One of the major criticisms of DSLRs, and specifically Canon DSLRs, is the use of a rolling shutter that produces motion artifacts. This rolling shutter effect is very prevalent in video with Canon DSLRs thanks to the readout method of the CMOS image sensors.
It has certainly improved with recent models (the 5D Mark II was a mess and the 5D Mark III is much better) but Canon is continuing to refine the process and reveals some of the methods it is seeking to use in a pair of recent patent applications.
Two patent applications filed in March of this year and published earlier this month via the USPTO highlight Canon’s global shutter development for CMOS sensors. Of course, there’s not a whole lot of practical detail in there for the average shooter. If you’re an engineer, however, you might get more out of it than the rest of us.
The important takeaway is that we should continue to expect the rolling shutter problem to go away as Canon (and others) develop better readout systems for their CMOS image sensors.
If you’d like to take a look at the technical details, you can read the patent applications embedded below.