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Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

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Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#191

Post by danpat »

jpap wrote: post #118
smith7018 wrote: post #113

Earlier quoted context omitted.

Man, I hope I'll know as much as you do one day... Congrats on the app! I just bought it and I'm really liking it! One suggestion; would outputting to a gif file be too difficult? I could really see people using this to create gifs of their lives that they could share to Tumblr or Facebook.

Thanks! :-) To be honest, none of my formal training prepared me for what went into SnappyCam---only the "how" to go about learning to do so. I'm sure you could pick up a few tricks in the same way by working on a cool pet project or two. With so many recent requests for AGIF, I'm absolutely going to add it to the app. (It's been on my list for a while, but lower priority than getting up a solid core product and the…

Hah, I told you getting your PhD was a waste of time ;-)

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#192

Post by danpat »

jpap wrote: post #166
josh2600 wrote: post #161

Earlier quoted context omitted.

Have you thought about displaying a semi-transparent bar to show the buffer? Or maybe a one or 2 px white mark creeping up the side of the screen (turning to red as it get towards the top)? Just some thoughts. If you have a buffer, and I'm gonna get fubarr'd if I hit the limit, you should probably show me the buffer (not just a warning that it's too late).

Versions 1.x.x of SnappyCam had a linear buffer [1] but I felt it was distracting. I generally can see the "end" of the circular buffer around the shutter button, so it doesn't seem to be an issue for me. Perhaps I tend to touch it on the lower-right instead of dead-center. I made an effort to support lefties in the UI (see Advanced Settings), but the buffer doesn't spin the other way just yet. (To be honest, I've ha…

Nice crotch shot jpap :-)

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#193

Post by lukego »

jpap wrote: post #153
prawn wrote: post #148

Earlier quoted context omitted.

Congrats fellow Australian. Two of us here in an office in Adelaide just bought the app. Guy behind me said "Hey, this is pretty cool. Have you seen... oh, you're looking at it already."

Onya mate! That's bloody awesome. :D

Impressive stuff! And just in time to capture some action shots of my puppy :-) -Appreciative fellow Australian, in Switzerland :)

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#196

Post by svantana »

jpap wrote: post #16
revelation wrote: post #11

DCT is already lossy [1], so the statements around 8 megapixels are completely pointless, and worst of all, its 1990 lossy technology. Wavelet transformations completely destroy any DCT. That said, if their emphasis is on producing pictures with minimal time delta at highest resolution, algorithms used for still pictures are out of place. Video compression algorithms still use DCT and wavelets, but they do so only af…

You are right on the loss: it's purposefully introduced as a quantization step after performing the DCT, and before losslessly compressing the resulting coefficients with Huffman and encoding to the final JPEG bitstream. Despite all of that, JPEG has now become computationally tractable. I remember the days where it took tens of seconds to encode a JPEG on a commodity machine. Now, with the help of SIMD, we can encod…

SIMD, you say? Are you relying mainly on NEON optimizations or are you also doing encoding stuff on the GPU? Very impressive performance I must say!

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#197

Post by voltagex_ »

jpap wrote: post #141
voltagex_ wrote: post #136

jpap, if you ever find yourself stranded in Canberra, I'll buy you a beer (a proper Australian one).

Cheers mate, I'm from Melbourne and might just take you up on that! (I live here in SFO at the moment, but try to get back as much as I can.)

I'm over in the States in a month-ish but not over your way (Seattle, NYC).

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#198

Post by voltagex_ »

josh2600 wrote: post #161
jpap wrote: post #91

Earlier quoted context omitted.

Fair comments, and much appreciated. I did all of the graphics design myself, in the app and on the web. :-) The infinite sign you see does require an explanation. I'll take your advice and think about how it can be done more simply. It's basically telling you, the user, that the capture buffer has filled, and you're now dropping (some) shots.

Have you thought about displaying a semi-transparent bar to show the buffer? Or maybe a one or 2 px white mark creeping up the side of the screen (turning to red as it get towards the top)? Just some thoughts. If you have a buffer, and I'm gonna get fubarr'd if I hit the limit, you should probably show me the buffer (not just a warning that it's too late).

A red thing might look too much like a "Recording" dot, though.

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#199

Post by wluu »

jpap wrote: post #133
zxcdw wrote: post #128

Earlier quoted context omitted.

Out of curiosity, what kind of educational background do you have if you don't mind the question? As a highschool dropout it interests me. :)

I'm Aussie, so I did my schooling in Melbourne, Australia. I don't recommend the same path for everyone, but my ugrad at RMIT University, dual bachelors of EE and CS. I then went on to do a Ph.D at the University of Melbourne in EE. My dissertation was on mathematical optimization of wireless and wireline DSL. (Prof Jamie Evans is an awesome guy if you're on the lookout for an advisor!) I've been in SFO for just over…

high five

Another fellow Australian and Melburnian.

Well done on the app John!

Re: Scientific Breakthrough Lets SnappyCam App Take 20 Full-Res Photos Per Second

#200

Post by skrebbel »

nwh wrote: post #31

Looks like they've an instagram-type site set up too. http://snappyc.am/2LdRMF28U0 http://snappyc.am/4HHxyCad7D http://snappyc.am/3G3i6QCJUk

Just for your info, the top link actually crashed my Windows Phone 8's Internet Explorer. Clearly that's an IE bug and nothing else, but I thought you should know :-)

Keep up the good work!

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