EGOF-Net: epipolar guided optical flow network for unrectified stereo matching.

It is challenging to realize stereo matching in dynamic stereo vision systems. We present an epipolar guided optical flow network (EGOF-Net) for unrectified stereo matching by estimating robust epipolar geometry with a deep cross-checking-based fundamental matrix estimation method (DCCM) and then surpassing false matches with a 4D epipolar modulator (4D-EM) module. On synthetic and real-scene datasets, our network outperforms the state-of-the-art methods by a substantial margin. Also, we test the network in an existing dynamic stereo system and successfully reconstruct the 3D point clouds. The technique can simplify the stereo vision pipeline by ticking out rectification operations. Moreover, it suggests a new opportunity for combining heuristic algorithms with neural networks. The code is available on https://github.com/psyrocloud/EGOF-Net.

Eliminating unbalanced defocus blur with a binocular linkage network.

In this paper, we address the issue of the unbalanced defocus blur problem in stereo vision by a deblurring binocular linkage network. A similarity-enhanced loss function, which regularizes the difference between the output images by disparity warping, is proposed for the left-right sharpness consistency of the outputs. A high match rate is obtained. We test our methods on both synthetic and real data. The experimental results show that our method outperforms the state-of-the-art single and stereo deblurring methods for high accuracy in stereo matching, which is very helpful for long-distance stereo vision measurement.

Application of magnetic fields to wastewater treatment and its mechanisms: A review.

Magnetic field (MF) has been applied widely and successfully as an efficient, low-cost and easy-to-use technique to enhance wastewater treatment (WWT) performance. Although the effects of MF on WWT were revealed and summarized by some works, they are still mysterious and complex. This review summarizes the application of MF in magnetic adsorption-separation of heavy metals and dyes, treatment of domestic wastewater and photo-magnetic coupling technology. Furthermore, the mechanisms of MF-enhanced WWT are critically elaborated from the perspective of magnetic physicochemical and biological effects, such as magnetoresistance, Lorentz force, and intracellular radical pair mechanism. At last, the challenges and opportunities for MF application in WWT are discussed. For overcoming the limitations and taking advantages of MFs in WWT, fundamental research of the mechanisms of the application of MFs should be carried out in the future.

Effects of C/N ratio and dissolved oxygen on aerobic denitrification process: A mathematical modeling study.

COD to ammonium nitrogen (C/N) ratio and dissolved oxygen (DO) concentration are the most important factors affecting aerobic denitrification process, however, the effects of those on the mix-cultured aerobic denitrification process are still ambiguous. A mathematical model based on the framework of activated sludge model No. 3 (ASM3) was proposed for simulating nitrogen removal in an aerobic denitrification SBR process via anoxic/aerobic denitrification. AQUASIM 2.1G was employed for parameter estimation, sensitivity analysis and model calibration, as well as model validation. Ultimately, the impacts of the C/N ratio and the DO concentration on the aerobic denitrification process were revealed by the validated model. The model proposed well described nitrogen removal in an aerobic denitrification SBR process. The total nitrogen (TN) removal efficiency of the process increased with the increasing of C/N ratio and the decreasing of DO concentration. C/N ratio impacted the synthesis of cell internal storage products (XSTO), and the effects of DO concentration on the process resulted from the competition with substrate between heterotrophs and aerobic denitrifiers. High C/N ratio was preferred, however, the DO concentration should be maintained at a relatively lower level under the premise of ensuring the aerobic condition.

Effects of static magnetic field on the performances of anoxic/oxic sequencing batch reactor.

Two anoxic/oxic (A/O) sequencing batch reactor (SBR) processes were utilized to study the effects of static magnetic field (SMF) on biological wastewater treatment process. Except for conventional indices, the reduced nicotinamide adenine dinucleotide (NADH)/oxidized nicotinamide adenine dinucleotide (NAD+) ratio and electron transport system activity (ETSA), as well as poly-beta-hydroxybutyrate (PHB) and extracellular polymetric substance (EPS) contents in two reactors which were with and without SMF under two cyclic times (12 h and 8 h) were monitored. When the process was enhanced by SMF, the total nitrogen removal efficiency can be improved (>80%), and the NADN/NAD+ ratio, ESTA, the maximum EPS content and the maximum PHB content in the reactor with SMF were higher. Besides, SMF can reduce the microorganism community diversity and make species distribute more even and abundant. SMF can promote the performance of A/O SBR process via improving electron transport and microbial community.