Kinovea

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In this guide you will learn in several steps how to capture videos at Kinovea1.


1.1 Plug in Falcon Eye camera/s into USB port/s

1.2 Run Kinovea

1.3 At the left camera menu you will find at cameras list one/two HD WEB camera/s, this is how Kinovea recognize Falcon Eye camera. Note that Falcon Eye does not require any driver installation under Windows operating system.

1.4 Please choose from icon menu One or Two camera capture screen view.

1.5 Drag and drop camera/s into camera capture screen.

1.6 Camera will start to work

At this stage please be patient to setup camera and software settings

It might be that at first camera use there is black screen, please do following steps:

2.1 Take off lens cap,

2.2 Turn on lights in the room where you are,

2.3 Open lens apperture, turn lens middle ring to O mark direction,

2.4 Change resolution on both cameras (top camera status bar) - try first with 800x600 and than continue with other resolutions.

When you have clear view at camera capture screen view you can continue with capturing. Please use single or common controls to capture videos.



Lens calibration - guide based at Joan Charmant, Kinovea project leader community forum instruction


Summary : film checkerboard pattern, import 5 images to Agisoft, export calibration file, import calibration in Kinovea.

1.1 In Agisoft Lens: Tools > Show chessboard.

1.2 Film the screen with the camera from up close. About 10 cm for a GoPro *(at this stage we recommend 1x1m chessboard and filming from 20-40cm from chessboard surface to camera). Film from 5 different angles: one central and the others from the corners. This assumes a flat screen.

1.3 Open the video in Kinovea.

1.4 In Kinovea: Find 5 clear images (no motion blur) corresponding to the 5 various points of view and export them as images.

1.5 In Agisoft Lens: Tools > add photos. Add the 5 images.

1.6 In Agisoft Lens: Tools > Calibration. Check every check box except "skew" and "k4". Run calibration.

1.7 In Agisoft Lens: File > Save calibration

1.8 In Kinovea: Image > Camera calibration. File > Import > Agisoft Lens. Import the file and Apply.

Done.

You can reuse the same calibration file for all videos filmed with this camera with the same lens settings. (If you change from wide angle to normal, another calibration file is needed.) Other cameras of the same model will have similar calibration files, but for the most accurate result you'll want to use a file specific to your camera.

The calibration computes the focal length, the misalignment of the lens center with regards to the sensor center, optical axis orientation with regards to the sensor plane, and distortion coefficients.

Verification

2.1 Go into the image tab in the calibration window and check the rectified image.

2.2 With a perspective plane.

- Reopen the checkerboard video in Kinovea.

- Add a perspective grid on the checkerboard and verifies that the lines are correctly distorted.

- Zoom to the max, adjust corners of the perspective grid and then calibrate the grid by the number of blocks covered horizontally and vertically.

- Display the coordinate system and check that it is correctly distorted. You can see the error accumulating at the periphery.

- Add a line covering a number of blocks, display its measurement and check that it matches.




1 For this short guide we used experimental version 0.8.25

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