I need to be able to bulk sort through images that contain a graphic and remove these images from the folder. The graphic is a ruler-like image for scale.
I'm a novice with FFMPEG, but have already written a batch script that resizes images. The logic seems pretty understandable, however my issue is that I don't know what and where to research for a solution to my problem. From what I read, imagemagik might also be a great tool, but I feel more comfortable with FFMPEG.
I expect the script to look through all image files in a folder and find those the contain the ruler graphic and remove the said images with the rule graphic from the folder. The images are product shots on white backgrounds and the rule graphic is not overlaying anything or acting like a watermark.
Ideally, if possible, a way to crop out the graphics would be an amazing next step.
Related
I am stucked by a video processing feature, Specifically, upload an image and then generate a video based on various video templates.
Here are the video templates:
http://video-static.biku8.com/data/video/template/3286012076458048/7437ab55-2e83-4a36-9046-5708fcddf4c1.mp4
http://video-static.biku8.com/data/video/template/3274256089907264/ae8fa3f7-6c9c-45ca-810f-48db92cc14cb.mp4
http://video-static.biku8.com/data/video/template/3213894231425088/bf107d439b9043a58c1ea0ba26f811db_template.mp4
...
As shown in the video templates above, I just need to upload a photo to generate a great video.
My question
What is the specific idea for implementing this video?
Which third-party libraries are needed? (ffmpeg, opencv)
PS: I am using dlib and opencv for face recognition. I can generate face image, but I don't know how to insert face image into the correct position of these template videos.
I would suggest you to follow the below 3 steps
Load the template video by opencv, you can access the video frame by frame
Modify each frame, one by one.
Save frame to video stream writer
Regarding step 2, actually, you must copy the uploaded image to the each frame by a mask (the pixel from source image would be copied to destination image if its coordinate on the mask is non-black). The mask could be defined by a list of points OR by an image. You should pre-define a mask for each frame in a file. Then load the mask for each frame and copy.
How to read video, save video OpenCV read-write Video
How to insert image to another image Copy non rectangular ROI
Generating videos like them are all not easy tasks. I recommend to use Adobe After Effects or other video creating software (with some scripts and actions) if you don't need to generate it by a single program or program language.
Then, I answer them below when you need to generate it by programatically.
For the first one, you should recognize faces and bones. So you should use OpenCV. ( I recommend to use tools like OpenFrameworks or TouchDesigner and so on. )
For the second one, I don't know what you exactly want, but if you want to recognize the position of the bottle dynamically, you have to use deep learning or other way to detect it. Then you may need TensorFlow or OpenCV. ( If you just want to merge layers, you can use ffmpeg etc. )
For the last one, you should split the video frame into the boxes, then you have to control. I think there are many ways to implement this. I may use OpenFrameworks, TouchDesigner, vvvv, or Processing.
I think using ffmpeg for them is not recommended. This tool is not the best for generating complicated video. But ffmpeg will do good, for example if you just merge two videos with alpha.
How can I overlay an image onto a video without changing the video file?
I have many videos and I want to be able to open them and overlay a ruler onto them and then measure the distance an individual moved visually. All I want is to play a video and then to open up an image with some transparency and position the image over the video. This way i would be able to look at the video and see how far the individual moved.
I would like to do this without having to embed the image like a watermark, because that is computationally expensive. I would need to copy the video, embed it with the ruler and then watch the video, then delete that video file. This seems unnecessary. I would like to just watch the video and have a transparent image over it while I a watching.
Is there a program that does this all together?
Alternatively, is there a program which I can use to open an image and make it transparent and then move it over the video that is playing?
Note: I am using Windows.
It sounds form your requirements that simply overlaying a separate image layer over the video will meet your needs.
Implementing this approach will depend on the video player client you are using, but you could implement an HTML5 based solution and play the videos locally with this (or even from a URL on the web if you have them there).
There is a nice answer with a working fiddle which shows how to do this with HTML5 here: https://stackoverflow.com/a/31175193/334402
One thing to note - you have not mentioned scale in your question. If you need to measure how far the person has moved in real distance, rather than in just cm's across the video screen, then you will need to somehow work out the scale of the video. This makes things considerably harder as the video may zoom in and out during the sequence you want to measure, so you would need some reference to calculate the scale for each frame. One approach would be to use the individual as a reference, assuming they are in all the frames you are interested in.
What about using good old VLC for that?
Open VLC go to Tools→Effects and Filters→Video Effects→Overlay and select Add logo checkbox:
Then, add your transparent overlay image and play any video with VLC. The output looks like this:
I am using matplotlib to draw a graph using some data and I have saved it in Pdf format.Now I want to add a logo to this file.How can I do this.
Thanks in advance
If you can do it the other way round, it is easier:
plot the image
load the logo from file with, e.g. Image module (PIL)
add the logo with plt.imshow, use the extent keyword to place it correctly
save the image into PDF
(You may even want to plot the logo first, so that it stays in the background.)
Unfortunately, this does not work with vector graphics, but as logos usually are not that large, you may use a .png or even a .jpg.
If you already have the PDF's then this is not a matplotlib or python question. You need some PDF editing tools or libraries to add the logo. Possible, but an entirely different thing.
I'm building a web application (RoR) that manages images that are in raw image format. I need to create thumbnail/web versions of these images to be displayed on the site. Currently, I'm using imagemagick, which delegates to dcraw to produce the jpeg thumbnail. The problem I'm running into is that the thumbnail deviates from the look of the original; the image gets darker and the white balance is sometimes heavily shifted.
I'm assuming that the raw format default setting can't be read by dcraw, and thus it's left guessing how to parameterize the raw conversion. I can play around with customizing these setting, but it seems getting it right on one image causes others to be further off the mark.
Is there a better way to do this in order to get a result that more closely mimics the what I might see in a raw viewer like photoshop, or even Mac OSX preview? Given that Mac OS X supports a variety of digital camera raw formats, is there anyway to utilize the OS's ability to render preview images (especially considering that result is what is expected).
The raw images that I'm using are 3FRs and fffs (both from Hasselblad).
I can post samples if people are interested.
Thanks
Look at "sips" and "Resizing images using the command line" to get you started.
I use Abbyy FineReader for ScanSnap to OCR a couple of scanned PDF files. The software claims it retains the original PDF images. The PDF file sizes pre-OCR and post-OCR are almost identical, which is good.
After the software is done, all PDF images appear anti-aliased in Acrobat X. Page navigation is much slower than before, and when I zoom in/out, the images first go to what looks like the pre-anti-aliasing version before quickly changing to anti-aliased images.
Left: Scanned PDF / Right: after OCR with Abbyy
I would like to get the original images without anti-aliasing back. Interestingly, when I open a single page from the anti-aliased PDF in Photoshop, there is no anti-aliasing and the image looks like the left one.
My limited PDF programming experience leads me to believe that Abbyy likely sets some kind of anti-alias flag for each image during OCR processing. How do I un-set this flag?
Any pointers to useful ideas would be much appreciated.
After the software is done, all PDF images appear anti-aliased in Acrobat X. Page navigation is much slower than before, and when I zoom in/out, the images first go to what looks like the pre-anti-aliasing version before quickly changing to anti-aliased images.
Actually in the original file 2013_11_15_22_51_31.pdf contains a JPEG image while the OCR'ed file 2013_11_15_22_51_31_OCR.pdf contains a JPEG2000 image.
Comparing them in third party viewers, it becomes clear that the image in the OCR'ed file is not inherently anti-alias'ed. Furthermore there is no evident flag in the PDF instructing PDF viewers to apply anti-aliasing to the JPEG2000 image. Thus, Adobe Reader seems to automatically render JPEG and JPEG2000 images differently, applying anti-aliasing to the latter but not to the former.
Comparing both images in detail, though, it becomes clear that these images are not identical but instead the image in the OCR'ed PDF is slightly rotated.
I assume Abbyy FineReader recognized that the original scanned image is not correctly oriented. Thus, it rotated it slightly to correct this orientation.
Thus, replacing the image in the OCR'ed version with the one from the original one is no option: Due to the rotation the OCR information would partially be somewhat off.
What you might want to try is to recode the JPEG2000 image to JPEG and replace the image in the OCR'ed version with this recoded one. This will mean some loss of quality but most likely you can get rid of the anti-aliasing this way.
Be aware, though, that the JPEG2000 image is slightly larger than the JPEG image to accomodate for the rotation.
PS: As #VadimR pointed out, there is indeed an /Interpolate true entry in the image dictionary of the OCR-ed version I missed when looking at the file. This does not seem to be the major issue slowing down the rendering.
There is /Interpolate true entry in image dictionary of OCR-ed version, and that's what causes 'anti-aliasing'. Whether that (and not JPEG2000 instead of JPEG compression) is a cause of slow-down, you check on large enough files.
To un-set this key, the best would be to turn it off while creating a file, and if that's not possible, to write and run a small program in suitable language.
But, since your file doesn't sport 'compressed objects' and offending key is in plain view inside a file, in the spirit of 'job done quickly' you can simply process your file e.g. like this:
perl -M-encoding -0777pe "s!/Interpolate true!' 'x17!ge" <in.pdf >out.pdf