| # -*- coding: utf-8 -*- | |
| # Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. (MPG) is | |
| # holder of all proprietary rights on this computer program. | |
| # You can only use this computer program if you have closed | |
| # a license agreement with MPG or you get the right to use the computer | |
| # program from someone who is authorized to grant you that right. | |
| # Any use of the computer program without a valid license is prohibited and | |
| # liable to prosecution. | |
| # | |
| # Copyright©2020 Max-Planck-Gesellschaft zur Förderung | |
| # der Wissenschaften e.V. (MPG). acting on behalf of its Max Planck Institute | |
| # for Intelligent Systems. All rights reserved. | |
| # | |
| # Contact: ps-license@tuebingen.mpg.de | |
| import numpy as np | |
| # TODO: use a real subsampler.. | |
| def subsample(num_frames, last_framerate, new_framerate): | |
| step = int(last_framerate / new_framerate) | |
| assert step >= 1 | |
| frames = np.arange(0, num_frames, step) | |
| return frames | |
| # TODO: use a real upsampler.. | |
| def upsample(motion, last_framerate, new_framerate): | |
| step = int(new_framerate / last_framerate) | |
| assert step >= 1 | |
| # Alpha blending => interpolation | |
| alpha = np.linspace(0, 1, step+1) | |
| last = np.einsum("l,...->l...", 1-alpha, motion[:-1]) | |
| new = np.einsum("l,...->l...", alpha, motion[1:]) | |
| chuncks = (last + new)[:-1] | |
| output = np.concatenate(chuncks.swapaxes(1, 0)) | |
| # Don't forget the last one | |
| output = np.concatenate((output, motion[[-1]])) | |
| return output | |
| if __name__ == "__main__": | |
| motion = np.arange(105) | |
| submotion = motion[subsample(len(motion), 100.0, 12.5)] | |
| newmotion = upsample(submotion, 12.5, 100) | |
| print(newmotion) | |