180° twisted picture on VGA

Started by Washwillah, Aug 27, 2006, 16:03

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Washwillah

Hello!
I have a dvd player with a VGA output. i want to twist a picture with 180° but the dvd player is unable to this. could i do this with the vga connector?  :?:  
thx

mimposs

Shortly: no.

If you want to have a picture

+====+
+A==B+
+====+
+C==D+
+====+

turned into

+====+
+D==C+
+====+
+A==B+
+====+

you'd need to store each frame line somewhere untill the picture has fully sent, then start reading each scan line in the inverse order (from the bottom up), sending to the monitor each one in the inverse direction (from right to left).

It looks to me, this in not something you can do just playing with cables. It takes some (fast) electronic, a real framebuffer, plus some simple logic, plus the ability to have this electronic synch with the various VGA frequencies.

mimposs

Sorry :P , the idea was:

If you want to have a picture

+====+
+A==B+
+====+
+C==D+
+====+

turned into

+====+
+D==C+
+====+
+B==A+
+====+

Washwillah

wow, thanx. it is too difficult for me :)
i have another question: can i transform an s-video or composite output to vga?

Kenny

With my uC's and programming, yes, else, no.
It need to be decoded into component/rgb, and then use a pute composite output as sync... it is quite difficult...

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