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How does Google Imaging & satellite spying photo analysis work?
I'm a layman, so, keeping it at lay-talk, fundamentally,
how does Google Images recognize two images as having the same provenance? And, is it similar to how software find tanks and missiles in a spy satellite photo? What I have been told is that they both do an FFT on the pixel information, and, from that detailed frequency data, they look for characteristic "signature patterns". But, I know no more than that (and even that may be wrong). Can you shed light (in layman's terms) on this process? |
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How does Google Imaging & satellite spying photo analysis work?
In article
dhosting.com, Liam O'Connor wrote: I'm a layman, so, keeping it at lay-talk, fundamentally, how does Google Images recognize two images as having the same provenance? Google buys the imagery already aligned to GPS coordinates. They then perform additional alignments and merging within their database. It's similar to software that stitches photos into panoramas except that Google has a LOT of data to merge. Your Android phone may even be helping them detect streets and walkways. The super high resolution images that you see on Google from airplanes. Local and federal governments create them for surveying cities, finding diseased plants, finding stagnant water breeding mosquitos, etc. And, is it similar to how software find tanks and missiles in a spy satellite photo? What I have been told is that they both do an FFT on the pixel information, and, from that detailed frequency data, they look for characteristic "signature patterns". But, I know no more than that (and even that may be wrong). Can you shed light (in layman's terms) on this process? I've heard that it's manual, but that's not my line of work. |
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How does Google Imaging & satellite spying photo analysis work?
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How does Google Imaging & satellite spying photo analysis work?
In article ,
says... In article , "J. Clarke" wrote: In article , says... In article dhosting.com, Liam O'Connor wrote: I'm a layman, so, keeping it at lay-talk, fundamentally, how does Google Images recognize two images as having the same provenance? Google buys the imagery already aligned to GPS coordinates. They then perform additional alignments and merging within their database. It's similar to software that stitches photos into panoramas except that Google has a LOT of data to merge. Your Android phone may even be helping them detect streets and walkways. The super high resolution images that you see on Google from airplanes. Local and federal governments create them for surveying cities, finding diseased plants, finding stagnant water breeding mosquitos, etc. That's Google Earth, not Google Images. The web based map uses airplanes too. Some metropolitan areas zoom in to a resolution of a few cm using airplane imagery. Images with an adjustable viewpoint are also from airplanes. That's Google Maps, not Google Images. This is Google Images: https://images.google.com/ You can upload an image and Google will find similar ones. |
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How does Google Imaging & satellite spying photo analysis work?
On 05/19/2014 12:55 PM, Liam O'Connor wrote:
I'm a layman, so, keeping it at lay-talk, fundamentally, how does Google Images recognize two images as having the same provenance? And, is it similar to how software find tanks and missiles in a spy satellite photo? What I have been told is that they both do an FFT on the pixel information, and, from that detailed frequency data, they look for characteristic "signature patterns". But, I know no more than that (and even that may be wrong). Can you shed light (in layman's terms) on this process? Lots of DSP, trial and error involved in calibration and proofing. Mostly automated, ground penetrating radar, bizarre optical wavelengths, magnetometers, etc. all integrated in proprietary computer systems. Between the oil companies and the spooks, remote sensing is very mature and still very secret. FFT analysis can make anything more visible, to a point. |
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