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Toshiba develops AI that can measure the size of remote objects with only multiple photos taken with a zoom lens and a monocular camera | Today Nation News

TechnologyToshiba develops AI that can measure the size of...

On November 22, Toshiba introduced a technology that can measure the size of a remote object in three dimensions from only photographs taken with a zoom lens and a general monocular camera (single-lens reflex camera) under different conditions such as the shooting position. Announced that it was developed for the first time in the world. In infrastructure inspections, measurement is possible without approaching dangerous places such as high places and slopes.

The average age of domestic infrastructure equipment exceeds 35 years, and the deterioration of infrastructure such as roads, bridges, and tunnels has become a problem, and urgent measures are required. Accurate size measurement is important. However, it is difficult to measure visually in dangerous places such as high places and slopes. Therefore, Toshiba has developed an AI technology that allows you to easily measure the size of a photograph taken with a zoom lens from a distance without approaching a dangerous place. By combining relative depth information calculated from multiple photographs (multi-viewpoint images) taken from different positions and image blur information, and solving an optimization problem with scale information and focal length as unknown parameters. , The absolute value of the size can be known only from the captured image.

An app that can measure the size from the image of the camera is also installed in smartphones. This requires a gyro sensor that gives an absolute value to the relative value obtained from the multi-viewpoint image, and an AI model that has been trained in advance. Therefore, the accuracy drops when the distance exceeds the learning range.

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The system developed by Toshiba was able to measure the size of cracks 7 m away with high accuracy. When the size of the object 5 to 7 m away was measured at 11 outdoor locations, the size error was suppressed to 3.8%. This accuracy was confirmed by a numerical simulation based on the concrete crack repair guideline established by the Japan Concrete Engineering Association, “it is possible to determine the need for high-precision repair.” In addition, we were able to measure the absolute value of crack sizes of 2 mm or less.

Toshiba says that this technology can be applied not only to infrastructure inspections, but also to fields where size measurement is performed with cameras, such as manufacturing, logistics, and medical care. In the future, we will continue to carry out demonstration experiments using various cameras and lenses, aiming for early commercialization.Toshiba develops AI that can measure the size of a remote object only with photos taken with a zoom lens and a monocular camera

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