The Visualization Society of Japan provides PIV-standard images for evaluating PIV and PTV algorithms. By using the PIV-standard images, post-processing methods of PTV have been evaluated by reconstructing the vorticity with or without errors in PTV data. As a result, one of the post-processing methods, named "Biquadratic-ellipsoidal Equation Rearrangement" method, has a good performance in case of no error, but the method is liable to be influenced by the errors.