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Well, guys, till now we have done the vehicles counting, entering and leaving.

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Plus we have also seen object tracking as well.

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So now I will only add the speed estimation code in the previous script, which we have implemented,

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in which we implemented our vehicles, counting, entering and leaving.

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So I will just add the speed estimation code in the in the previous script.

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So I have already explained you the speed estimation when I explained the vehicles counting the previous

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lectures.

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So if you haven't watched that lecture, do watch that lecture because in this lecture I will just add

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the speed estimation function over here.

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I will not go into very much detail, but if you want to go into the details of the speed estimation,

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you must watch the previous lecture of in which I explained the speed estimation code.

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The lecture name will be weakened counting and the speed estimation.

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So here in this script, in the vehicles counting, entering and leaving, I will just add the speed

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estimation code and give you a quick overview over here.

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So here I've added a speed estimation code.

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So I've created a function by the name estimate speed over here.

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So in this function you can see over here I am using, I'm first calculating the distance in pixels.

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So here to calculate the distance in pixels, I'm using a gradient distance formula which is square

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root x two minus x one square plus x two minus y one squared.

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So I'm just using the collodion distance for now over here.

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I've just let me write it down in this tense formula over here.

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So I'm just using a gradient distance formula over here.

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Calculate the distance in pixels, and here I've defined the pixel per meter as constant, which is

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eight.

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We can make it dynamic, like away from camera one and close to camera.

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The value of pixel per meter is 20, and to calculate the distance in meters, I need to divide divide

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the distance in pixel over pixels per meter.

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And here I'm calculating a time constraint.

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It's just a constant.

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You can make it dynamic as well.

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And here I'm calculating the speed I know.

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And you also know speed is equal to distance divided by time.

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But here the time constant is basically frequency.

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This is basically frequency, and time is equal to one over frequency.

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So it becomes speed is equal to distance in meters multiplied by frequency.

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So this time constant is equal to basically frequency.

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Okay.

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So we are just multiplying speed in these equations.

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So we are calculating speed is distance in meters multiplied by frequency, and in return we get the

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speed.

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Now I will call this estimate speed function in draw dash boxes function over here.

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Okay, so in this draw boxes function, I will calculate this call the estimate speed function over

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here.

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Okay.

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So you can see that here.

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I'm just calling.

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Let me show you where I'm just calling.

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So here I'm just calling the estimate speed function over here and I'm just passing, passing the.

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You can say that the center coordinates of the bottom of the bounding box over here to calculate the

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estimate speed.

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And just after calculating the object speed in the current frame, I'm just appending the speed values

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into the list by the name speed line queue, which can of object speed of with respect to each ID and

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the object id like each detected object has its own ID.

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And in the label section, I'm just displaying the speed over here.

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After object ID and the detected object name, for example, is car or truck.

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And after this the speed will appear.

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So I'm just adding the speed as well and I'm just presenting the speed in the form of kilometer per

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hour.

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So let me show you the result as I'm using C running this script on CPU.

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So I've just run the script before this video tutorial because CPU takes quite some time while in GPU

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it runs faster.

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So here are the results.

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Let me just open the results over here.

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So you can see that.

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Now, let's see, when this trail crosses this line, we get the speed.

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Okay?

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And now when this trail crosses the line, like you can see over here, this brown will intersect this

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green line.

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We get the speed.

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Okay.

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So when now when this truck will cross this line, when we get the speed.

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So this is the speed estimation, code explanation.

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So if this is all from this video tutorial, I hope you have learned a lot from this video tutorial

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series.

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See you all in the next video tutorial.

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Till then, bye bye.