写真測量とリモートセンシング
Online ISSN : 1883-9061
Print ISSN : 0285-5844
ISSN-L : 0285-5844
最新号
選択された号の論文の13件中1~13を表示しています
巻頭言
カメラアイ
小特集「災害対応に役立つ技術・センサ(その2)」
原著論文
  • 岩本 達真, 田中 成典, 亀田 友陽
    2026 年65 巻2 号 p. 83-100
    発行日: 2026/05/11
    公開日: 2026/05/01
    ジャーナル 認証あり

    In marathon competitions, the time taken by runners wearing RFID tags to pass designated points is measured, and this information is used to provide viewers with commentary on the race progress during marathon broadcasts, as well as lap times and estimated finishing times. However, it is difficult to measure each player's performance information, such as speed, pitch, and stride length, and this information has not yet been provided. In collaboration with Kansai Television Co. Ltd., the authors have developed technology using deep learning to automatically extract athletes from live television footage and estimate their running motion, i.e., their pitch and stride length. Therefore, we report the detection results obtained from the analysis of the OSAKA Women's Marathon held in 2024 and 2025, and discuss methods for dealing with occlusion between runners.

  • 田隅 大路, 橋本 直之, 松川 和嗣, 坂野 新太, 村井 亮介
    2026 年65 巻2 号 p. 101-112
    発行日: 2026/05/11
    公開日: 2026/05/01
    ジャーナル 認証あり

    The decline in cow conception rates in the Japanese cattle industry-from 68.7% in 1989 to 52.0% in 2022-poses a critical challenge to productivity. Major factors contributing to this decline include missed estrus detection due to labor shortages and the obscuration of estrus behaviors by environmental stressors such as heat stress. Conventional object detection methods are limited to capturing broad behavioral categories, such as mounting or physical contact, and do not account for subtle behavioral nuances, including mounting direction or vulva sniffing. To address these challenges, this study proposes a non-invasive method for fine-grained behavioral analysis based on fixed surveillance cameras and AI-driven pose estimation. By integrating YOLOv9 and DeepLabCut, we conducted detailed behavioral detection of mounting direction and specific contact points in Tosa Akaushi. The results indicated that all types of mounting behavior showed significant increases only on the day of estrus, suggesting that mounting behavior alone is insufficient for detecting potential signs of proestrus. In contrast, nose and forehead contact behaviors exhibited increasing trends on Days -3 and -1 relative to baseline levels, suggesting that these behaviors may serve as potential indicators of the proestrus phase. These findings suggest that detailed behavior quantification based on pose estimation may improve the identification of both proestrus and the day of estrus, thereby contributing to reproductive management for timely insemination.

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