On Friday, September 26, 2014 15:11:29 liyaoshi wrote: > If I understand correctly > It should like surround view or adas ? > and as I know , AM335X don't have isp . while omap3 have it . > while cvbs signal in . camera module will turn to bt656 or what ever > digital signal , as usually BT656 > > And when you can catch BT656 digital signal . you can program it to > overlay or something . > > And about the CVBS out signal . You can NOT generate it by GPIO .
You can generate it just fine with the BeagleBone Black's GPIO. I have done composite output with the option to overlay a video stream with the PRUs. (sorry no photos or write ups yet; running way behind on that.) The hardware is pretty trival for mono. You need to switch between 3 basic voltages with enough drive for 75ohm's and have the right termination: - Sync voltage - Black level - White level Color is a little trickier in that you need to get the phasing right or the color shifts around. Think of it as using the BBB as a programmable arbitrary wave form generator. At 200MHz on the PRU, that's plenty fast for a signal that lives with less then 6MHz of bandwidth. As for input, the PRUs should be able to handle it; slap on a analog video to BT656 converter chip. Doing either capture or video output is easy. Doing both requires scheduling the PRUs so they don't block when access is made outside of the PRUSS. > For Your application .As I think , You should use OMAP3 BB-XM board with > omap3 soc > > It will have a isp and cvbs out,only problem is it will only have 1 isp > > if you want to get another work with usb . > > 2014-09-26 4:32 GMT+08:00 <pcfear...@gmail.com>: > > Hi all > > > > I and a couple guys are trying to build a system from the BeagleBone Black > > that uses an IR and color camera for quadcopter video. > > We have one of each of these cameras > > > > http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/LightImaging/32KM_s > > pec.docx.pdf > > > > http://pub.ucpros.com/download/ov7620_ov7120_v1.2whole.pdf?osCsid=g3j4cfse > > ca1627jv9mc4lans75 http://www.drs.com/products/rsta/PDF/Tamarisk.pdf > > The end goal is to be able to output a video stream of either (1) the > > color camera (2) the IR camera (3) a composite video - b/w or color, > > overlay or other. It has to be composite video for the quadcopter. (it's > > a > > system already setup and we're just doing add-on) > > Known problems: > > The BeagleBone Black only has one USB port. I can probably figure out how > > to make the IR camera recognizable by the system through the USB port, but > > the other two are a bit more complicated -- one is purerly analog NTSC and > > the other has a variety of digital options and a monochrome NTSC > > backup/test output. Maybe there's a way to configure the GPIOs to handle > > this? > > I'm planning on using OpenCV for the overlay/processing, though I'm not > > very familiar with it. > > > > Sound crazy? It is, but that's what we're doing... > > > > -- > > For more options, visit http://beagleboard.org/discuss > > --- > > You received this message because you are subscribed to the Google Groups > > "BeagleBoard" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to beagleboard+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
