How to display JPGs on TV set ?

[ayeong]

Display JPGs on T.V

Hi,

Anybody got any idea on how to display pictures taken by digital camera (JPEG) to be displayed on the T.V ?

Anybody got any previous project (schematic), reference ebook or link to share ?

Thanks

 

[davorin]

Re: Display JPGs on T.V

How to you get pictures from camera to this new jpegtv device? (o;

Easiest way (o; Burn CD and put into dvd player...

No...seriously...some mpeg2 decoders are able to display jpeg as well...though expensive solution and probably you don't get any of those chips (at least I didn't ;o).

Another might be to use an FPGA to do the video timing/encoding/dac feeding. Maybe JPEG decompression as well...

Can you tell more about how your hardware should be?

- Single PCB with CF slot and CVBS output?
- Networked?

 

[ayeong]

Re: Display JPGs on T.V

Basically, I have CF card with JPEGs in it.

If I were to use a video encoder which accept CCIR-601 format to display NTSC/PAL (e.g. from Analog Devices), how am I suppose to convert those JPEGs to CCIR-601 format ?

And can a 8bit microcontroller in between a CF card and video encoder fast enough to do the job ?

Thanks

 

[davorin]

Re: Display JPGs on T.V

There are lot of source codes around for jpeg compression/decompression...search either sourceforge or freshmeat...

I don't think your 8 bit controller would be fast enough to feed the video encoder...would suggest some cpld/fpga glue logic to do the timing/buffer readout...

What about another digital camera? (o;

My Ixus 400 has built-in cvbs output (o;

 

[ayeong]

Re: Display JPGs on T.V

Hi Davorin,

I still could not find any link or information about converting from JPGs to CCIR-601 digital format.

Could you share with me on those information ?

Information such as what kind of alogrithm need to be applied to the JPG, file information (headers & etc).

Thanks

 

[davorin]

Re: Display JPGs on T.V

There is no direct jpeg-to-ccir-601 conversion...Since jpeg is still image and ccir-601 varies over time (o;

You need to decompress jpeg to YUV components (guess this is what most video encoders use). Look for jpeg2yuv sources...part of mjpeg tools. If you´re able to compile and run it on your target CPU you´re half way there (o;

Then you feed the YUV image to the video encoder...so you need an image RAM which is read by the encoder continously...

 

[Jayson]

Re: Display JPGs on T.V

How does one implement the continous reading of image information from RAM with the ability to update the RAM anytime for a new image? Are there any reference design circuits for this type of memory architecture?

- Jayson

 

[davorin]

Re: Display JPGs on T.V

Look at some RAM controller implementation in CPLD/FPGA or VGA controller designs...

You might want to checkout opencores.org for this...

 

[socketz]

Re: Display JPGs on T.V

What you want already exists as a consumer device.
Check:
http://www.compgeeks.com/details.asp?invtid=MPM