PR Newswire: AltaSens and Apical, a provider of advanced hardware IP cores and software libraries for WDR imaging, announce the development of 1/3-inch 1080p60 HD WDR sensor.
AltaSens' A3372E3-4T WDR sensor uses patent-pending dual exposures in a single frame to create more than 100dB of wide dynamic range for 1080p60 HD imaging. Each exposure is independently adjustable to light levels in any scene. Single-frame dual exposures eliminate the need for a dedicated frame buffer in the camera and provide video, devoid of motion artifacts. The PR also pitch uncompromized low-light performance of the sensor.
AltaSens will be demonstrating live WDR 1080p60 HD video streams during the 2010 ISC West Security Show in Las Vegas on March 24-26.
What's the difference between this and Aptina's HDR sensor?
ReplyDeleteAptina uses an on-chip buffer to aligne the double exposed images at the output.
ReplyDeleteThis approach should be very similar to that of SMaL by using a 2 levels on the reset transistor. Maybe 4-T sensing is not possible ?
This is only my feeling ...
How do they manage to reach 100dB using only 2 exposure times ? My feeling is that either the pixel has a huge dynamic range in usual mode or the SNR curve is not really good !
ReplyDeleteYou can have any dynamic range as you like with double exposure, for example:
ReplyDelete1st exposure time = 20ms and 2nd one = 100ns.
This will give you 106dB dynamic range extension ... So easy !
Yes for sure, you can set all the exposure time you want.. :) But in your case, 200 000 for the difference between the both exposure times induces a huge digital gain for the display to enhance constrast. So you will have either a very noisy picture or you will not see any benefit on your dynamic range extension. Indeed, your image will be to much compressed...
ReplyDeleteTo be clear, you can't have "any DNR you want" with two exposure times. You can have at most double the DNR of your pixel. So, for a pixel with 60dB, you can have at most 120dB (of continuous data).
ReplyDeleteIf you make the difference between exposure times too long, there will be a range of illumination levels that saturate the long-exposure pixel but are below the noise floor of the short-exposure pixel. You'll have a gap in the data.
Can somewhat comment on motion artifact in this sensor
ReplyDelete