a fiducial marker system using digital techniques

In a previous article I mentioned Pyto so I thought I would write a script that would find an ArUco marker and then draw a box around it, from a live camera feed on my iPhone. Detecting an ArUco marker with OpenCV and Python Two of the authors of that paper, Rafael Muñoz and Sergio Garrido, produced a module to work with them and this in turn was incorporated into OpenCV as the aruco module. The markers that they proposed are known as ArUco markers. Using fiducial markers makes this process a lot easier. Camera pose estimation is a process of finding correspondences between points in the real environment and their 2D image projection. In 2014 a research paper was produced which proposed a fiducial marker system specially designed for camera pose estimation. No fiducial should be >5 cm or >6 cm away from the lesion. Fiducials should not be placed in the same plane (eg, the same axial-CT image plane), in such a way that they form about a 45-degree angle with the horizon (Figure 7). For example, if you were taking a picture of someone standing next to a ruler to see how tall they were, the ruler would be acting as a fiducial marker. Optimally, the markers should be placed in different planes in the x-, y-, and z-axes (Figure 6).3-5. It may be either something placed into or on the imaging subject, or a mark or set of marks in the reticle of an optical instrument.” Fiducial markers have been used in lots of different settings as measures. Due to the sensitivity of electrodeposited films' microstructure and properties on the processing conditions, characterization of LIGA mechanical. According to Wikipedia a fiducial marker “is an object placed in the field of view of an imaging sys tem which appears in the image produced, for use as a point of reference or a measure. Photolithographically defined thin film Au dots were used as micro fiducial markers for digital image correlation (DIC), to enable two-dimensional strain measurement of 200 m-thick LIGA (Lithographie, Galvanformung, Abformung) nickel alloys.

A fiducial marker system using digital techniques