# Revision history [back]

### Which object recognition algorithm should I use?

I am pretty new to CV, so forgive my stupid questions...

What I want to do: I want to recognize a RC plane in live video (for now its only a recorded video).

What I have done so far:

• Differences between frames
• Convert it to grey scale
• GaussianBlur
• Threshold
• findContours

Here are some example Frames: C:\fakepath\frame.jpg C:\fakepath\frame1.jpg C:\fakepath\frame2.jpg C:\fakepath\frame3.jpg C:\fakepath\frame4.jpg

But there are also frames with noise or other objects (birds,..), so there are more objects in the frame.

I thought I could do something like this: Use some object recognition algorithm for every contour that has been found. And compute only the feature vector for each of these bounding rectangles. Is it possible to compute SURF/SIFT/... only for a specific patch (smaller part) of the image? Since it will be important that the algorithm is capable of processing real time video I think it will only be possible if I don't look at the whole image all the time?! Or maybe decide for example if there are more than 10 bounding rectangles I check the whole image instead of every rectangle. Then I will look at the next frame and try to match my feature vector with the previous frame. That way I will be able to trace my objects. Once these objects cross the red line in the middle of the picture it will trigger another event. But that's not important here.

I need to make sure that not every object which is crossing or behind that red line is triggering that event. So there need to be at least 2 or 3 consecutive frames which contain that object and if it crosses then and only then the event should be triggered.

There are so many variations of object recognition algorithms, I am bit overwhelmed. Sift/Surf/Orb/... you get what I am saying.

Can anyone give me a hint which one I should chose or if what I am doing is even making sense?

Thx, JAy

### Which object recognition algorithm should I use?

I am pretty new to CV, so forgive my stupid questions...

What I want to do: I want to recognize a RC plane in live video (for now its only a recorded video).

What I have done so far:

• Differences between frames
• Convert it to grey scale
• GaussianBlur
• Threshold
• findContours

Here are some example Frames: C:\fakepath\frame.jpg C:\fakepath\frame1.jpg C:\fakepath\frame2.jpg C:\fakepath\frame3.jpg C:\fakepath\frame4.jpg

But there are also frames with noise or other objects (birds,..), so there are more objects in the frame.

I thought I could do something like this: Use some object recognition algorithm for every contour that has been found. And compute only the feature vector for each of these bounding rectangles. Is it possible to compute SURF/SIFT/... only for a specific patch (smaller part) of the image? Since it will be important that the algorithm is capable of processing real time video I think it will only be possible if I don't look at the whole image all the time?! Or maybe decide for example if there are more than 10 bounding rectangles I check the whole image instead of every rectangle. Then I will look at the next frame and try to match my feature vector with the previous frame. That way I will be able to trace my objects. Once these objects cross the red line in the middle of the picture it will trigger another event. But that's not important here.

I need to make sure that not every object which is crossing or behind that red line is triggering that event. So there need to be at least 2 or 3 consecutive frames which contain that object and if it crosses then and only then the event should be triggered.

There are so many variations of object recognition algorithms, I am bit overwhelmed. Sift/Surf/Orb/... you get what I am saying.

Can anyone give me a hint which one I should chose or if what I am doing is even making sense?

Thx, JAy

### Which object recognition algorithm should I use?

I am pretty new to CV, so forgive my stupid questions...

What I want to do: I want to recognize a RC plane in live video (for now its only a recorded video).

What I have done so far:

• Differences between frames
• Convert it to grey scale
• GaussianBlur
• Threshold
• findContours

Here are some example Frames: C:\fakepath\frame.jpg C:\fakepath\frame1.jpg C:\fakepath\frame2.jpg C:\fakepath\frame3.jpg C:\fakepath\frame4.jpg

But there are also frames with noise or other objects (birds,..), so there are more objects in the frame.

I thought I could do something like this: Use some object recognition algorithm for every contour that has been found. And compute only the feature vector for each of these bounding rectangles. Is it possible to compute SURF/SIFT/... only for a specific patch (smaller part) of the image? Since it will be important that the algorithm is capable of processing real time video I think it will only be possible if I don't look at the whole image all the time?! Or maybe decide for example if there are more than 10 bounding rectangles I check the whole image instead of every rectangle. Then I will look at the next frame and try to match my feature vector with the previous frame. That way I will be able to trace my objects. Once these objects cross the red line in the middle of the picture it will trigger another event. But that's not important here.

I need to make sure that not every object which is crossing or behind that red line is triggering that event. So there need to be at least 2 or 3 consecutive frames which contain that object and if it crosses then and only then the event should be triggered.

There are so many variations of object recognition algorithms, I am bit overwhelmed. Sift/Surf/Orb/... you get what I am saying.

Can anyone give me a hint which one I should chose or if what I am doing is even making sense?

Thx, JAy

### Which object recognition algorithm should I use?

I am pretty new to CV, so forgive my stupid questions...

What I want to do: I want to recognize a RC plane in live video (for now its only a recorded video).

What I have done so far:

• Differences between frames
• Convert it to grey scale
• GaussianBlur
• Threshold
• findContours

Here are some example Frames: C:\fakepath\frame1.jpg C:\fakepath\frame2.jpg C:\fakepath\frame3.jpg C:\fakepath\frame4.jpg

But there are also frames with noise or other objects (birds,..), so there are more objects in the frame.

I thought I could do something like this: Use some object recognition algorithm for every contour that has been found. And compute only the feature vector for each of these bounding rectangles. Is it possible to compute SURF/SIFT/... only for a specific patch (smaller part) of the image? Since it will be important that the algorithm is capable of processing real time video I think it will only be possible if I don't look at the whole image all the time?! Or maybe decide for example if there are more than 10 bounding rectangles I check the whole image instead of every rectangle. Then I will look at the next frame and try to match my feature vector with the previous frame. That way I will be able to trace my objects. Once these objects cross the red line in the middle of the picture it will trigger another event. But that's not important here.

I need to make sure that not every object which is crossing or behind that red line is triggering that event. So there need to be at least 2 or 3 consecutive frames which contain that object and if it crosses then and only then the event should be triggered.

There are so many variations of object recognition algorithms, I am bit overwhelmed. Sift/Surf/Orb/... you get what I am saying.

Can anyone give me a hint which one I should chose or if what I am doing is even making sense?

Thx, JAy