From: Chris.C <chr...@nt...> - 2011-03-31 12:09:52
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Maybe to help my previous question along Say I use the Caspa VL and set it for 30fps VGA. >From the information in the data sheet I get Overall Pixel Rate = 3 x 752 x 480 x 30 = 35Mpixels/s (approx) and since its 10bits/pixel we get approx 350Mbits/s. Now say I want to transmit this wirelessly over the 802.11b/g wireless gumstix module. So I want to compress this to say 1Mbit/s to transmit it wirelessly. Can it be done? If so with which compression am I looking at using? Would it be possible to keep the output at something standard like 640 x 380 @ 30fps?? Chris.C wrote: > > Thanks for the helpful and speedy reply! However, what if I wanted to work > out the CPU usage from a hypothetical sense to prove that it will work > before having someone write code etc so I can compare on paper before > giving the go ahead? > > Thanks > Chris > > > vwyodapink wrote: >> >> http://linux.die.net/man/1/top >> >> Its a program you run. >> >> On Thu, Mar 31, 2011 at 12:40 AM, Chris.C >> <chr...@nt...>wrote: >> >>> >>> top?? >>> >>> >>> vwyodapink wrote: >>> > >>> > top would give you a close idea to your usage. >>> > >>> > >>> > >>> > On Wed, Mar 30, 2011 at 8:03 PM, Chris.C <chr...@nt...> >>> > wrote: >>> > >>> >> >>> >> Yes I have seen Pixhawk and in some way I want to emulate it, but my >>> >> original >>> >> plan was never to use this kind of camera system as any that Pixhawk >>> used >>> >> were third party. But now that Gumstix has its own product I would >>> look >>> >> into >>> >> using it. So the Overo Air was suitable for what I had, but obviously >>> now >>> >> its seeming that it won't quite be enough. >>> >> >>> >> But can I ask, as with Steve how do you know you are maxing out at >>> 65% >>> >> CPU >>> >> usage? I would be interested to see how you concluded that number. >>> >> >>> >> Thanks >>> >> Chris >>> >> >>> >> vwyodapink wrote: >>> >> > >>> >> > oh and paparazzi uses overo's in the LisaL setup I believe its >>> called. >>> >> > >>> >> > >>> >> > >>> >> > On Wed, Mar 30, 2011 at 7:17 PM, J. L. <vwy...@gm...> >>> wrote: >>> >> > >>> >> >> If this is for a UAV you should check out the pixhawk site and >>> they >>> >> give >>> >> >> good ideas on what you can do with the overo's. I use an overo >>> fire >>> on >>> >> my >>> >> >> UAV though dont use the caspa, but do video and many other things >>> and >>> >> max >>> >> >> out roughly around 65% CPU usage clocked at 720. If you use DSP >>> your >>> >> >> usage >>> >> >> drops drastically. >>> >> >> >>> >> >> >>> >> >> >>> >> >> >>> >> >> On Wed, Mar 30, 2011 at 6:49 PM, Chris.C >>> >> >> <chr...@nt...>wrote: >>> >> >> >>> >> >>> >>> >> >>> So it would be possible if its all it was to be used for, but is >>> >> going >>> >> >>> to >>> >> >>> cause issues if I look to do more with the board. Can I ask how >>> you >>> >> >>> arrived >>> >> >>> at the 70% and %20? >>> >> >>> >>> >> >>> Thanks for the massive help already. >>> >> >>> Chris >>> >> >>> >>> >> >>> Steven-132 wrote: >>> >> >>> > >>> >> >>> > DSP allow you to do h264 compression without killing your CPU. >>> >> You're >>> >> >>> > looking at 70% CPU usage for 320x240@30fps MJPG compression >>> without >>> >> >>> DSP >>> >> >>> vs >>> >> >>> > 20% CPU usage for 640x480@30fps h264 compression. >>> >> >>> > >>> >> >>> > On Wed, Mar 30, 2011 at 11:23 AM, Chris.C >>> >> >>> > <chr...@nt...>wrote: >>> >> >>> > >>> >> >>> >> >>> >> >>> >> I have been looking into using the Caspa VL with the Gumstix >>> Overo >>> >> >>> Air >>> >> >>> >> COM, >>> >> >>> >> however I'm having some doubts. The overall final design would >>> go >>> >> >>> onto >>> >> >>> a >>> >> >>> >> UAV >>> >> >>> >> so I need the wireless capability of either the Overo Air or >>> one >>> >> of >>> >> >>> the >>> >> >>> >> Overo Fire boards. >>> >> >>> >> >>> >> >>> >> The Overo Air comes with the OMAP 3503 which only comes with >>> the >>> >> ISP >>> >> >>> >> interface. This would allow me to get the image from the >>> camera >>> >> and >>> >> >>> >> potentially transmit it wirelessly to the ground. Correct? >>> >> >>> >> >>> >> >>> >> However, the Overo Fire comes with the OMAP 3530 which has the >>> ISP >>> >> >>> >> interface >>> >> >>> >> (with what seems a few more features) and a DSP. And again I >>> >> assume >>> >> I >>> >> >>> >> could >>> >> >>> >> get the image and transmit it wirelessly. >>> >> >>> >> >>> >> >>> >> Camera systems really aren't my strong point, so I'm just >>> >> wondering >>> >> >>> what >>> >> >>> >> I >>> >> >>> >> lose or gain by sticking with the Overo Air or do I have no >>> choice >>> >> >>> but >>> >> >>> to >>> >> >>> >> use the Overo Fire as DSP is a must? Why is DSP so important >>> if >>> >> the >>> >> >>> Caspa >>> >> >>> >> camera is listed as compatible with the Overo Air? >>> >> >>> >> >>> >> >>> >> Thanks in advance for any replies and ideas. >>> >> >>> >> Chris >>> >> >>> >> -- >>> >> >>> >> View this message in context: >>> >> >>> >> >>> >> >>> >>> >> >>> http://old.nabble.com/Caspa-VL-and-Overo-Air-COM-tp31278377p31278377.html >>> >> >>> >> Sent from the Gumstix mailing list archive at Nabble.com. >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >> >>> >>> >> >>> ------------------------------------------------------------------------------ >>> >> >>> >> Create and publish websites with WebMatrix >>> >> >>> >> Use the most popular FREE web apps or write code yourself; >>> >> >>> >> WebMatrix provides all the features you need to develop and >>> >> >>> >> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> >> >>> >> _______________________________________________ >>> >> >>> >> gumstix-users mailing list >>> >> >>> >> gum...@li... >>> >> >>> >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >>> >> >>> >> >>> > >>> >> >>> > >>> >> >>> >>> >> >>> ------------------------------------------------------------------------------ >>> >> >>> > Create and publish websites with WebMatrix >>> >> >>> > Use the most popular FREE web apps or write code yourself; >>> >> >>> > WebMatrix provides all the features you need to develop and >>> >> >>> > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> >> >>> > >>> >> >>> > _______________________________________________ >>> >> >>> > gumstix-users mailing list >>> >> >>> > gum...@li... >>> >> >>> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >>> > >>> >> >>> > >>> >> >>> >>> >> >>> -- >>> >> >>> View this message in context: >>> >> >>> >>> >> >>> http://old.nabble.com/Caspa-VL-and-Overo-Air-COM-tp31278377p31282672.html >>> >> >>> Sent from the Gumstix mailing list archive at Nabble.com. >>> >> >>> >>> >> >>> >>> >> >>> >>> >> >>> >>> >> >>> ------------------------------------------------------------------------------ >>> >> >>> Create and publish websites with WebMatrix >>> >> >>> Use the most popular FREE web apps or write code yourself; >>> >> >>> WebMatrix provides all the features you need to develop and >>> >> >>> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> >> >>> _______________________________________________ >>> >> >>> gumstix-users mailing list >>> >> >>> gum...@li... >>> >> >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >>> >>> >> >> >>> >> >> >>> >> > >>> >> > >>> >> >>> ------------------------------------------------------------------------------ >>> >> > Create and publish websites with WebMatrix >>> >> > Use the most popular FREE web apps or write code yourself; >>> >> > WebMatrix provides all the features you need to develop and >>> >> > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> >> > >>> >> > _______________________________________________ >>> >> > gumstix-users mailing list >>> >> > gum...@li... >>> >> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> > >>> >> > >>> >> > ----- >>> >> > Just a beginner trying to learn his way around. >>> >> > >>> >> >>> >> -- >>> >> View this message in context: >>> >> >>> http://old.nabble.com/Caspa-VL-and-Overo-Air-COM-tp31278377p31282916.html >>> >> Sent from the Gumstix mailing list archive at Nabble.com. >>> >> >>> >> >>> >> >>> >> >>> ------------------------------------------------------------------------------ >>> >> Create and publish websites with WebMatrix >>> >> Use the most popular FREE web apps or write code yourself; >>> >> WebMatrix provides all the features you need to develop and >>> >> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> >> _______________________________________________ >>> >> gumstix-users mailing list >>> >> gum...@li... >>> >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >>> > >>> > >>> ------------------------------------------------------------------------------ >>> > Create and publish websites with WebMatrix >>> > Use the most popular FREE web apps or write code yourself; >>> > WebMatrix provides all the features you need to develop and >>> > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> > >>> > _______________________________________________ >>> > gumstix-users mailing list >>> > gum...@li... >>> > https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> > >>> > >>> > ----- >>> > Just a beginner trying to learn his way around. >>> > >>> >>> -- >>> View this message in context: >>> http://old.nabble.com/Caspa-VL-and-Overo-Air-COM-tp31278377p31283929.html >>> Sent from the Gumstix mailing list archive at Nabble.com. >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Create and publish websites with WebMatrix >>> Use the most popular FREE web apps or write code yourself; >>> WebMatrix provides all the features you need to develop and >>> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >>> _______________________________________________ >>> gumstix-users mailing list >>> gum...@li... >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >> >> ------------------------------------------------------------------------------ >> Create and publish websites with WebMatrix >> Use the most popular FREE web apps or write code yourself; >> WebMatrix provides all the features you need to develop and >> publish your website. http://p.sf.net/sfu/ms-webmatrix-sf >> >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> ----- >> Just a beginner trying to learn his way around. >> > > -- View this message in context: http://old.nabble.com/Caspa-VL-and-Overo-Air-COM-tp31278377p31285753.html Sent from the Gumstix mailing list archive at Nabble.com. |