I have checked out many methods like Yolov3, SSD (single shot detector), etc with very promising result in detecting a rectangular box around the object, But could not find any method, which outputs rotated bounding box.
Image
can someone guide me with the resources to get a green colour Bounding Box instead of red colour in the image which I have attached
Related
I'm training an object detection model with Tensorflow (fine tuning from ssd_mobilenet_v2_320x320_coco17_tpu-8) and monitor the training task with tensorboard. I was expecting in the Images tab of tensorboard that images that are displayed would show a bounding box. What I see though is only images with an orange line drawn above the picture (the same orange that I expect for the bounding box). Am I missing something? Am I right when I say that a bounding box should appear or not? Picture of what I see is joined. Any help greatly appreciated.
Unwrapped object was filled out with gradient color. As illustrated in below image, some pixels in UV/Texture view on Seamed edges boundaries are not filled with expected color. It looks like edge has to cross more than a half of the pixel to be colorized.
Is there a way to force all pixels crossed by Seam edge to be colorized properly?
Found a solution. Navigate to Texture Paint for given object and open Options, modify Bleed property, which defines how many pixels will be colorized in UV texture outside Seamed edges. Default is 2px.
I've just started using Apache PDFBox and I'm completely baffled as to what is meant by stroking, non-stroking and filling when applied to text and lines.
Please can someone point me to a reference / guide which explains what these terms mean (for beginners) and what the difference is between them.
Its pretty simple. Consider a rectangle located at 0,0 and 50 units wide and high. That is described as a path with vertices at 0,0 0,50 50,50 and 50,0
Now, if you stroke the path (imagine drawing along the path using a pen) with black. What you get is a black square, the interior of the square is whatever was on the paper before you drew the border (probably nothing, so white).
If you fill the path, you get a filled in square, but no border drawn.
If you fill and stroke the path you get a filled in square with a border. Because the fill and stroke colours can be different you can have the square filled in one colour and the border drawn in another.
See the PDF Reference, section 4.4 "Path Construction and Painting"
Update (by -kp-)
I've copied the following table from the official PDF-1.7 specification:
This table shows the different text rendering modes. Here too, you can stroke or fill or do both to glyph shapes. You can even do neither stroke nor fill, but still define the shapes: that is, you get invisible text -- a very useful mode for placing OCR-ed text on top of a scanned image! It makes the text searchable, copy'n'paste-able and screen-reader aware.
I am currently writing a book The ABC of PDF with iText that introduces you to all these principles.
You are talking about the "Graphics State" and syntax that is used to define objects on a page. This syntax is stored in content streams.
Ignoring "Text State" (a subset of "Graphics State") for the moment, the idea is that you create paths and shapes (shapes are closed paths). These path and shapes can be drawn using stroke and fill operators. If you fill a path, you need to define whether you're using the non-zero winding rule or the even-odd rule (if you've studied geometry at college level, you've already encountered these rules).
Stroke and fill operators will use the colors of the current graphics state. Lines will be drawn using the stroking color. Shapes will be filled using the non-stroking color.
There's much more info in the free ebook you can download from Leanpub.
I have about 400 pdfs with a lot of dead space between the text and the page border.
Usually I'm using govert's pdf cropper to crop all the whitespace, but this time the pdf background color is (darn!) yellow,
and no software which I know (and I've searched for quite a while) can crop non-whitespace
(well, except maybe pdfcrop.pl -a Pearl library which supposedly can remove black spaces).
Anybody knows of a software that can perform such task?
The ideal app, I guess, would have the option to receive specific color to remove,
like rgb(192,192,192).
Thanks in advance.
The reason this is so difficult is that PDF has no concept of paper color or background color. So what you're seeing is not a different background color, but an object (typically a rectangle) painted in that yellow background color.
Most cropping tools simply calculate the bounding box of all objects on the page and then crop away everything outside that bounding box. Of course that doesn't work for your file because the bounding box will include the background rectangle object.
There are potentially a number of directions you could take this:
1) If all pages need to be cropped by the same amount, you could attempt to do cropping that way (simply passing a rectangle to the cropping tool to do the actual cropping).
2) There are tools (callas pdfToolbox - watch it, I'm associated with this tool, Enfocus PitStop...) that allow you to remove objects from a document and this could be done by specifying your yellow color. This would allow you to modify the PDF file by removing the background object and then perform the cropping you want to perform.
Is it possible to invert the colors within a box (4 sets of coordinates) on a page from within the page's content object code?
My pages consist of simple B&W JBIG2 images and I wish to make the white black and the black white within a small box to highlight something.
As mkl suggests, you may extract the images and change their bits - this might prove to be a little bit of work however. There might be another useful approach here, specifically useful because it would work regardless of what the underlying objects are.
It is possible in PDF to add a transparent object (for example a rectangle) over all underlying objects. In your case you would create a rectangle that you put on top of the images you already have in the page stream.
If you paint this rectangle in white, set it to transparent and choose "Difference" as the transparency blending mode, the net effect should be that the colors underneath your rectangle are inverted.
From the PDF specification: "Painting with white inverts the backdrop colour; painting with black produces no change."
This may be the quickest and most painless way to accomplish what you are looking for...