j4nu wrote: snapsy wrote: tctmp wrote: chiron wrote:
Does dual-gain require a specific chip or other specific hardware for its implementation? Or could it be added to exisiting cameras via a firmware update (though, even if possible, Sony might choose not to do that)?
The two amplifiers are already there. You are asking whether the merging of the data needs additional hardware or can be done in software. If both data are kept at the same time, then in theory it can be done in software, though it probably is serious software revision which is very unlikely for any current cameras not already having it. But depending on the chip architecture, (the processing unit, not the sensor), both data may not even be stored at the same time. the data path may choose only one or the other. In that case, chip architecture needs to be replanned to provide this.
Agreed. I've read through patents of various HDR implementations and some interleave the multiple-exposure/gain data read off the sensor, requiring ISP ASIC logic to process the data, whereas others dump them into separate frames that are more amenable to firmware processing.
If A7V doubles the number of bands in DGO, doesn't that mean it reads separately (or 2x slower) for low and high gain?
Yes, but the A7V only uses DGO with the mechanical shutter so the 2x readout speed occurs after the exposure is over and the mechanical curtains shut, so it has no impact on rolling shutter artifacts like banding.
Dec 14, 2025 at 12:10 PM
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