![]() If you are doing mostly visualization and minimal image processing, then CPU is less important. Always pay attention to the maximum supported memory for any system you purchase.ĭragonfly performance will benefit from faster clock speed CPUs and from more cores. Many budget systems will not permit you to upgrade beyond 32 GB of RAM. Note that when building a system, you may wish to have a future upgrade path. If you will work with 25 GB scans, then you should arrange for 100+ GB of RAM). We suggest you equip your workstation for 4x the size of the largest scan that you wish to work with. Some image processing tasks are very demanding of memory. PCIe 3.0) and the power capacity of the power-supply unit (e.g. The constraints are the interface of the motherboard (e.g. When building a system yourself, you must confirm that your system is compatible with your preferred graphics card.
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Differences in fonts and spaciing make it nearly impossible for even the most sophisticated OCR software to identify every character correctly. The problem is that there can be big differences between two different images of the same character. OCR software essentially attempts to 'read' the text represented by the images. In order to create text-based subtitles from an image-based format a process called OCR, or Optical Character Recognition, is used. Why Use VobSub? The real advantage to VobSub is its similarity to DVD subtitles. However, in recent years the growing popularity of the Matroska multimedia container has been a bonus for people who prefer this subtitle format because it can be muxed into MKV files so it's no longer necessary to have a separate file for subtitles. They're also not generally supported by DVD players, even when they're capable of playing formats like MPEG-4 (DivX, XviD, Nero Digital, etc.). Since they're stored in a separate file VobSub subtitles are extremely portable. Information in the IDX file tells media player software the color of the subtitles, their position on the screen, when they appear and disappear, and a number of other important pieces of information. They're generally referred to as either VobSub or IDX + SUB (IDX/SUB) subtitles. SUB and additional information in another file with an extension of. In fact, VobSub basically just re-packages the images from the DVD into a file that has the extension of. VobSub Subtitles VobSub subtitles have become very common because it's easy to get them from DVDs. AVI was/is the most common container for MPEG-4 ASP video encoded with codecs like DivX and XviD, and was also the format first added to DVD players for MPEG- support. While AVI files can't contain graphic subtitles, they can have text subtitles. Perhaps the biggest reason for the widespread development of text-based subtitles is their use in AVI files. But if you happen to belong to the small minority with a need to make subtitles you'll have to at least start with a text-based format. Creating subtitles isn't exactly something most people have the inclination (or time) to do. Since editing a text-based subtitle can generally be done with even a simple text editor like Notepad they're the easiest to modify and by far the easiest to create yourself. The Big Advantage to Text The important thing about any text-based subtitle format is that you do have the ability to edit subtitles easily. Still, there are times you need to understand the difference and know which you have or need. It's not necessarily important to understand how either type of subtitles work, or why a particular application uses one or the other. These images are put over the top of the video frame when displayed. Much like the way characters on older text-based computer interfaces, they're actually just a collection of dots on a grid. They're actually encoded as raster graphics. As a matter of fact subtitles on DVDs aren't actually text. Although it's normal for all subtitles to start out this way, that doesn't mean that's how they're stored. Since text is also some of the easiest data to store and compress it makes sense to store subtitles as simple text files or a text stream within a video file. Images Most subtitles consist purely of text characters. Then we'll take a look at three specific subtitle formats VobSub, SubRip, and SubStation Alpha. First we'll be considering the difference between image and text based subtitles. But we'll still be considering two categories. For our purposes we'll be focusing on subtitles that exist as separate streams in a video container, or even separate files entirely. They can be hard coded or separate streams, depending on whether they're encoded as part of the video or simply muxed into the same container. ![]() They can be mandatory or selectable, depending on whether they can be turned off. Subtitle Categories There are many ways to categorize subtitles. With a little bit of reading it becomes easy to figure them out. Ironically, for most people subtitles are much easier to grasp than other multimedia elements. Even they're found on nearly every DVD, with the complexity of dealing with video, audio, and menus it's common for people to leave them for last, and often they get ignored completely. Subtitles may be the least understood aspect of digital video. It's important to always whiten your teeth with the guidance of a professional. These people may end up with different colors in their smile, which probably defeats the purpose of treatment.
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