I have a pdf document containing several images. I want to retrieve the names of these images.
I know that ExtractImages extracts images from PDF. I feel that this will somewhere have the functionality to fetch the name of the image.
How to achieve this using python
So I have these PDFs that are scanned copies of a structured feedback form. The form has these checkboxes and spaces for hand written notes. I am trying to extract the data from these PDFs and save it to an unstructured CSV file.
Now using pytesseract I am able to grab the printed text (by first converting the PDF to image) but I am not able to capture the handwritten content. Is there any of doing it.
I am enclosing a sample form for reference.
!https://imgur.com/a/2FYqWJf
PyTesseract is an OCR program. It has not been trained or designed to recognize handwriting. So you have two options: 1) Retrain it for handwriting (this would be quite time-consuming and complicated though) 2) Use another library actually meant for recognizing handwriting and not printed text like this one: https://learn.microsoft.com/en-us/azure/cognitive-services/computer-vision/quickstarts/python-hand-text
How to differentiate the scanned PDF and native PDF in Python?
Because both the documents having the extension with PDF only.
Is it possible to find whether the document is scanned PDF or native PDF by its properties?
I'mnot sure about the propeties, but if you zoom the page and curves still remain smooth - it's a Native PDF, if become uneven - it's scanned, because scanned PDF is no more than an image and don't have code that allows them to be edited.
I’m using the python library PyPDF2 to crop many PDF files to cut out the useless information on top and bottom of academic papers (i.e. page numbers and journal information at the bottom). Then I used the library textract to extract the texts from the cropped PDF files to txt files. However, the output txt files still contains the cropped out information despite the cropping.
This also applies to pdfminer, another text extraction library (not OCR). It seems that for text extraction, as opposed to OCR, the text cannot be eliminated by simply cropping. Can anyone explain why this is the case? Any idea on how else to eliminate useless information in PDF files for text extraction?
Hopefully this question wont be asking for too much and can be understandable, but any help would be amazing. Currently I am doing [astronomy] research, and I am required to construct a webpage of quasar spectra to look like this...Sample of final product
This is to be done so by downloading each individual spectra from this source here...https://data.sdss.org/sas/dr13/eboss/spectro/redux/images/v5_9_0/v5_9_0/3590-55201/.
The problem is, I am struggling to find a way to download large quantities of png files all at once. For some reason, all the spectra on this link do not have their coordinates (Right ascension and declination) on the file name. Whereas the code provided to me as an example does.
In the situation that I have the png "00:14:53.206-09:12:17.70-4536-55857-0770.png" downloaded, it should be displayed. However as mentioned before, all the files I have viewed when trying to do this myself, do not list those. My page looks like direct code, no actual images. But it remains in code because it cannot pull forward those spectra since they are not downloaded, and I would prefer to have them assorted by their coordinates.
Downloading a FITS file which contains the quasar catalog was suggested to me. Presumably, the coords would in some way have to be appended to the png files downloaded. Apparently this is all supposed to be easy.
In summary: How do I download large quantities of png files, where they do not display their coordinates. I also need a method of renaming the image files to so that their file names correspond with the coordinates, and then print to a webpage.
When displaying images on a website (regardless of where you sourced the images from, or the format - jpg/png etc), it is advisable that you COMPRESS your images. This is especially valid in cases where the images are big, and where there are a number of images on the page (pages like yours!). There are a few online image compressors like tinypng (where you can upload ~30 images at at time to compress, and it compresses both jpg and pngs) or pngcrush.
Compressing images this way will reduce the file size (greatly in some cases) but the image appears the same. This will very much improve the load time on your site.
When you download a file (any file, not just an image file, you can save it as anything you want (name-wise) so you can rename the files on download. You will need to upload all the [preferably compressed] images to a web server in order to display them on a webpage. If you don't know ANY webscripting, start with learning basic html (you won't need a lot for this project), but the best way to display the images would probably be to use a loop to loop through the image folder using either javascript or php