Fig. 1. Detection diagram of R-FCN

Fig. 2. Separable convolution

Fig. 3. Incomplete information marked by anchors

Fig. 4. Change of translation and scaling

Fig. 5. Comparison of iterations accuracy changes^[11]. (a)FPN iterations accuracy changes; (b)R-CNN iterations accuracy changes

Fig. 6. Comparison of pooling. (a) ROI pooling; (b) precise ROI pooling

Fig. 7. Non-maximum suppression

Fig. 8. Lack of localization confidence of NMS

Fig. 9. Prediction of IOU

Fig. 10. Flow chart of LOF-FCN

Fig. 11. Comparison of fire missed detection rate

Fig. 12. Comparison of fire detection accuracy

Fig. 13. Experimental video. (a) Video 1; (b) video 2; (c) video 3; (d) video 4; (e) video 5; (f) video 6