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Online adaptive complementation tracker
EURASIP Journal on Wireless Communications and Networking volume 2018, Article number: 191 (2018)
Abstract
Correlation filterbased trackers have recently shown excellent performance in terms of motion blur and illumination changes, but they are notoriously sensitive to deformation. It has been demonstrated that the combination of the correlation filterbased tracker and the color histogrambased tracker can alleviate the deformation and keep advantages of the correlation filterbased tracker. However, the most existing complementary tracking algorithms, which use fixed complementary weights, limit the performance of every sub tracker. This paper introduces an adaptive complementary tracker by online learning dynamic complementary weights. The strategy enables inappropriate sub tracker to be downweighted while increasing the impact of suitable one. We jointly learn the sub trackers and their reliability weights by regression analysis of the corresponding historical tracking results. The robustness of the model also can be improved by training each sub tracker with the result of historical tracking. Finally, both qualitative and quantitative evaluations demonstrate that our tracker achieves the stateoftheart results in a wide range of tracking scenarios.
Background
Visual tracking plays an important role in computer vision and has received fastgrowth attention in recent years due to its wide practical application. In generic tracking, the task is to track an unknown target (only a bounding box defining the object of interest in a single frame is given) in an unknown video stream. This problem is very challenging due to the limited set of training samples and the numerous appearance changes, e.g., rotations, scale changes, occlusions, and deformations.
For solving these problems, many effective tracking models have been proposed [1] in recent years. These models can be categorized into methods based on subspace algorithms [2, 3], sparse representation [4,5,6,7,8], online classifiers [9,10,11,12], and so on. Recently, correlation filterbased tracking algorithms [13,14,15,16,17] have drawn increasing attention because of its dense sampling property and its fast computation in the Fourier domain.
Bolme et al. [13] propose the MOSSE tracker which finds a filter by minimizing the sum of squared error between the actual convolution outputs and the desired convolution outputs. The MOSSE tracker can handle several hundreds of frames per second because of the fast elementwise multiplication and division in the Fourier domain. Henriques et al. [18] extend correlation filters to a kernel space, leading to the Circulant Structure of TrackingbyDetection with Kernels (CSK) tracker which achieves competitive performance and efficiency. To further improve the performance, the KCF method [19] integrates multiple features into the CSK tracking algorithm. The Discriminative Scale Space Tracker (DSST) tracker [20] utilizes onedimensional correlation filters for online estimation of target scale to overcome a wide range of changes to target scale. Furthermore, Montero et al. [21] propose a scalable kernel correlation filter which introduces an adjustable Gaussian window function and a key pointbased model for scale estimation. This strategy can deal with the fixed size limitation in the Kernelized Correlation Filter.
Correlation filters are inherently confined to the problem of learning a rigid template. By learning their model from circular shifts of positive examples, correlation filters fail to learn a component that is invariant to permutations. This makes them inherently sensitive to shape deformation. This is a concern when the target experiences shaped formation in the course of a sequence. Yao et al. [22] decompose the target object into several parts to exploit the spatial information of the object appearances. Their strategies improve the tracker’s performance in situations like occlusions and deformations. In addition, color histograms were used in many early approaches to object tracking [23, 24]; they have been demonstrated to be competitive in the DistractorAware Online Tracking (DAT) [25]. More recently, Luca et al. [26] propose a simple linear combination of template and color histogram scores by a fixed weight to alleviate shape deformation. However, the fixed weight limits the performance of the combination model.
To solve the discussed problem above, this paper presents an online adaptive complementary tracker. The contributions of this work are twofold. First, we propose a novel formulation for jointly learning two sub trackers and their reliability weights. These sub trackers have better generalization ability, because they use more samples during training. Second, we online analyze the reliability of every sub tracking model in the current scene to realtime adjust their importance in the complementary model. By the adjustment of the adaptive weight, our combination model shows better performance.
Methods
Problem formulation
It is necessary to understand the realtime state of the scene for adaptively assigning the appropriate tracker to the current scene. We try to analyze the matching between every sub model and the scene by analyzing the regression deviation between the sub tracker and some history tracking results. This strategy is based on an assumption where all history tracking results are accurate and reliable. However, in practice, this assumption is uncertain. In order to avoid the unreliable assumption, we propose to jointly learn every sub tracking model and their corresponding reliability weights in a trackingbydetection framework. Figure 1 shows the diagram of the proposed method.
Specifically, our method jointly learns both sub trackers h_{1} and h_{2} and their weights α and β by minimizing a single loss function. To the best of our knowledge, we are the first to introduce the joint optimization framework by the joint loss,
Here, l_{1} and l_{2} denote two regression problems; they will be used to learn two sub models which make up our complementary appearance model. h_{1} is a correlation filterbased tracker, and its complementary tracker h_{2} is based on color histogram scores. The weight ε assures l_{1} and l_{2} consistent value interval. ℛ_{1}, ℛ_{2}, and ℛ_{3} are three independent regularization terms.
Constructing and solving the sub tracker h _{1}
We use the Backgroundaware Correlation Filters (BACF) model [27] as baseline model of h_{1} because it can effectively handle the boundary effect which is a fundamental drawback to traditional correlation filterbased trackers. However, similar to many other correlation filterbased trackers, the BACF model also depends strongly on the spatial layout of the tracked object, so is sensitive to deformation. In addition, the BACF model ignores the problem of corrupted samples, and when those corrupted samples are included in the training set, the model drift may be caused.
Being motivated by [28], we develop the BACF model into Eq. 2 to learn our sub tracker h_{1}:
where P denotes transform matrix which is a E × J binary matrix for cropping mid E elements of sample \( {\varphi}_i^d \), E ≪ J. The cropped patch corresponding to the peak of the correlation output displays the target (positive example), and those corresponding to the zero values of the correlation output display the background content (negative examples). The transform matrix P can be precomputed, and \( P{\varphi}_i^d \) can be efficiently performed via a lookup table. φ is expressed by Histogram of Oriented Gradients (HOG) features. Compared with [28], our method adopts the sampling strategy of the BACF, which introduces the transform matrix P into cyclic sampling to improve the distinction between samples. More importantly, the proposed optimization model of the parameter h_{1} not only purifies the training sample set, but also verifies the reliability of the model for current sequence.
For improving computing speed, Eq. 2 can be expressed in the frequency domain as:
where \( \widehat{g} \) is an auxiliary variable and the matrix \( {\widehat{\varphi}}_i \) is defined as \( {\widehat{\varphi}}_i=\left[\mathit{\operatorname{diag}}{\left({\phi}_i^1\right)}^T,\dots, \mathit{\operatorname{diag}}{\left({\phi}_i^d\right)}^T,\dots \mathit{\operatorname{diag}}{\left({\phi}_i^D\right)}^T\right] \). The matrix I_{D} is an D × D identity matrix, and the operator ⊗ is the Kronecker product. A ˆ denotes the discrete Fourier transform (DFT). The orthonormal matrix F can map any J dimensional vectorized signal to the Fourier domain. T indicates the transpose operator, which computes the conjugate transpose on a complex vector or matrix.
We can rewrite Eq. 3 into an augmented Lagrangian form, then it can be iteratively solved by the ADMM [29] technique.

A.
Solving sub problem h _{1} ^{∗}

B.
Solving sub problem \( {\widehat{g}}^{\ast } \)
Because \( {\widehat{\varphi}}_i \) is sparse banded, each element of \( \widehat{\mathrm{y}} \) is dependent only on D values of \( {\widehat{\varphi}}_i(j)={\left[{\widehat{\varphi}}_i^1(j),\dots, {\widehat{\varphi}}_i^D(j)\right]}^T \) and \( \widehat{g}(j)={\left[ conj\left({\widehat{g}}^1(j)\right),\dots, conj\left({\widehat{g}}^D(j)\right)\right]}^T \). Here, the operator conj (.) indicates the complex conjugate transform. Similar to [27], solving Eq. 5 for \( {\widehat{\mathrm{g}}}^{\ast } \) can be identically expressed as J smaller, independent objectives, solving for \( \widehat{g}{(j)}^{\ast } \):
where, \( {\widehat{h}}_1(j)=\left[{\widehat{h}}_1^1(j),\dots, {\widehat{h}}_1^D(j)\right] \) and \( {\widehat{h}}_1^D=\sqrt{D}\left({FP}^T{h}_1^D\right) \). Then, Eq. 6 is minimized by solving the normal equations:
To design an efficient method, we solve Eq. 7 by the GaussSeidel iteration. Set \( A= J\mu {I}_D+{\sum}_{i=1}^t{\alpha}_i{\widehat{\varphi}}_i(j){\widehat{\varphi}}_i{(j)}^T \) which is symmetric and positive definite. The GaussSeidel method decomposes the matrix A into a lower triangular component L and a strictly upper triangular component U, such that A = U + L. The filter \( \widehat{g}{(j)}^{\ast } \) is then iteratively calculated by equation:
Here, m is mth iteration in GaussSeidel iteration operation.

C.
Lagrangian vector update
Then, we update the Lagrangian vector as:
where n indicates the nth iteration in the ADMM operation.
Constructing and solving the sub tracker h _{2}
Similar to [26], we also use the color histogrambased model as the complementary tracker of h_{1}. The difference is that we extend the training set of the model in the time dimension. The expanded model, which makes use of more diverse training samples and has better robustness, can be learn by optimizing Eq. 10:
The regression problem can be described as:
where \( \mathcal{O} \) and \( \mathcal{B} \) denote the target area and background area.
In the ridge regression problem, the solution of the per feature dimension is:
where \( {\rho}^d\left(\mathcal{A}\right)={N}^d\left(\mathcal{A}\right)/\left\mathcal{A}\right \) is the proportion of pixels in a region for which feature d is nonzero. \( {N}^d\left(\mathcal{A}\right)=\left\left\{u\in \mathcal{A}:k\left[u\right]=d\right\}\right \) is the number of pixels in the region \( \mathcal{A} \) of the feature ψ.
Solving the reliability weights α and β
When h_{1} and h_{2} are obtained, Eq. 1 can be expressed as an optimization problem for α and β. The optimization problem about α and β can be rewritten into the following form:
where w = [w_{1}, w_{2}, …w_{i}…w_{t}], L = [L_{1}, …, L_{i}, …, L_{t}]^{T}, w_{i} = (α_{i}, ε^{∗}β_{i}), α_{i} > 0, β_{i} > 0, and L_{i} = (l_{1}, l_{2})_{i}^{T}. p_{i} is the prior weights whose definition is similar with one in [28], p_{i} > 0 and \( {\sum}_{i=1}^t{p}_i=1 \). In the control of the parameter p_{i}, recent fame is given larger attention to account for fast appearance changes.
We can use the convex quadratic programming methods in Matlab’s Optimization Toolbox to solve the above optimization problem.
Solving the complementary weights
Our score function is a linear combination of template and histogram scores:
\( {f}_{h_1} \) denotes a template scores, which is the confidence map acquired by correlation operation between correlation filter g and spatial layout features φ.
\( {f}_{h_2} \) denotes a histogram scores, which is computed from an Mchannel feature image.
The complementary weight γ is an adaptive variable instead of preassigned constant as one in [26]. Reliability weights obtained by Eq. 13 can reflect the reliability of the corresponding sub model. To alleviate the problem of rapid appearance changes, we choose the reliability weights of the nearest n (n = 10) frames to dynamically adjust our weight γ. In addition, considering that correlation filterbased tracker is more favorable for accurate location than the color histogrambased tracker, we choose the template scores as the main tracking scores while the color histogram scores as accessorial ones. Based on the discussion above, we construct the following complementary weight model:
Here, σ_{1} and σ_{2} are the variances of the data set {α_{i} − p_{i} i = t − n, …, t} and {β_{i} − p_{i} i = t − n, …, t}, respectively. \( {\mathcal{T}}_{\mathrm{low}} \) and \( {\mathcal{T}}_{\mathrm{up}} \) are the lower threshold and upper threshold respectively.
Experimental results and discussion
The proposed method in this paper is implemented in MATLAB 2016a. We perform the experiments on a PC with Intel i74790 CPU (3.6GHz) and 16GB RAM memory, and the tracker runs at 15 fps. We extensively evaluate the performance of the proposed tracker with the total 100 challenging sequences from [30] and compare our tracker with the top 10 stateoftheart trackers, including DSST [20], Structured Output Tracking with Kernels (Struck) [31], BACF [27], TrackingbyDetection (TLD) [32], CSK [18], Spatially Regularized Discriminative Correlation Filters (SRDCF) [33], Tracking via Multiple Experts Using Entropy Minimization (MEEM) [34], Adaptive Color Tracker (ACorT) [35], Staple, and DAT [25]. The DSST, the CSK, the SRDCF, and the ACorT belong to the correlation filterbased tracker, which more attention to the structural attribute of the target. The Struck, the TLD, and the MEEM are tracking algorithms based on classifier learning, which divides the scene into target and background. The DAT belongs to the unstructured tracker, which is suitable for the tracking target with severe deformation. The Staple is a combined tracker, which has the strongest correlation with our algorithm.
Parameter setting
In the proposed tracking model, the HOG feature and the color histogram feature are two important factors affecting the computation. During the experiment, we set HOG features to 31 channels and use cell size of 4 × 4 pixels in order to be unified with other algorithms, e.g., BACF, Staple, DSST, and CSK. The size of the search region is set to be 4^{2} times the size of the target area in all the algorithms. Then, we normalized samples to a fixed size by a 50 × 50 square, so that the fps is unaffected by the height and width of video sequence. In the Alternating Direction Method of Multipliers (ADMM) optimization, we set the number of iterations to 4, which is enough to ensure algorithm robustness. Although more iteration is beneficial to improve algorithm performance, it will affect computational efficiency. The penalty factor μ is set to 0.25. The regularization factor λ_{`1} and λ_{2} are set to 0.001 and 0.01, respectively. The iterations of the GaussSeidel method are set to be 5, and the learning rate is adopted as η = 0.02. The lower threshold \( {\mathcal{T}}_{\mathrm{low}}=0.15 \) and the upper threshold \( {\mathcal{T}}_{\mathrm{up}}=0.8 \). Moreover, bin color histogram is set into 32 × 32 × 32, which has similar settings with the Staple tracker. All parameters remain fixed in all experiments. We run our approach approximately for 15 frames per second.
In practice, the penalty factor, the regularization factor, ADMM iteration number, and the GaussSeidel iteration number are independent of the specific scenario and only related to the proposed model itself. The cell size of HOG features, the size of the search region, and the bin color histogram, these three parameters will be affected by the target size and image resolution.
Qualitative evaluation
Figure 2 shows the tracking results of 10 stateoftheart trackers and our tracker on some most challenging scenes (i.e., occlusion, deformation, fast motion, inplane rotation, and outplane rotation) in the OTB (object tracking benchmark) [30].
Figure 2a shows the tracking results on the Box and Coke sequences. In this figure, the targets undergo partial or shortterm total occlusions. Our tracker can effectively track these objects, which benefits from two factors. First, our approach is capable of reducing or removing the impact of uncorrupted samples by readjusting the reliability weights of the sub model in training, thereby lowering the risk of drift and tracking failure. Second, the uncorrupted part of the targets and the background context can still form some uncorrupted samples for training and detection, which is similar to BACF. Most of the traditional correlation filterbased trackers DAT, CSK, ACorT, and DSST may drift after occlusions or fail to track the targets because their search areas are limited and uncorrupted samples are used during the training. BACF and SRDCF can handle some slight occlusions, but when undergo severe occlusions, they all drift away.
Figure 2b is the tracking results on the KiteSurf and Couple sequences. KiteSurf and Couple are two sequences of some representative sequences where the target is fast motion. The figure shows that the proposed tracker gain outstanding performance handles. This can be mainly attributed to the correlation filters and the discriminative ability of the proposed method. The proposed method works well in all these sequences. On the one hand, the color histogram information can be used effectively to handle deformations by dynamically increasing the impact of color histogrambased tracker. On the other hand, when target is in fast motion, the impact of correlation filterbased tracker will be dynamically increased. The sub tracker can effectively handle fast motion because allows larger search region. Other trackers also have some abilities against target deformations (i.e., Stape and MEEM), but most of them are failed to track targets when severe deformations are coming.
Figure 2c shows the tracking results on two representative sequences Rubik and DragonBaby s where the targets are partially or fully occluded. Our tracker performs well in inplane rotation and outplane rotation. These properties mainly benefit from upweighting color histogrambased tracker.
For the six representative sequences above, we compared center location error of every sequence framebyframe in Fig. 3. These comparison results show that our tracker is more stable and accurate.
Table 1 reports average entry location errors for each compared tracker. In a descending order, the best three estimates are marked in red, blue, and green fonts. In one of the six sequences (the Box and DragonBaby), our approach achieved the best results. In two of the remaining four sequences (the Rubik and Couple sequences), our approach obtained the second best results and were very close to the best ones. In the remaining two sequences (Coke and Kitesurf), our tracker also performs better. Generally, our method performed well against existing trackers.
Quantitative evaluation
We use the precision plots and the success plots metric [30] to compare all trackers on OTB100. Precision plot reports the average distance precision score at 20 pixels for each method. In the evaluation of success plots, the area under the curve (AUC) of success plots is used to rank the trackers.
The evaluation results of the proposed tracker and the 10 competitive trackers are demonstrated in Fig. 4. The legend of the precision plot reports the average distance precision score at 20 pixels for each method, and the legend of the success plot reports AUC scores. The BACF tracker provides the second best results with precision plots of 82.0% and the success plots of 60.6%. The best results on this dataset is achieved by our tracker with a precision plot of 85.1% and a success plot of 62.8%, leading to a significant gain of 3.0 and 2.2% compared to BACF tracker in precision plots and success plots in turn.
Table 2 reports the AUC scores of all the compared trackers under some challenging problems which were posed in the OTB sequences including 31 sequences with target inplane rotation (IPR), 39 sequences with target outofplane rotation (OPR), 19 sequences with target deformation (DEF), including 29 sequences with target occlusion (OCC) and 17 sequences with target fast motion (FM). In a descending order, the top three results are shown in red, blue, and green fonts. Our tracker achieves highest AUC scores in all these challenging attributes.
Conclusions
In order to alleviate the deformation, this paper presents to online learn an adaptive complementation tracking algorithm. The proposed strategy can dynamically adapt the importance of each sub tracker according to the realtime status of the scene, making the tracker more robust for various target appearance changes. In addition to, joint learning model reliability weights and tracker can also effectively control the reliability of training samples and improved the discriminability of the tracker. Experimental results show that our approach outperforms stateofthe art tracking algorithms on many challenging videos from the OTB.
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Acknowledgements
The authors would like to thank Image Engineering &Video Technology Lab for the support.
Funding
This work was supported by the Major Science Instrument Program of the National Natural Science Foundation of China under Grant 61527802 and the General Program of the National Natural Science Foundation of China under Grants 61371132 and 61471043.
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GS and TX conceived and designed the algorithm and the experiments. GS was responsible for most of the implementation of the algorithms. JL, JG, ZR, and GS analyzed the data. GS provided suggestions for the proposed method and its evaluation, and assisted in the preparation of the manuscript. All authors read and approved the final manuscript.
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Shi, G., Xu, T., Luo, J. et al. Online adaptive complementation tracker. J Wireless Com Network 2018, 191 (2018). https://doi.org/10.1186/s136380181198y
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DOI: https://doi.org/10.1186/s136380181198y
Keywords
 Correlation filter
 Online learning
 Visual tracking
 Complementary tracker