can i make video overlay (text ) using a pic ?

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max_imum2000 said:
and how difficult it is ?, i have no idea about video signal
Click to expand...

Graphics or just text? TExt is apparently pretty easy. You can even buy things out there for $100 to do it. FOr graphics (like lines and circles and rectangles) it seems much MUCH harder. Like the systems that are out there start costing $3k+ or you start needing to get FPGA IP cores that cost $4k and the FPGA (as well as a PCB that can support it, not to mention soldering or paying to have it soldered on) which costs $2k+.

EDIT: Oops, I see you did specify text. I am not sure what you mean exactly by "using a PIC" whether you mean use a PIC to do the overlay itself, or use the PIC to control a OSD module to do the overlay. I don't know how to do it directly from a PIC since you have to understand the video signal and sample it and generate a new video signal and everything. To use a module is quite easy...you just hook up the module and use the PIC to tell the module what you want on the screen.

**broken link removed**
 
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PIC 16F84 Microcontroller VGA interface

PIC 16F84 Microcontroller VGA interface

his scheme, designed by Eric Schlaepfer, wide spreads in the Internet. Unfortunately, at it there is an error in distributing of the pins of the controller, and the program, enclosed it, is intended for a CGA/MDA of monitors and with VGA DOES NOT WORK. A nice joke ;-))) I offer the fitted scheme and program adapted for VGA of a mode 640x480 60Hz.
 
Thanks for all your reply

please take a look at this simple and cheap circuit , but it uses a atmega and the code is assemble already, and i really cant figure its theory of operation ,
maybe someone can explain more

**broken link removed**
 
text overlay on video

hello
can anybody tell me that text overlaying on video(vga 640x480) is possible using microcontroller or not?
 
hello
sir i have seen your recommendation, but i m confused as where i m getting input VGA.
thanks
 
this is what you want: MAX7456

**broken link removed**

$20 each but you can surely get a couple of free samples from them.
 
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That MAXIM part is for TV broadcast PAL/NTSC. Not VGA. Video Graphics array does not have the same refresh rate nor is it interlaced nor does it use the same colorburst freq.
 
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No one said it was VGA the OP asked:

can i make video overlay (text ) using a pic ?

and how difficult it is ?, i have no idea about video signal
Click to expand...

nasir16 asked for VGA.... Even the **broken link removed**the OP posted is for NTSC/PAL type video and not VGA "Mosaic"...

OP = Original Poster
 
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Your response appeared immediately after the request for VGA capability. Just pointing out that the response was not a VGA response but a broadcast TV response.
 
but who said my response was to that VGA guy? If i reply to something its intended for the OP so... anyway. With that IC i stated he can do that so easy! with less memory and less headache if it was from scratch.

RMMM: Those are some good links... good find!
 
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yes it is..
but it is vga to TV converter
i have to input from vga port process video and then output it via vga port.
 
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