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Forum: FPGA, VHDL & Verilog Robert and Prewitt Edge Detection


Author: Mark Jomari (imaroj)
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good day sir/maam!,
is this normal that there are ranges of threshold value of roberts and 
prewitt edge detection that makes the image moving(image is not stable) 
in the vga monitor?
thank you,.

Author: Lothar Miller (lkmiller) (Moderator)
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Provide more information!
What is your problem?
What components are involved on what platform with what development 
system? What is moving how fast?

Author: MaWin (Guest)
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Mark Jomari wrote:
> that makes the image moving

If you repeatedly use the operator on its outcome ?

Author: Mark Jomari (imaroj)
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sorry for a very broad question,,,  im done doing a prewitt and robert 
edge detection in an fpga,, the input is a camera and the output is vga 
monitor.. its working perfectly,, im just curious,, why there are ranges 
of threshold value that makes the display moving, but if set the 
threshold value above that threshold, it works perfectly,. im just 
curious, if this is normal>? that some value makes the image move from 
left to right and from right to left??? thank you

Author: FPGA advisor (Guest)
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of course this is "normal" because if the non defined levels in video 
systems. For HDMI Yc ranges e.g. the threshholds have to shun the black 
and upper information levels and naturally issues will occur due to the 
non linear transformation from the 0..255 to 16..230 value range.

Dynamic (3D) smoothing is the key

Author: Mark Jomari (imaroj)
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what do you mean by "non defined levels in video systems".. im using a 
14Mpxel camera, then using the alterade2-115 i can interface the camera 
by the videoinput of the board,.

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