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Overview: The object recognition of RGB image is easily affected by the external environment, and the recognition accuracy has reached the bottleneck, which is difficult to meet the requirements of practical application. In recent years, the recognition method combined with depth image has become a new way to improve the accuracy of object recognition. The RGB image contains the color and texture features of the object, and the depth image contains the geometric features of the object and has illumination invariance. The fusion of RGB features and depth features can effectively improve the recognition accuracy. In order to make full use of the potential feature information of RGB-D image, and overcome the problem that the existing literature pays attention to the recognition results of single-mode and ignores the complementary advantages of RGB image and depth image, an RGB-D object recognition algorithm (Re-CRNN) based on improved double stream convolution recursive neural network is proposed. The depth image is encoded by calculating the surface normal. The depth image of a single channel is encoded into three channels. The transfer learning method is used to train the original image to generate the same level features as the RGB image. The backbone network is based on the double stream convolution neural network with improved residual learning. Residual learning is introduced to optimize the network structure and reduce the complexity of the model. The parameters of each data stream network are the same. The RGB image and depth image are trained respectively to extract the high-order features of RGB image and depth image. A feature fusion unit is added at the top layer of the network. The extracted high-level features of RGB image and depth image are fused across channels and mapped to a public space. Next, the fused features are further extracted by using a recursive neural network to generate a new feature sequence, which is classified by the softmax classifier. Finally, experiments are carried out on the standard RGB-D data set to compare the effects of different extrusion functions on the experimental results, as well as the fusion results of different convolution layers. The experimental results show that the recognition accuracy of RGB-D image is higher than that of RGB image, and the fusion of RGB features and depth features can further improve the accuracy of object recognition. The RGB-D object recognition algorithm proposed in this paper has achieved the best recognition results. The recognition accuracy rate on the RGB-D data set reaches 94.1%, which is obviously improved compared with the existing methods.
Depth image encoding. (a) RGB image; (b) Original depth image; (c) Encoded depth image
Input image preprocessing. (a) Original image; (b) Direct zoom image; (c) Short edge extended image
Network model
Feature fusion unit
RGB-D object dataset
RGB-D scene dataset
Influence of different extrusion functions on the network
Level output contrast
Confusion matrix on RGB-D object dataset
Examples of misclassification in RGB-D object dataset
Confusion matrix on RGB-D sence dataset
Examples of misclassification in RGB-D sence dataset