
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print(f"Extracting pages from {input_pdf}...")
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pages = convert_from_path(input_pdf, dpi=400)
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# Save each page
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for i, page in enumerate(pages):
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output_path = os.path.join(temp_dir, f"page_{i:03d}.png")
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page.save(output_path, "PNG", optimize=False)
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print(f"Saved page {i+1}/{len(pages)}")
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print(f"Extracted {len(pages)} pages to {temp_dir}/")
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@cli.command()
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def deskew():
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"""Deskew all pages in temporary directory."""
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temp_files = get_temp_files()
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if not temp_files:
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print("No pages found in temporary directory. Run 'extract' first.")
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return
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for file_path in temp_files:
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print(f"Deskewing {os.path.basename(file_path)}...")
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# Read image
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image = cv2.imread(file_path)
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# Convert to grayscale
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gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
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# Apply threshold to get binary image
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_, binary = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)
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# Create a rectangular kernel that's wider than it is tall
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# This helps detect horizontal lines
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kernel_length = np.array(binary).shape[1]//80
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horizontal_kernel = cv2.getStructuringElement(cv2.MORPH_RECT, (kernel_length, 1))
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# Detect horizontal lines
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horizontal_lines = cv2.erode(binary, horizontal_kernel, iterations=3)
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horizontal_lines = cv2.dilate(horizontal_lines, horizontal_kernel, iterations=3)
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# Use probabilistic Hough transform to detect line segments
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line_segments = cv2.HoughLinesP(
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cv2.bitwise_not(horizontal_lines),
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rho=1,
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theta=np.pi/180,
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threshold=100,
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minLineLength=binary.shape[1]//4, # Lines must be at least 1/4 of image width
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maxLineGap=20
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)
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if line_segments is not None and len(line_segments) > 0:
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# Calculate angles of detected line segments
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angles = []
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for line in line_segments:
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x1, y1, x2, y2 = line[0]
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if x2 - x1 == 0: # Avoid division by zero
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continue
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angle = np.degrees(np.arctan2(y2 - y1, x2 - x1))
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# Only consider angles that are close to horizontal
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if abs(angle) < 20:
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angles.append(angle)
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if angles:
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# Use median angle to avoid outliers
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median_angle = np.median(angles)
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# Only rotate if the angle is significant but not too large
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if 0.5 < abs(median_angle) < 20:
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height, width = image.shape[:2]
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center = (width/2, height/2)
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rotation_matrix = cv2.getRotationMatrix2D(center, median_angle, 1.0)
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rotated = cv2.warpAffine(image, rotation_matrix, (width, height),
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flags=cv2.INTER_CUBIC,
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borderMode=cv2.BORDER_REPLICATE)
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# Save rotated image
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cv2.imwrite(file_path, rotated)
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print(f" Rotated by {median_angle:.2f} degrees")
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else:
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print(" No significant rotation needed")
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else:
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print(" No valid horizontal lines found")
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else:
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print(" No line segments detected")
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@cli.command()
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@click.argument('output_pdf', type=click.Path())
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def finalize(output_pdf):
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"""Combine processed pages into final PDF and clean up."""
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temp_dir = ensure_temp_dir()
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temp_files = get_temp_files()
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if not temp_files:
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print("No pages found in temporary directory. Run 'extract' first.")
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return
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print(f"Combining {len(temp_files)} pages into {output_pdf}...")
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# Convert to PDF
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with open(output_pdf, "wb") as f:
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f.write(img2pdf.convert(temp_files))
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# Clean up temporary files
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print("Cleaning up temporary files...")
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for file_path in temp_files:
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os.remove(file_path)
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os.rmdir(temp_dir)
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print("PDF created successfully and temporary files removed!")
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if __name__ == '__main__':
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cli()
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