a reply to: wmd_2008
Ahh I can not argue with that low quality is right, pelco spectra and they cause migrain's just watching the feedback, the live feed was never too
bad, still not photographic level - a mate has a collection of cameras and is an amateur photographer, love's his fairly vintage eos the best for some
reason, then again I also knew a guy who still used an old soviet made camera with east German optic's and a cloth shutter, he actually used to
holiday in the USSR during the cold war but claimed you could buy thing's like that camera for a steal due to the then very favorable exchange
But given the compression rate that Pelco installer's here in the UK put on there DVR (hard drive's) even the relatively Ok'ish image from a spectra
system dropped down considerably and that is an understatment, it was not even half VGA resolution so you had to be eagle eye'd (And get your
statement and crime (incident report's and police log number's, crime sheet number's etc) report done as quickly and efficiently as you could) to
catch the thieve's and purse snatcher's as half the time the CCTV image was inadmissible due to it's extreme low quality after that compression had
been applied to it, I wanted to reconfigure it and store the data at a higher resolution but the system admin would not allow it even though the
file's only used a tenth of the available HD space, ancient history now thankfully let some other sap work with it.
Needless to say I looked with envy on the new ultra high definition PTZ's and high resolution storage that were then coming onto the market (But
mostly used for air port's and air field monitoring as they were quite expensive).
And you do make a good point about pixelation, you know one of the US agency's actually had a very powerful program that could extrapolate - if there
were enough image's at different angles, preferably moving image such as CCTV footage and create a fairly good restored higher resolution image by
interpolating the data, of course I would assume that it would still not be as good as a native image taken at that resolution.
I am also fully aware of Jpeg compression and BMP artifact's, colour sampling artifact's that can both obscure detail and create phantom detail etc
and that the NASA rover is by nature prone to these depending on the sampling rate of it's CCD's and also the compression necessary to send that data
back to mission control.
For this reason Analogue imaging technology will always be better but of course far less practicle, analogue imaging can of course also pick up
detail that the HUMAN eye's or in the case of Audio ear's can not hear, I can actually hear the difference in an analouge recording and a 256 bit
audio compression, higher quality digital still dont sound as good to me but I can not distinguish them from lower ADC sample's especially if they are
put through a decent DAC.
SO I am aware of what you are talking about, I still disagree on this point as you singled out my comment for attack simply because you are annoyed
at other's point's of view and once again I reiterate your point of view is actually no more valid than any other's except in your professional field
as that has been your career and by dint of it's nature you had to be aware of all possible methodologies that it required, Given your period in that
profession I believe you worked through the transition from Analogue to Digital imaging and probably prefer the Analogue as do I.
Having looked at several image's I do believe that Airbrushing was performed but the modern (Digital compressed) image's are far more problematic for
these reason's and unless the iamge is bang on in the reticle and zoomed it can be argued that they provide flawed evidence of even accepted data.
So I prefer the analogue film from the apollo mission's etc and of course you yourself are I assume versed in Air Brushing technique's, I make this
assumption as to the length of time as a photographer (And I assume image fixer since not every shot is perfect and sometime's you need to save the
shot to make it presentable/salable etc and so many photographers do so rather than scrap good shot's just because some idiot in the crowd make's a
finger gesture that you don't want on that particular image).
And I will say this as far as Spectra were concerned, Frustrating so your eye's (And all your other senses) are the first line of defence and
detection and the CCTV served more to raise potential suspect's etc and to act as a baseline visual deterrant.
So I personally used to start my shift and end it with a full perimeter sweep to ensure the site's were safe and secure, intermittent patrol's
switching with my colleague's and ensuring all the other security system's EAS tagging etc were in place as well as checking vulnerable spot's were
the coverage was not good or even non existant (Tesco in the UK love to save money and just do not comprehend the fact that as well as better quality
they need full coverage in order to maintain CCTV scone (sorry it mean's Selection, Concealment (if they conceal some just try to walk for the
door's), Observation (must be 100 % for it to be valid any lapse and you lose the chain of evidence and can only make an informed guess) Non Payment
(retail obviously or past the last point of sale without paying - nab them as they exit the premises) and Egress (leaving without having first payed -
yes it sound's like teaching your granny to suck egg's but even the best security make's mistake's).
Now I had some funny experience's, lost the plot on one occasion and gave chase to a knife wielding idiot whom had slashed my belly (only scratched
it) only to see him nearly get himself killed (I would NOT have hurt him only restrained him to pass onto the relevant authority's/police) so you were
saying about experience, believe me I have quite a few and had to act as professional witness on more than one occasion in the course of my job, being
stabbed with a syringe was always my worst nightmare though and I managed somehow to avoid that little occurrence, some of my colleagues were not so
lucky, one guy lost his wife because he was put on medical leave until he recieved a medical all clear, the stress of not knowing if he had contracted
a disease from the junky (Smack head) tore his family apart, he could not use the same toilette, sleep with his wife and was afraid of exposing his
kid's to it if he had contracted anything, needless to say he jacked the job in once he did get the all clear. ( just a not to any would be security
- it is an awful crap and thankless job forget about it but you are not supposed to chase people if you are civilian security in the UK, insurance and
in case they get hurt and turn around and sue you but adrenaline etc).
edit on 5-1-2017 by LABTECH767 because: (no reason given)