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Re: [OpenCV] Double thresholding

 

Have you tried

if (im1 > im2) im3 = 1;
else im3 = -1;

Maybe a comparison runs faster than 4 aritmetics...

openvictor Open wrote:
>
>
> Dear all,
>
> Here is my problem : I am trying to do a background update by adding a
> fixed quantity (for simplicity let's say +1 or -1) depending on the
> substraction of two images.
> For example : we have a first image im1 and a second im2
> We do im1 - im2 = im3.
> I want im3 to just keep the "sign" of the substraction ( the +1 and
> -1) I don't want to have the result of the actual substraction, let's
> say if one element of im3 is +93 I want it to be +1 if it's -25 I want
> it to be -1.
>
> The only way I think of is :
> 1. im1 - im2 , take the threshold for element superior or equal to 1,
> 2. im2 - im1 take the threshold for elements superior or equal to 1
> 3 subtract result of 1. to im1
> 4 subtraction the result of 2. to the result of 3.
>
> Fastidious and I think quite time consuming. Is there another, quicker
> way for doing such a thing, like a double threshold ?
>
> Thank you all,
>
> Best regards,
> Victor
>
>
>

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[OpenCV] [ASK] The best way to find coordinate of moving infrared led light on a video?

 

Hi everyone, i'm currently learning opencv..
what is the best way to find the coordinate of infrared bulb?
my goal is to track moving infrared light and find their coordinates..
i've implemented some method but the tracking seems running low and not fast..
thanks

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[OpenCV] Programs Included With a New Computer

 

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