Viewing LPBYTE variable as an Image

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In my feild training i've come across LPBYTE variable that is streamed to me as frames
I want to find a way to view these frames on my pc
since i don't have a lot of experiance, i'm kinda stuck there :(

the LPBYTE arrives to me as unrecognized symbols, like:

،¤¤¤££££££££££¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¥¥¥¥¥¥¥¥¥¥¥¥¥¥¦¦¦§§§§§§§§§§§§§§§¦¦¦¦¦¦¦§§§§¨¨¨©©©ھھھھھھھھھھھ©©¨¨©©¨©©©©©©©©©©©©©ھھھ«««««««««««ھھ««ھ««««¬¬¬¬¬¬¬¬¬¬¬ھھ©©©©§§§¦¥¥¦¦¨©ھ««¬¬¬¬¬¬¬¬¬¬©›„fccccXuv\”¬«ھ«ھھھ««¬¬¬¬®®®®®®®®®®®®®®®®®®®¯°°°°¯®®®®®®®®®®®®®®®®¯°¯¯®®¬®®¬¬¬¬¬¬¬¬¬¬«««««ھھ««ھ««««¬¬ھ©¨‹¦‚ں

and when saving it as (.JPEG or .bmp) it wont open,
so, I was thinking that it may be raw pixel data, but still can't find a way to view it

can any one help me to view these frames on my pc ?

Posted 24-Jun-13 22:04pm

Mesa1993

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Richard MacCutchan 25-Jun-13 4:43am

You need to go to the person or device that is sending the data and find out what format it is in.

Mesa1993 25-Jun-13 5:06am

That's the problem i can't reach the device
but idk if this helps the program is streaming the video on my iPhone
so I'm running the software's SDK on my pc to convert it from a mobile appliction to a desktop aplication

enhzflep 25-Jun-13 5:21am

Nah, that's for paid-work or wimps. :-p

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enhzflep · Accepted Answer · 2013-06-24T22:53:00

Got any of the _important_ details?
I.e
■ How many bytes are in each frame?
■ What is the expected bit-depth of the images?
■ What's the resolution?

Anyway, Try working with a small section of the image - perhaps 5 or 10 pixels.
1) Save the received data to a binary file
2) Open the file with a hex editor and write down 15->20 or 30->40 of the bytes (I.e 3 or 4 bytes for 5 pixels, or 3 or 4 bytes for 10 pixels)
3) Open your favourite image editing program and start entering the data.

I.e if the first 6 bytes are FF 000 00 FF 00 00, then you may try working with an assumption that the image is 24 bits. You could then say that the colour values for 2 pixels are (255,0,0) and (255,0,0) - use windows calculator in programmer mode if you're not familiar with hexidecimal numbers.

After several pixels - perhaps 5 or 10, you may be able to recognize the data as an image.
Also note, I've assumed that the data is stored as RR GG BB RR GG BB etc. You may also wish to try BB GG RR BB GG RR.

Finally, depending on your device, it may not even be rgb data - even if it is raw, uncompressed video frames. It wouldn't surprise me if the data came out in the YUV format - one that draws roots from analog tv signals. Data that would need conversion to either of the rgb or hsl colour models. Though, YUV would make my next suggestion less useful.

A good approach may also be to print the data as ascii characters, ensuring that the number of chars per line is the same as the number of expected pixels per row. Although it wont really reveal the picture, it can be a fast way of visually recognising a pattern. It would also be helpful if the data was only 8 bit. You wouldn't have the palette, but you could see the image.

As you can see, there are lots of potential pitfalls and things that may thwart your efforts.
Good luck!