Posts Tagged ‘CMOS

19
Sep
09

Wet noodles for drumsticks? NO! it’s CMOS video!

picture-13.pngWith all the rage about the Canon 5DmII for video, and everyone all gaga over the shallow depth of field video for a pretty inexpensive price, you have to remember that with every silver lining, there is a cloud… or something like that.

A nice new music video demonstrates that it’s not just camera motion that CMOS chips distort from reality, even motion within the frame, like a drummer drumming (something drummers in bands simply insist on doing constantly, throughout the whole darn song.)

If you want to have your wet noodle video featured on America’s Funniest Home Videos, then shoot it with a DSLR. Giggle-inducing images after the break. Continue reading ‘Wet noodles for drumsticks? NO! it’s CMOS video!’

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12
Aug
09

The Foundry offers fix for CMOS “Rolling Shutter”

rolshutfix.jpgAfter seeing their corrected footage, I have to say, wow.

Not only does it seem to properly recognize the distortion and correct it, it lets you calibrate it for specific cameras, and it doesn’t correct the whole image, just what moves- so an object moving in the frame (like the bus) is fixed while the street poles are left alone (which a “global adjustment” would distort.)

Hey camera manufacturers… there’s code that solves the problem.
Now you can fix it in the camera and save us the headache of having to process all our footage after the fact.

Very convincing video demo after the break. Continue reading ‘The Foundry offers fix for CMOS “Rolling Shutter”’

03
Jun
09

Ditch mm. Time for AoV.

angles-01.jpgThese days, with so many digital cameras sporting different sensor sizes and different lenses to zoom from here to there, the “mm” reference for that camera means zilch to the end user. Because of this, marketing departments have taken to converting most zoom measurements to 35mm equivalents, even though, aside for those few full-frame DSLRs, there is little true 35mm acquisition taking place any more- especially in the consumer realm.

B&H Photo Video posted a nice article comparing numerous sensor sizes and lens zoom measurements and put all that against an Angle of View (AoV) measurement which makes a lot of sense out of such disparate dumbers. Anyone can spread their arms out in a 90° Angle of View. This is the same for a sub-compact as it is for a DSLR- no matter the individual camera lens measurement in milimeters. A 20x lens is still a 20x lens. Its time we start thinking in new photography terms. Time to ditch the mm and move on to AoV so its easier to explain, and use any sensor and lens in real life.

02
Jan
08

Sony PMW-EX1 CMOS FAILS Strobe Test.

ex1lead.jpgFreshDV shot some interesting footage with the Sony PMW-EX1 and video of a police car with numerous strobes firing clearly demonstrated that Sony’s new flagship SxS camcorder, despite being knighted with the CineAlta badge, clearly has problems with capturing partial-second instances of time.

There is going to be trouble in Teaneck

Continue reading ‘Sony PMW-EX1 CMOS FAILS Strobe Test.’

17
Dec
07

Red Rolling CMOS Shutter Redux, again.

redstrobe.jpgOne of the easiest ways to f— with video is to use flashes and strobes while shooting.

With CCDs, you’ll likely end up with one field of interlaced video completely blown out and the other “half” of the image is normally exposed. Apparently, with CMOS imagers, including the soon to be replaced first 100 RED cameras, strobes and flashes can look like this, where only part of the frame is illuminated. Odd, isn’t it.

The video on the Fini Films Site has lots of strobes popping, and most are captured properly, but a good portion- more than you would expect- aren’t.

Via FreshDV Continue reading ‘Red Rolling CMOS Shutter Redux, again.’

12
Oct
07

Rolling shutter? – Pick the right tool for the job.

cmos.pngAt DVXuser, there’s a detailed article called Sensor Artifacts and CMOS Rolling Shutter by Barry Green. He discusses, and does a very good job at showing a phenomenon whereby the image captured by a camcorder’s imaging chip is not gathered all at once (what I’ll call “progressive” like a frame of film behind a shutter) but may end up being collected across the chip like a farmer collecting corn from his field. This can create footage that has unique problems. He says:

While CMOS and CCD sensors do the same basic job (gathering light and turning it into a video image), they go about it in different ways, and the differences can have very significant impact on your footage… CMOS sensors (equipped with “rolling shutters”) can exhibit skew, wobble, and partial exposure; CCD sensors are immune to those effects. And a CMOS sensor with a “global shutter” would also be immune to them, but since no current CMOS camcorders are equipped with global shutters, a camcorder buyer needs to be aware of what the implications of a rolling shutter would be.

As I read through his article, I thought back to using tube video cameras.

Continue reading ‘Rolling shutter? – Pick the right tool for the job.’