New algorithms have been implemented and tested for the use in particle tracking velocimetry (PTV). These new algorithms have been introduced mainly in the part of particle tracking itself, but as well as in the preceding part of individual particles extraction. For the particle tracking, the relaxation method is used with a number of improvement and refinement from the original algorithm. The extraction of individual particles or the detection of particle centers is a no less important process for the accuracy of PTV and there are four algorithms tested in the present work. Among them are included two new algorithms, using a modified Moravec operator for particle centers detection as well as a dynamic threshold method for image binarizaion.