Inverted Video

Started by Anonymous in comp.dsp13 years ago 15 replies

"Simon S Aysdie" wrote > Why is video inverted for transmission? So that the peaks of sync pulses are transmitted at +100%...

"Simon S Aysdie" wrote > Why is video inverted for transmission? So that the peaks of sync pulses are transmitted at +100% modulation, which allows TV receivers to show the most stable picture in the presence of noise (eg, fringes of the coverage area of the TV station). RF RCA Broadcast Field Engineer, retired


Questions about equivalents of audio/video and digital/analog.

Started by Radium in comp.dsp13 years ago 290 replies

Hi: I=2E Audio vs. Video Digitized (mono) audio has a single sample per each sampling interval. In the case of digital video, we could...

Hi: I=2E Audio vs. Video Digitized (mono) audio has a single sample per each sampling interval. In the case of digital video, we could treat each individual sample point location in the sampling grid (each pixel position in a frame) the same way as if it was a sample from an individual (mono) audio signal that continues on the same position in the next frame. For example, a 640=D7480...


Testing video sequences for a quality assessment metric?

Started by VijaKhara in comp.dsp11 years ago

Hi all, I am developing a video quality assessment metric. I need a testing video database containing ``psychophysic-based graded''...

Hi all, I am developing a video quality assessment metric. I need a testing video database containing ``psychophysic-based graded'' sequences. Here, I use the term ``psychophysic-based graded'' sequences to refer to the videos that have been graded using some psychophysical experiments, not some kinds of assessment metrics such as PSNR, SSIM, etc. The objective is to check how much my metri...


Video:Text overlay

Started by NP in comp.dsp13 years ago

Hello, I am trying to implement Text overlay on blackfin processor. But I dont have any approch about the implementation for the same....

Hello, I am trying to implement Text overlay on blackfin processor. But I dont have any approch about the implementation for the same. How text should be display on live video. If any one have the document or any code for the same then kindly forward to me at naresh850 at gmail.com. Regards, NP


Need recommendation: nonlinear video-frame warping

Started by axlq in comp.dsp12 years ago 4 replies

I'm sure this is a solved problem, but I don't know where to start looking. I have expertise in software and electronics, but DSP isn't my...

I'm sure this is a solved problem, but I don't know where to start looking. I have expertise in software and electronics, but DSP isn't my field of expertise, so I don't know what hardware is out there that will do the job I need. I am putting an R&D proposal together for my company, and one component of it involves real-time nonlinear transforms of a video signal. The transform, in re...


Blackfin BF561 DSP and realtime JPEG SD video encoding

Started by Anonymous in comp.dsp8 years ago 5 replies

So, I've been looking at a few ways of creating a module that does "video-i= n" -> "convert to stream of individual JPEG images" -> "send over...

So, I've been looking at a few ways of creating a module that does "video-i= n" -> "convert to stream of individual JPEG images" -> "send over a network= ". One way might be to use a Blackfin DSP. I'm having some difficulty trying to figure out whether the DSP would be up= to the job though. On the ADI site, they seem to be quoting ~31 cycles/pix= el (http://www.analog.com/en/processors-ds


Video on tuning PID controllers

Started by Tim Wescott in comp.dsp4 years ago

Yet another video on tuning PID controllers has been tossed into the YouTube pool. ? https://youtu.be/drYO60z6_h4 -- Tim...

Yet another video on tuning PID controllers has been tossed into the YouTube pool. ? https://youtu.be/drYO60z6_h4 -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!


MPEG mistake

Started by glen herrmannsfeldt in comp.dsp9 years ago 3 replies

While posting to the DCT vs. FFT discussion, I was reminded of some thoughts related to MPEG and video compression. It seems to me that one...

While posting to the DCT vs. FFT discussion, I was reminded of some thoughts related to MPEG and video compression. It seems to me that one case that MPEG doesn't do well is rapid changes in overall illumination. Specifically, the case where many flash photographs are being taken in a short time. That causes little problem with analog video, where frames are independent of each other. ...


AGC for media (video) player software

Started by dv_ in comp.dsp7 years ago 4 replies

Hello, AGCs have been discussed here several times. However, there is one aspect I haven't seen mentioned here so far. There are many videos...

Hello, AGCs have been discussed here several times. However, there is one aspect I haven't seen mentioned here so far. There are many videos with a rather low sound level (especially VCR captures often have a very silent audio track). Also, it is unfortunately quite common that a video stream contains rather silent main content, interrupted by very loud ads. A replaygain prepass over videos ...


EVMDM642 problem in running examples

Started by arichard in comp.dsp14 years ago 1 reply

Dear Experts, I need your help in order to detect what i am possibly doing wrong. I try to run the examples that came with the board (just...

Dear Experts, I need your help in order to detect what i am possibly doing wrong. I try to run the examples that came with the board (just as it came), especially the video and video networking examples and the result is always the same: at the beginning the screen shows a color bar, and then when I try to run any of the examples the screen just becomes pink/grey. I am trying to run the e...


FFT of a video? (Caterpillars involved!)

Started by Alex Vaughan in comp.dsp15 years ago 1 reply

Hi, I'm trying to track the periodic movements of a caterpillar; in one behavior, it compresses its entire body regularly (period: 4s), and...

Hi, I'm trying to track the periodic movements of a caterpillar; in one behavior, it compresses its entire body regularly (period: 4s), and in another it has a peristaltic wave of compression that moves from tail to head (period:20 sec). I'd like to observe this by taking video, and doing a frequency analysis across time; the caterpillar itself doesn't move (much), so we're only looking...


How to do Chroma Decimation

Started by Anonymous in comp.dsp15 years ago 3 replies

Hi, I am a university student working on a real-time video conferencing project. I'm trying to find a compression solution that will be...

Hi, I am a university student working on a real-time video conferencing project. I'm trying to find a compression solution that will be quick enough to give me the throughput I need, but will also give me the compression ratio I need. Each of my video frames are 320x240 pixels and each pixel has 3 bytes associated with it (R,G,B). For further information, see a post that I made to comp....


Need 5 Frames of Interlaced Video

Started by Jeremy Smith in comp.dsp17 years ago 1 reply

Hi. Can anyone please point me at some public Web site that has a data file containing about 5 frames (i.e. 10 fields) of an interlaced video...

Hi. Can anyone please point me at some public Web site that has a data file containing about 5 frames (i.e. 10 fields) of an interlaced video sequence pulled from an NTSC television broadcast? I need this data for my research. Please respond by posting to the group. The e-mail address in the header does not work. Thanks.


Building the pendulum demonstrator

Started by Tim Wescott in comp.dsp4 years ago 8 replies

I show how I built the demonstrator for my systems & stability video. It's an electromechanical pendulum, and it's kewl -- or it was, until I...

I show how I built the demonstrator for my systems & stability video. It's an electromechanical pendulum, and it's kewl -- or it was, until I broke it making this video. https://youtu.be/YW33PVTYhdw -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!


OT: Undersampled Humming Bird Video.

Started by Symon in comp.dsp16 years ago 3 replies

Hi All, If anyone's interested, I captured a video yesterday of a humming bird on our feeder outside our apartment in Los Gatos, CA. I'm quite...

Hi All, If anyone's interested, I captured a video yesterday of a humming bird on our feeder outside our apartment in Los Gatos, CA. I'm quite pleased with it! You can download it from http://home.comcast.net/~symon_brewer/Motion_16.avi . It's a 15 Mbyte AVI file, so only for those with broadband or a lot of patience. It plays in Windows Media player, but I recommend downloading it by r...


using MCBSP and MCASP

Started by devi in comp.dsp14 years ago

hi, I'm trying to interface audio codec and SDcard with DSP[DM642]... SDcard is connected with MCBSP port and audio codec is connected...

hi, I'm trying to interface audio codec and SDcard with DSP[DM642]... SDcard is connected with MCBSP port and audio codec is connected with MCASP0.... I'm also using Video port 1 and video port 2.. In the datasheet, it is given that MCASP0's control is in videoport 0 and data is in videoport 1... My doubt is i'm using videoport 1 for video in interfacing... If i connect the MCASP...


Component Video (Low Res) conversion to RGB BITMAP possible using dsPIC?

Started by amr in comp.dsp11 years ago

My project basically involves being able to take screenshots from a medium-res component video signal (not HD.) Is a dsPIC capable of doing...

My project basically involves being able to take screenshots from a medium-res component video signal (not HD.) Is a dsPIC capable of doing that? In general, I'm trying to get a feel for the kind of horse power needed to do this task. I tried to find the Component specification to figure out what frequencies it runs at and so on, but I had no luck with that.


Concurrent processes on the DM642?

Started by Anonymous in comp.dsp12 years ago 1 reply

I've been looking at similar sourcecode to some of the stuff I'm trying to do on the DM642 (video in -> process - > out) and noticed that in...

I've been looking at similar sourcecode to some of the stuff I'm trying to do on the DM642 (video in -> process - > out) and noticed that in some functions there seems to be some kind of concurrent processes - ie code within a 'while(1){...' loop that only captures video. How does this kinda thing work? How does it communicate status to the calling function? I assume this makes for a much qu


DSP with on-chip video in & Ethernet ?

Started by Robert Lacoste in comp.dsp14 years ago

Hi guys, Any recommandation for a DSP well suited for an "IP-connected intelligent cameras" project, with the following key characteristics...

Hi guys, Any recommandation for a DSP well suited for an "IP-connected intelligent cameras" project, with the following key characteristics : - On-chip video in port - Quite high horsepower (in the 1000Mips range) - Able to drive a quite large external Ram (32Mo) - Ethernet 100BT interface I have already Blackfin and TI's TMS320DM64x in mind, but any advice or alternative choice will be ...


Re: Linear PCM DVD 400 Nm Fastasy

Started by Radium in comp.dsp13 years ago

On Feb 2, 11:56 am, Lostgallifreyan wrote: > Can I? Can I really? Isn't life rewarding, at times? Reposted to include: comp.dsp,...

On Feb 2, 11:56 am, Lostgallifreyan wrote: > Can I? Can I really? Isn't life rewarding, at times? Reposted to include: comp.dsp, alt.lasers, sci.optics, rec.video.dvd.tech, alt.video.dvd.tech [f--king google does not automatically send replies newsgroups included in the headers] F--k google. Hope they suffer like s--t How funny, you opened up a thread that started mo