Creating Bounding box for 2D pdf file

Question

Hi,This is regarding creating of bounding box on PDF fileAssume we can get bounding box details from another source.And that is for whole string 18"-1S6(10S)-471454, using that need create bounding box for 471454. To find the differences we manually created the two bounding box Below are the bounding box details also attached the  screenshot.#smaller bounding box"textRegion": {                "xMax": 0.12297021616798368,                "xMin": 0.10935503986439225,                "yMax": 0.6030244780685147,                "yMin": 0.5957594432410297            } Bigger bounding box we got from XML#bigger bounding box"textRegion": {                "xMax": 0.1245098493906997,                "xMin": 0.0782598493906997,                "yMax": 0.6047371474808384,                "yMin": 0.5915995895210239            } So we can observe if we can reduce only xmin and we create  bounding box for 471454 and keep all other values same.As we have to do this for lots of places in PDF, can we get any formula to “reduce Xmin based on bigger bounding box xmin” and use String length.???

Dilini Fernando · Accepted Answer

Hi @shubha k v,I hope Ola's explanation was useful. I'm closing this topic now, but please feel free to leave a comment if you require any further assistance.Best regards,Dilini

Ola Liabøtrø · Answer

Hi!I dont think there is a very good way to do that. You could try to count the number of characters and assume they have ~the same width. If there are then M characters to the left of your new x_min and N characters to the right you would get new_x_min = (N*old_x_min + M*old_x_max) / (N+M), but you can see that the boxes are a bit different in padding around the text, which will be an additional source for error.What is the reason that you want to reduce the box? If the smaller box is what you get from the detect algorithm and you want to compare that with the xml boxes, I can see the point to some extent. For clickable functionality, I would think that having the whole box as a reference would not be a problem.The full text in this case contains both an id/line number for a line, and some metadata for the line. I.e. its diameter is 18 inches I believe. Logically, the whole text is referencing the line, even though you only need the last part to identify it.

Creating Bounding box for 2D pdf file

3 replies

Reply

Cookie Policy

Cookie settings

Reply

Sign up

Log in to the community

Scanning file for viruses.

This file cannot be downloaded

Cookie Policy

Cookie settings