WDR tech for telecine?

[luuude]

Does anyone have experience with WDR(wide dynamic range) sensors and cameras? Its intriguing but i am scared that there is a lot of autostuff going on that I cannot control. WDR seems to be the term the manufactures use mostly but HDR is also used sometimes. I have been looking around a bit and there seems to be 3 technical solutions to this, either multiple exposures of 2 or more frames with different shutter time or new sensors with arrays of two differently sensitive photosites(aptina mt9m024 and others) or logarithic sensors(expensive and lowres?). I realize that its possible to just do this myself by telling a camera to take multiple exposures of the same frame and sorting them with e.g avisynth and have full control of the process. But I like the simplicity of just having the camera do it for me. I find that its possible to capture the whole range with my current setup but only from scene to scene. I usually have to make a compromise of slightly overexposing some scenes and underexposing some. Probably due to blooming in the original capture where bright scenes have brighter blacks due to scattered light in the often cheap lens on super8 cameras. And also the same in my optical path, some contamination is probably there. I have no idea how good this technology is but the CCTV companies boast of VERY wide dynamic range. This is usually delivered in 10bit and usually the gamma is adjustable so i can pack some more data from the HDR process into that 10bit image. Usually my stuff goes through 8bit a process though so any adjustment of gamma an such on the captured image needs to be done before that. But how does this work on filmscanning? Since there will be no movement both techniques would yield the same image it seems but I guess the multiexposure will have higher resolution from the same sensor pixelcount and probably also bigger photosites unless the sensor with advanced dual exposure photosites are bigger. The 16:9 res is not that bad, but its a pity throwing so much info away. Any thoughts from you machine vision camera gurus?



some links.

quite cheap and nice usb camera for diy hdr
http://www.ptgrey.com/products/chameleo ... camera.asp

Logarithmic
http://www.ids-imaging.com/frontend/pro ... cam_id=123


just an example of a typical cctv wdr cam.(HD-SDI at 10 bit)
http://www.exelontech.com/product/produ ... labGNPZEZV

pretty cool tech and cheap at $399 (HDMI at 8bit probably)
http://www.latticesemi.com/products/dev ... wvideo.cfm

Best regards

Ludvig

[Andreas Wideroe]

It's also called TDI.

Are you looking for area scan cameras (full frame) or line scan cameras?

[Andreas Wideroe]

Correction: Seems you're looking for an area scan camera. TDI is not available for this as far as I'm concerned.

You might want to check into linescanning. It's pretty awesome (and expensive).

/Andreas

[Tomrussel]

I don't think its available.Basically all are using autostuff.Line scanning is better.

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