Automation of Product Display Using Pose Estimation Based on Height Direction Estimation

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<p>The development of product display robots in retail stores is progressing as an application of industrial robots. Pose estimation is necessary to enable robots to display products. PYNet is a high-accuracy pose estimation method for the poses of simple-shaped objects such as triangles, rectangles, and cylinders, which are common in retail stores. PYNet improves pose estimation accuracy by first estimating the object’s ground face. However, simple-shaped objects have symmetrical shapes, making it difficult to estimate poses that are inverted by 180°. To solve this problem, we focused on the upper part of the product, which often contains more information, such as logos. We developed a new method, PYNet-zmap, by enabling PYNet to recognize the height direction, defined as the direction from the bottom to the top of the product. Recognizing the height direction suppresses the 180° inversion in pose estimation and facilitates automatic product display. In pose estimation experiments using public 3D object data, PYNet-zmap achieved a correct rate of 79.2% within a 30° error margin, an improvement of 2.8 points compared with the conventional PYNet. We also implemented PYNet-zmap on a 6-axis robot arm and conducted product display experiments. As a result, 82.5% of the products were displayed correctly, an improvement of 8.9 points compared to using PYNet for pose estimation.</p>

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