September 13, 2021
When reporting on sports activities video games dwell or remotely, commentators ought to be capable of rapidly acknowledge the numbers on the gamers’ jersey shirts, as this enables them to maintain up with what’s occurring and talk it to their viewers. Nonetheless, rapidly figuring out gamers in sports activities movies shouldn’t be all the time straightforward, as these movies are sometimes taken at a distance to seize the general development of the sport. An extra issue is the quick movement of the printed digital camera that usually leads to movement blur.
Researchers at College of Waterloo have not too long ago developed a machine-learning method that may routinely acknowledge jersey numbers of gamers in photos extracted from broadcast sports activities movies. This system, introduced in a paper pre-published on arXiv, might assist to determine the jersey numbers of group gamers throughout sports activities occasions sooner and extra effectively than different present computational strategies.
“Sports activities jersey quantity recognition networks in present literature think about jersey quantity recognition as a classification drawback and both (1) think about the jersey numbers as separate courses (holistic illustration), or (2) deal with the 2 digits in a jersey quantity as two unbiased courses (digit-wise illustration),” Kanav Vats, one of many researchers who carried out the research, instructed Tech Xplore. “For instance, the jersey quantity ’12’ will be modeled by contemplating ’12’ as a separate class and in addition by splitting the quantity ’12’ into two constituent digits ‘1’ and ‘2’ and treating the 2 digits as separate courses.”
Previous research have discovered that studying a number of output representations can enhance the efficiency of deep neural networks. In different phrases, neural networks which are educated to concentrate on completely different points of the duty they’re studying to finish have been discovered to carry out higher than these specializing in particular person points of the duty.
“The enter to the Resnet34 backbone-based community is a single-player picture,” Vats mentioned. “The community outputs three likelihood vectors. The primary is the likelihood of the jersey quantity current within the picture contemplating every jersey quantity within the dataset as a separate class, the second is the likelihood distribution of the primary digit within the jersey quantity and the third is the likelihood of the second digit within the jersey quantity.”
The researchers educated their neural community with the weighted sum of the cross-entropy lack of the three outputs they centered on. Once they examined their community, they discovered that studying each holistic (e.g., ’12’) and digit-wise (e.g., ‘1’ and ‘2’ in ’12’) representations of numbers considerably improved their community’s potential to acknowledge jersey numbers. Actually, their multi-task studying strategy outperformed different methods that solely centered on both the holistic illustration or digit-wise representations.
“‘When the multi-task loss perform community we proposed was plugged right into a community launched in a earlier research, it confirmed a major enchancment in efficiency,” Vats mentioned. “Notably, the multi-task loss perform can also be straightforward to implement in a contemporary deep studying library (comparable to Pytorch) and can be utilized for jersey quantity recognition in different sports activities comparable to soccer.”
Sooner or later, the neural community developed by this group of researchers might assist to routinely determine jersey numbers in sports activities movies sooner and extra effectively. As well as, Vats and his colleagues compiled a brand new dataset containing 54,251 annotated photos of NHL gamers and their jersey numbers that could possibly be used to coach different methods for jersey quantity and participant recognition.
Of their subsequent research, the researchers plan to enhance their jersey quantity and participant identification system additional. For example, they wish to devise a neural community that additionally takes into consideration the situation of ice hockey gamers on the ice rink when attempting to find out their identities.
“The present research doesn’t take temporal context under consideration, so our future work will goal to enhance participant identification through the use of temporal video information for inferring the jersey quantity from broadcast clips,” Vats mentioned. “This may be performed by a temporal convolutional community that may instantly work on movies. The proposed multi-task loss perform will likely be included within the temporal community.”
Scientist develops a picture recognition algorithm that works 40% sooner than analogs
Multi-task studying for jersey quantity recognition in ice hockey. arXiv:2108.07848 [cs.CV]. arxiv.org/abs/2108.07848
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A multi-task studying community to acknowledge the numbers on jerseys of sports activities group gamers (2021, September 13)
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