AalbatrossGuy

Signature Extraction From PDFs

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The core principle behind extracting a signature from a PDF involves identifying and isolating the signature's visual representation, whether it's a digitally embedded signature or a scanned image of a handwritten signature.

Digital signatures

They are embedded within the PDF structure as data objects, often associated with a signature handler that uses Public/Private Key cryptography. These data objects include information about what parts of the document were signed, the signer’s identity, and a cryptographic hash. The extraction involves locating these fields, reading their content, and interpreting the digital certificate and signature metadata. Digital signatures are generally interactive with form field of type /Sig th

AalbatrossGuy

from dotenv import load_dotenv
from moviepy import VideoFileClip
import cv2

def create_thumbnail(file) -> None:
    video = VideoFileClip(f"{os.getenv('path/to/video.mp4')}") # Get the video from storage.
    filenoext = file.rsplit('.', 1)[0] # Get the filename without the extension ['mp4', 'mov', 'mkv', etc.]
    get_frame = video.get_frame(3) # Get the 3rd frame from the video. You can choose the frame you need. Getting a single frame from the video helps in memory efficiency as the video doesn't need to be loaded in memory completely. 
    cv2.imwrite(f"{os.getenv('path/to/save/image.jpg')}", get_frame) # Save the frame to the desired path.
    # Don't load the whole video in memory unless it's a lightweight video. 

AalbatrossGuy

@app.route("/upload", methods=["GET", "POST"])
def upload():
    if request.method =="POST":
        for file in request.files: # Get the file using flask.request from your <input> tag 
            if file.startswith('file'):
                get_file = request.files.get(file) # When uploading multiple files, use the loop
                with open(f"{os.getenv('ROOT_DIRECTORY')}/{get_file.filename}", 'wb') as file_binary: # wb will create the file if it doesn't exist and write the chunk
                    for file_chunk in get_file.stream: # Get the file in a stream reader
                        file_binary.write(file_chunk)
    return render_template("upload.html")