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Supervised learning techniques require large quantities of high-quality annotations as labels. For tasks like segmentation, the time and cost of creating annotations are often higher than tasks like classification. To overcome these limitations, one low-cost option is to make use of lower quality annotations collected in large quantities, i.e using weakly supervised learning.
In this article, we’re going to focus on applying WSL techniques to image-based data, to be precise, WSL for object Localization.
Object localization refers to identifying the location of one or more objects in an image and drawing a bounding box around their extent. Object detection combines the localization of an image with the classification of one or more objects in an image.
Object localization locates the presence of objects in an image and highlights their location with a bounding box.
Some top-performing DL models for object detection:
Standard Supervised object detection Vs. Weakly-Supervised Approach
Now, we can use a simple thresholding method to segment the CAM and obtain a bounding box. Firstly, regions in the CAM whose value is above 20% of the max-value of the CAM are used to create a segmentation map. Then, a bounding box is drawn to tightly encompass the largest connected component in the segmentation map.
To read more on WSOL, the following are some papers based on it:
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