Looking For A Frame Grabber Which Can Store Frames As YCrCb Data Files

[Mic_Scale]

Hello Guys,

I am looking for a Frame Grabber which supports a variety of video signals:

Standard Definition Analog (NTSC, PAL, etc.) Composite and Component.

Standard Definition Digital (Serial Data Input).

High Definition Analog.

High Definition Digital.

And which can output YCrCb data files, before they are further processed, converted or compressed to other graphic files.

I need this YCrCb data files for inputing another image processing device, so it's very important that the grabber will be able to do this, besides saving the captured data as a bitmap or jpeg.

Thanks,

Michael.

[Eric_R]

Hi Michael,

Unfortunately, none of our frame grabbers are able to natively perform the tasks you requested. To perform these operations you will need to look into purchasing one of our VideoMASTER- complete video test systems.  This system can run a wide array of different video standards and can analyze both digital and analogue tasks. I have linked below where you can find additional details about this PXI system. Let me know if you have any further questions.

Testing Analog and Digital Video with LabVIEW and PXI

http://zone.ni.com/devzone/cda/pub/p/id/239

Using National Instruments for Efficient Digital Video Test

http://zone.ni.com/devzone/cda/tut/p/id/6967

Thank You,

Eric Reid

Applications Engineer

[Mic_Scale]

Hi Eric,

A. Well, the most important feature that we would require is the ability to save the frame as a file which contains YCrCb data, which is also sometimes refered to as YUV, or CCIR 601.

B. Now the capturing in a YCrCb data format is needed for only 2 types of digital signals. What I mean is that I need only to capture a Standard Definition Video Signal, coming out from an external Serial Data Interface, and a High Definition video signal, coming from an external Serial Data Interface.

Analog signals support is only a "nice to have" option at this point.

C. There is no problem if I would be required to purchase  2 frame grabbers, one which supports storing Standard Definition Digital Signals and another for High Standard. It doesn't have to come in one device.

 

D. Also, can anyone explain a bit on what type of files are used for storing YCrCb information ? ( Their structure, common extensions, ect.).  My knowledge is not vast in this area.

Appreciate the help,

Michael.

[Eric_R]

A. Well, the most important feature that we would require is the ability to save the frame as a file which contains YCrCb data, which is also sometimes refered to as YUV, or CCIR 601.

None of our frame grabbers can save a file as YUV data. You can however save as a RGB file and convert via matrices to Y’UV. The following operation will perform this transformation.

 

For more information on this refer to the Wikipedia source on Y’UV matrices transformations (http://en.wikipedia.org/wiki/YUV). The NI PCI 1405 can do CCIR input (http://sine.ni.com/nips/cds/view/p/lang/en/nid/14209).

B. Now the capturing in a YCrCb data format is needed for only 2 types of digital signals. What I mean is that I need only to capture a Standard Definition Video Signal, coming out from an external Serial Data Interface, and a High Definition video signal, coming from an external Serial Data Interface.

Analog signals support is only a "nice to have" option at this point.

Can you explain this process a little bit more? Our cards can do Standard definition but not High Definition video signals. If this is just serial information perhaps another card could be used.

C. There is no problem if I would be required to purchase  2 frame grabbers, one which supports storing Standard Definition Digital Signals and another for High Standard. It doesn't have to come in one device.

To intake a digital signal you will need to look into one of our high speed digitizers. There are no frame grabbers that support Standard and an High Standard digital signals.

D. Also, can anyone explain a bit on what type of files are used for storing YCrCb information ? ( Their structure, common extensions, ect.).  My knowledge is not vast in this area.

 I am unaware of any way to save YCrCb information other than converting to an array with RGB components.

I hope that helps Michael, let me know if you have any further questions.

Thank You,

Eric Reid

[Mic_Scale]

Hi Eric, thanks

Using a digitizer is indeed an interesting option.... very much so.

And now, another question if I may...

I've read somewhere that MPEG2 format is a stream of YCbCr data inside.
Suppose I would like to extract this data, at least a couple of lines of a frame, in Labview.
How do I get started ? Where can I get help with it ?

Regards,

Michael.

[Eric_R]

Hi Mike,


I don't know of a way in labVIEW to natively take in a MPEG2 file and extract frames from it. You could however convert the MPEG data into an uncompressed AVI and then read that in as IMAQ frames into labVIEW. I also noticed a similar discussion to this in the labVIEW forums discussing the creating of mpeg's http://forums.ni.com/ni/board/message?board.id=170&message.id=202758&requireLogin=False.



Thank You,
Eric Reid

[aman_bajra]

Hi Mike,

Could you find any way to grab the frame . Would be great if you could post it.  I am trying to develop a simillar program  .

Thanks

[sankar06]

Hai 

any one know how to display ycbcr image in labview

[Simon-P]

Greetings, Sankar;

You might want to post this question under a new thread - it will give it much more visibility.

However, I am not aware how we would go about displaying a YCbCr image in LabVIEW without first making the image into RGB or some such. An example of using YCbCr in LabVIEW might be found in the following link:

http://digital.ni.com/public.nsf/allkb/B692D952063765418625795D00662A31?OpenDocument

Simon P.