The existing eye trackers typically require an explicit personal calibration procedure to estimate subject-dependent eye parameters. Despite efforts in simplifying the calibration process, such a calibration process remains unnatural and bothersome, in particular for users of personal and mobile devices. To alleviate this problem, we introduce a technique that can eliminate explicit personal ca...

For calibrating the camera, an accurate determination of the interior orientation parameters is needed. For more accurate results, the calibration images should be taken under conditions that are similar to the field samples. The aim of this work is the establishment of an efficient and accurate digital camera calibration method to be used in particular working conditions, as it can be found wi...

The quest for the best solution to the geometrical camera calibration problem is ongoing up to the present. For simplicity and good adaptivity to the pinhole model many methods use sets of co-planar fiducial points. In this paper we do not invent a new technique, but investigate and describe major and minor differences of three most widely used plane-based calibration algorithms. Formulation an...

a new method was developed for the spectral resolution by further determination of three- and  four-component  mixtures  of  drugs in urine samples through  the complementary application of multivariate curve resolution-alternating least squares with correlation  constraint. in the current study, a simple method was proposed to construct a calibration set for the mixture of drugs in the presenc...

BACKGROUND Online hearing tests conducted in home settings on a personal computer (PC) require prior calibration. Biological calibration consists of approximating the reference sound level via the hearing threshold of a person with normal hearing. OBJECTIVE The objective of this study was to identify the error of the proposed methods of biological calibration, their duration, and the subjecti...

In this paper we approach the problem of insitu camera calibration using an auxiliary mobile color-depth camera. The calibration is based on image lines and the Direct Linear Transformation (DLT). Calibration includes intrinsic and extrinsic parameters, and radial distortion. Traditionally, camera calibration methods based on DLT combine 2D and 3D points. Using 2D image lines allows adding simp...

BACKGROUND Breast density is a significant breast cancer risk factor measured from mammograms. The most appropriate method for measuring breast density for risk applications is still under investigation. Calibration standardizes mammograms to account for acquisition technique differences prior to making breast density measurements. We evaluated whether a calibration methodology developed for an...