慶應義塾大学

慶應義塾大学青木義満研究室

慶應義塾大学青木義満研究室

japanese

Visual Attribute Manipulation Using Natural Language Commands

In this paper, a novel setting is tackled in which a neural network generates object images with transferred attributes, by conditioning on natural language. Conventional methods for object image transformation have been known to bridge the gap between visual features by using an intermediate space of visual attributes. This paper builds on this approach and finds an algorithm to precisely extract information from natural language commands, completing this image translation model. The effectiveness of our information extraction model is experimented, with additional tests to see if the change in visual attributes is correctly seen in the image.

Graph Convolutional Neural Networks on superpixels for segmentation

A disadvantage of image domain segmentation using CNN is that spatial information is lost due to down-sampling by the pooling layer, and domain segmentation accuracy in the vicinity of object contours is reduced. Therefore, we proposed a graph convolution on superpixels as a different approach to prevent loss of information by pooling. In addition, we proposed a Dilated Graph Convolution, which extends the receptive field more effectively as an extension of the graph convolution. In a domain segmentation task using the HKU-IS data set, the proposed method outperformed a conventional CNN with the same configuration.

Super pixel pooling for segmentation

Saliency map generation in image discrimination using a CNN classifier

In general, when an image is input to a CNN and a specific output obtained, it is difficult to explain why such an output was obtained. In this study, we propose a saliency map generation method given by applying a Generative Adversarial Networks framework. In this system, learning takes place while two neural networks are made to compete. The first network learns to perform image identification. The second network learns to create an image that – if an image is input to the first network and can be successfully identified – is similar to this image but outputs an incorrect result when input into to the first network. For the second network to efficiently generate such an image, it suffices for the network to generate an image in which an image area important in the image identification of the first network is significantly changed. Such learning can be regarded as a saliency map, since it is possible to explicitly output an image area important in image identification.

Saliency map generation for image classification task by using GAN

Simultaneous execution of color adjustment and image completion by GAN

In this study, we propose a method of image completion while performing color adjustment in consideration of context in order to solve the problem of natural paste synthesis by color adjustment and image completion. In order to make the inserted object image explicitly appear in the completion area, we use CNN and Generic Adversarial Networks (GAN) for completion in consideration of context, and extract features related to the context from the entire background image. Furthermore, color adjustment taking context into consideration is carried out using the context features not only for image completion but also for color adjustment. In this way, a network is realized that simultaneously solves the problems of color adjustment and image completion.

Results of color adjustment and image completion by GAN

Image Completion of 360-Degree Images by cGAN

This work proposes the novel problem setting that by using a known area from the 360-degree image as an input, the remainder of the image can be completed with the GANs. To do so, we propose the approach of two-stage generation using network architecture with series-parallel dilated convolution layers. Moreover, we present how to rearrange images for data augmentation, simplify the problem, and make inputs for training the 2nd stage generator. Our experiments show that these methods generate the distortion seen in 360-degree images in the outlines of buildings and roads, and their boundaries are clearer than those of baseline methods. Furthermore, we discuss and clarify the difficulty of our proposed problem. Our work is the first step towards GANs predicting an unseen area within a 360-degree space.

Image control after imaging by epsilon photography reconstruction using compression sensing

Conventionally, the photographer must select many parameters on the camera at the time of photographing. Light field imaging has enabled image control after shooting with respect to focus position and shooting viewpoint, but resolution is low, specialist hardware is required, and a completely flexible restoration of the focus position and aperture size is not possible. This study relates to technology to restore images taken with various parameters from ten images shot in succession using conventional cameras with parameters such as focus position, aperture size, exposure time and ISO changed. For example, we completely reconstruct the high dynamic range focus-aperture stack using consecutively shot images with pre-set parameters as the input.

Idea of Epsilon Photography

Aoki Media Sensing Lab.

Keio University
Dept. of Electrical Engineering, Faculty of Science and Technology

3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa

223-8522, Japan

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