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Fujitsu Technology Enables Fast Image Recognition When Searching Into a Massive Volume of Images

Fujitsu Technology Enables Fast Image Recognition When Searching Into a Massive Volume of Images

Enterprise & IT Feb 2,2016 0

Fujitsu Laboratories has developed technology that can be installed on a server in order to search at high speed through an enormous archive to find even partial matches of a designated still image. Fujitsu says that the technology dramatically improves server performance by configuring an accelerator that performs the necessary processing of image searches on an FPGA (Field-Programmable Gate Array) and efficiently linking it with software running on the CPU, creating a high-speed image search function.

Using a prototype server, Fujitsu Laboratories confirmed that it could search through a database of over 10,000 images and retrieve matches of any desired portion in about one second.

With this technology, companies and other organizations will be able to search through the large volume of image data they have stored and instantaneously find and reuse target images, enabling on-site work to be carried out more efficiently.

A server equipped with this technology will be exhibited at the Fujitsu North America Technology Forum 2016, which is scheduled to open on February 16 in Santa Clara, California.

Development Background

When a person searches for an image, it is often prompted by a vague recollection or an associated image. There is a technology for finding images based on matches with a part of the query image itself, called partial-image search. This can be used to find similar or related images, or with new hints to spark the user's memory through associations, to more intuitively search for the target image. But partial-image searching requires massive computing resources, as comparisons of partial images need to be made between all the images. On a general purpose server, finding a target image from among 10,000 images can take over one minute. Search speed can be improved by using multiple servers in parallel or with distributed processing, but there are drawbacks in the form of great costs for energy consumption and equipment.

Fujitsu's new technology accelerates search speeds by offloading the computing elements able to perform massive parallel processing as part of the processes that conventionally are done on a CPU to an FPGA, and furthermore, by optimizing the process scheduling, with a focus on data transfers, so that these processing units could be run in parallel at high utilization rates.

This technology is based on the "domain-specific server" approach, which improves server performance using a hardware configuration optimized for this particular application domain along with software optimized for key functions.

To achieve high performance using the FPGA, the keys are to densely pack processing units on the FPGA that efficiently executes complex processes, and to operate the processing units so that they are kept supplied with data and not left idle.

Fujitsu analyzed the partial-image search algorithm in detail and shifted the feature extraction process and matching process from the overall search flow, and relocated these processes to the FPGA. Because the FPGA has a flexible design in which its processing units and parallelization can be organized to fit the process characteristics in a way that CPUs and GPUs cannot, compact and efficient processing units were designed for each of these two processes and incorporated at high density and with a high degree of parallelization into the FPGA. Efficient coordination between the high-performance FPGA processing units and the software running on the CPU results in high-speed partial-image searches.

In image processing, especially when it involves large volumes of image data, it takes time to read data from memory, where it is temporarily stored. So it is possible to shorten read latency by reading in advance the next required data currently being processed. But the next piece of data to work on may change depending on the results of the current process, negating the benefit of reading ahead. With a high degree of parallelization, and the simultaneous use of a large volume of data, the penalty for a wasted read-ahead is considerable. Fujitsu Laboratories has developed a scheduling technology in which, while read-aheads are being performed, the order of processing can be switched, depending on the circumstances, and thereby avoid wasting the read operation data.

A prototype server using this newly developed technology was demonstrated to be able to search a database of over 10,000 images and finish retrieving matches of any desired portion of an image in roughly one second, performing partial-image searches over 50 times faster than on general-purpose servers. Compared to general-purpose servers with comparable performance, the prototype required less than 1/30th the electrical power and less than 1/50th the cubic volume of space as multiple general-purpose servers.

Fujitsu Laboratories plans to move ahead with development of a system using this high-speed image-search technology, with the goal of a practical implementation during fiscal 2016.



Tags: Fujitsu
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