Author Topic: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK  (Read 4844 times)

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Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #25 on: August 03, 2021, 02:21:19 pm »
At long last I have gotten round to getting out my TCX camera, giving it volts and connecting it to the local area network so that I can share some images.

Here's a view of the camera and supplied mount propped up on some shelves in my workroom, plus a view from the camera when I temporarily hung it out of an upstairs window. For scale, the red X would be about 100m away if it was actually nailed to that building. People moving around are perfectly visible at that distance although they don't come out too well in stills. I estimate you'd see people at up to about 200m.

Video looks quite highly processed, though there are all sorts of tweaks you can do via a browser in the (quite comprehensive) user interface.

I'm pretty certain the native resolution of the camera is 320x240, although the streaming software would have you believe it's actually 640x512.

I have had it running successfully on one of the Arbor tablets (Win XP) from Fraser using the browser K-melion (no, I hadn't heard of it either, but it came up when I searched for a more-modern browser for XP).
« Last Edit: August 03, 2021, 06:16:04 pm by Ultrapurple »
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Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #26 on: August 03, 2021, 02:58:00 pm »
And, since so many of you didn't ask, here's a shot of the UI running on the Arbor tablet in its chunky docking unit.

I don't know why it has such a bright pinkish light on the dock and I haven't yet found out how to switch it off. My guess is that it provided some ambient light when the tablet was in use by a patient's bedside - but it switches off the moment you shut down the tablet or remove it from its cradle. And it's not a 'battery charging' light either.

I might have to resort to reading the manual  :scared:
« Last Edit: August 03, 2021, 03:45:54 pm by Ultrapurple »
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Online ArsenioDev

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #27 on: August 03, 2021, 06:05:30 pm »
That is absolutely a QVGA image, way too fuzzy to be VGA.
 

Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #28 on: August 03, 2021, 06:17:18 pm »
That is absolutely a QVGA image, way too fuzzy to be VGA.

The real joke is that the camera streams it at 1280x1024.
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Online ArsenioDev

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #29 on: August 04, 2021, 03:35:32 pm »
w...why? that's painful
 

Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #30 on: August 04, 2021, 04:13:09 pm »
I don't really know why. I believe there's a version of the camera that has a 640x512 sensor so one can sort-of see why a 2:1 upscale might make (marketing?) sense, but the aspect ratio of 320x240 simply doesn't play nicely with an upscale to 1280x1024.

If anyone knows the answer then I'd be fascinated to learn the reason.
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Offline Fraser

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #31 on: August 04, 2021, 10:09:21 pm »
This is CCTV so some standardisation in camera resolution between VL and different resolutions of thermal cameras comes into play. The Monitoring station displays the CCTV scenes at 1280x1024 and no matter what camera is viewed, the image fills the display. FLIR have a foot in both the thermal imaging and CCTV camps so such “standardisation” of resolution is possibly to be expected where their CCTV systems are concerned.

As a side note, are all 1024 rows used for the streamed image or is it really a 1280 x 960 image plus telemetry in rows 961 to 1024 ?
« Last Edit: August 04, 2021, 10:18:08 pm by Fraser »
 

Offline Fraser

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #32 on: August 04, 2021, 10:42:35 pm »
Is the camera operating in letterbox mode with 32 pre image blank rows, 960 image rows and 32 post image blank rows ?
« Last Edit: August 04, 2021, 11:12:22 pm by Fraser »
 

Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #33 on: August 05, 2021, 07:51:53 am »
As a side note, are all 1024 rows used for the streamed image or is it really a 1280 x 960 image plus telemetry in rows 961 to 1024 ?
Is the camera operating in letterbox mode with 32 pre image blank rows, 960 image rows and 32 post image blank rows ?
No, there are no telemetry rows or blank lines.

It's possible to add telemetry-type info (date, time, your logo, several lines of arbitrary text...) but they are all overlaid in the active image area.

I'm using the Arbor tablet to monitor the camera temporarily set up looking at my back garden. As I type this at 8.30 in the morning I saw what initially looked like a fox creeping across the distance. Then I realised that it was an illusion: I'd actually seen a cat, which had been made to look lower and longer than normal by the 4:3 > 16:9 distortion. (She's called Princess Leia and belongs to a neighbour).
« Last Edit: August 05, 2021, 08:10:47 am by Ultrapurple »
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Offline Fraser

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #34 on: August 05, 2021, 09:37:05 am »
Thanks Ultrapurple. As you say, upscaling 240 image rows to a 1024 row display is an ugly thing to do
 

Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #35 on: August 05, 2021, 10:00:22 am »
Almost as bad as those field scopes that upscale 320x240 or even 640x480 / 512 onto an 800x600 OLED.

But not as bad as the manufacturer (who shall remain nameless) who downscales a 1024x768 sensor onto a display of just 800x480...
« Last Edit: August 05, 2021, 10:31:32 am by Ultrapurple »
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Offline Fraser

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #36 on: August 05, 2021, 12:54:23 pm »
The penalty we have to pay for a pixel based display system rather than ‘gud ol’ anlog’ raster scan systems  ;D

I remember my first LCD computer monitor and was horrified at the blurry display until I read the manual and realised that my computers resolution should be set to the LCD panels native resolution. I was used to CRT monitors just auto adjusting to different video card output resolutions with no apparent issues. Relying on an LCD monitors ‘auto adjustment’ compatibility modes creates some pretty nasty results when the source and panel pixels counts are not directly scalable. I heard that some 4K TV’s make a real mess of SD images whereas HD 1080 TV’s manage a decent scaling of SD. Pixels, Pixels, Pixels…… it is all about the pixels  ;D
« Last Edit: August 05, 2021, 01:12:55 pm by Fraser »
 

Offline Ultrapurple

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #37 on: August 05, 2021, 01:11:22 pm »
Oddly, my 4k TV seems to give a remarkably good picture on normal, 720p, 1080p and 4k material. Much better than its predecessor, which was supposedly full HD but which actually had a slightly-less-than-HD panel (I think it may have been 1680x1050), meaning that nothing lined up, horizontal or vertical, leading to horribly soft pictures.

Before I discovered that Marketing's idea of "Full HD" didn't necessarily mean 1920x1080, I spent endless frustrating hours trying to get a pixel-perfect display out of a Raspberry Pi (back when they were new). It was a lost cause.
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Offline tommyd

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Re: FLIR T4325ZS 320x240 25Hz PTZ cheap on eBay UK
« Reply #38 on: August 07, 2021, 11:26:41 am »
hi all
anyone know what camera core is inside one of these
cheers
 


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