Digital WDR

Hi, This is my first post here. I must say IPVM is a very interesting platform for surveillance professionals, since we get an unbiased view. Thanks John.

I have a very basic question. Of late I am seeing very high values of WDR in range of 120dB (esp in cameras using Sony Effio) and they are termed as Digital WDR. What is Digital WDR and how is it different from actual WDR values we see in datasheets of reputed mfg like Bosch, Panasonic, etc.

I read somewhere that there are two types of WDR -

a) WDR achieved by double exposure: one exposure with longer exposure time to get the detail in dark area and the another is taken with shorter exposure time to get the detail in very bright area. Then the two pictures are combined in the DSP of camera to a single frame OR

b) Digital WDR which is available in low end cameras

It will be great if you guys can throw some light, so I can educate the customer to make the right choice.

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