eric_engineer's profile - activity

trouble converting Euler angles to rotation matrix for cal I have this matched pair of stereo cameras that come with cal

SystemError: new style getargs format but argument is not a tuple I'm trying to use my own calibration values for stereo

Auto rotation of two point clouds from stereo rig I built this stereo camera rig and eventually I was able to get to the

Auto rotation of two point clouds from stereo rig I built this stereo camera rig and eventually I was able to get to the

Build OpenCV 4.x for Android with c++_static I had been happily using opencv as a shared library, but now I want to try

I guess if I think about it some more, if I change the resolution lower, but the FOV remains the same, then it's almost

I specify the image size in my request to the android camera driver, then the camera or the ISP crops and returns it. I

Thanks for the follow up, I'm still messing around trying to get this right. I have the full datasheet for the camera a

Another mistake I might have made. I took these pictures at 640x360 while the native resolution of the camera is 4256x3

I see your point about units, but doing this: OBJECT_POINT_ZERO[:, :2] = np.mgrid[0:7,0:7].T.reshape(-1,2) * 26.32 gav

I see your point about units, but doing this: OBJECT_POINT_ZERO[:, :2] = np.mgrid[0:7,0:7].T.reshape(-1,2) * 26.32 gav

Yes! I was wondering the same thing, but I don't see how to set it python.

camera calibration focal length is wrong So I'm sure this is my error, just not sure what I'm doing wrong. I had started

Thank you that's a pretty cool video.

Thanks for the advice as usual

I wrote a simple python script to process an mp4 video that I took with my phone. The phone was propped up with a clamp, and held perfectly still. It's just looking at my room, there's no motion going on. So I process that video through SIFT, and draw keypoints for every frame then output the video.

Why do some keypoints come and go if it's the same static room in the recording? Is there some uncertainty or randomness inherent in the detector algorithm? Or is it more likely some compression artifacts introduced by the H.264 encoding? Maybe my lighting that's running at 60hz is dimming just enough to periodically cause different frames? I'm not sure but these are the things I'm speculating about.

If I ran SIFT against the same JPEG hundreds of time would you expect to get the same exact keypoints or would some of them come and go as well?

Thanks for any advice you can give, I'm just curious about why this sort of thing happens.

Edit: I took a jpeg picture of my room and and ran it through SIFT feature detect a few hundred times, and made the output a mp4. Features in that were rock solid :) So... it's something that changes in my stream or maybe lighting I guess.

Curious as to why keypoints in video of static room seem to come and go I wrote a simple python script to process an mp4

Curious as to why keypoints in video of static room seem to come and go I wrote a simple python script to process an mp4

making the optimal target for SIFT I'm working on tracking a doughnut shaped target with SIFT as the detector. I just d

Thank you, I didn't even consider Fiverr for something like this.

Does anyone know of someone I could hire to setup a build environment for opencv from source? I've been at it for a while and I just can't seem to get the final building of the android project piece to work.

Thank you

optimizing approach for SIFT detection I'm running SIFT detection of a target in Python on Windows with a 2.7Ghz i7-6820

Sorry this was an error on my part.

KCF Tracker not updating bounding box in Java I'm trying to implement KCF tracking function in Android but when I call u

Hire someone for build environment setup for Android Does anyone know of someone I could hire to setup a build environme

Thanks so much for sharing these, it really helped me out!

Android 3.4.6 build from source I'm going crazy trying to build and Android version from scratch again. It seems no mat

Improving or adjusting ORB performance I'm using an ORB feature detector in Java with a camera feed. I don't seem to fi

Finally got it to work thanks for the tips.

Yes :) I have been pouring over that for the last two hours. I'm curious if this section in the tutorial has the queryI

Figure out scale and rotation of template image based on matched keypoints I was able to use ORB matching to match my te

I disabled PROTBUF and now building the android project is failing because it can't find opencv

Building latest master for android but missing Java folder I'm trying to build the latest master for Android. I struggl

okay after installing ant, setting some env variables, and setting ANT_EXECUTABLE in Cmake I get Java wrappers YES. Now

Sure, and thank you for all the help so far.

Building latest master for android but missing Java folder I'm trying to build the latest master for Android. I struggl

Building latest master for android but missing Java folder I'm trying to build the latest master for Android. I struggl

So was already using 4.1.0 and I can't get it to work there. I'm trying to build master from source buy having trouble

I was using SimpleBlobDetection in 3.x in Java. Then I updated to 4.x and now I can't find it anywhere. FeatureDetector seems to have been replaced by FastFeatureDetector, but I can't find SimpleBlob anywhere.

Thank you

If I do an import org.opencv.features2d.SimpleBlobDetector;. I get a cannot resolve symbol SimpleBlobDetector. If I we

Where did SimpleBlobDetection go? I was using SimpleBlobDetection in 3.x in Java. Then I updated to 4.x and now I can't

Sure I should have done that before. I added to my question up top. This is my tube, depending on the length of the tub