Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13007-022-00839-5/MediaObjects/13007_2022_839_Fig5_HTML.png)
Examples of Grad-CAM (ResNet-101) heatmaps for 10 sample chalky seed images (5 on the left side and 5 on the right side). For each seed, heatmaps corresponding to the following four layers are shown: (1) ResNet101 layer1_2_conv2; (2) ResNet101 layer2_0_conv2; (3) ResNet101 layer3_1_conv2; (4) ResNet101 layer4_1_conv3. The IoU values obtained for three thresholds T (20%, 40% and 60%, respectively) are shown under each heatmap