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what is the efficient way to create movie clip of 1 minute graph evolution ( quality is not an issue) that will take the lowest amount of disk space?
Any modern video (distribution) codec will produce a very small file in this case, if it is fed with standard parameters. So you will be on a good way if you just create e.g. a H.264 clip in MP4 file format. The only tweaking option that makes sense in that case is the GOP size, but that makes seeking in the file slightly harder for the player.
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Basically I need to extract the identification number of marathon runners from the image. Till now I was able to get the bib part alone from the whole image. Now I need to extract the numbers from that image:
I need to extract 1430 from the image. I have tried some methods like OCR and blob detection techniques but they are not successfull for all images.
Have you tried using Stroke Width Transform (SWT)? You can find a Matlab implementation of the first stages of SWT here.
Take a look at this example in the Computer Vision System Toolbox.
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I have tried manual detection using LS polynomial fitting here. But that cannot be used in my project as mine has to be a fully automated system.
Take a look at the Scale-Invariant Feature Transform, or SIFT. This video explains it well. You "train" a detector with one or more images of eyelids, and the detector locates similar regions in the input images. It's the de facto general purpose feature detector - although more specialized tools like face detectors are faster.
The "Scale-Invariant" part means that it can detect the same object at different sizes and rotations.
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do they store the hashes of the videos and then compare them? how do they know that you had already uploaded that video? there are plenty of videos on you tube that have the same file name and file size.
They likely do hashes. But since Google acquired YouTube, there's a lot more intelligence in their code. Google and others have been working on creating "digital fingerprints" for media like movies, where defining characteristics become part of the same result even if the file is mildly tampered with. Because this is an ongoing race between (loosely speaking) "pirates" and "the Powers That Be," there's research ongoing on both sides of the fence, and the algorithms involved are likely to be kept as industry secrets.
(a good excuse for me to only give you this vague, hand-waving explanation instead of some useful facts).
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Does anyone know how to make a movie (avi / mpg) thats uploadable to YouTube from a series of PNG images? Also, how would I add a .caf audio file to that videostream?
There are plenty of libraries like x264 to do this type of thing for you, but you'll probably need to use a library. Video encoding is not an easy task.
I'm pretty sure you can do it with ImageMagick which has been ported to the iPhone Try the 'convert' command. (I haven't done this myself, so you might need to do some research on the latest iPhone port and how to use the command.)
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I'm trying to get our video files (m4v) converted to the Apple http streaming and ran into some questions.
I have a file that is 6mb in size and when I pass it through the segmenter using all default settings the files that output add up to 32mb in size. The last file is 17mb in size.
I'm not sure if that is how it is supposed to be but I'd rather use the smaller file if that is the case.
Anyone have any luck with this for vod content?
I had the same problem, there is an "optimise" setting in the install process that needs to be set.