Sample imbalance - entry 0

The term

ground truth

 

bbox

In target detection , You usually use bounding boxes （bounding box） namely bbox, To describe the spatial location of the object . The bounding box is rectangular , From the top left corner and the bottom right corner of the rectangle 𝑥 and 𝑦 Coordinates determine . Another common boundary box representation is the center of the boundary box (𝑥,𝑦) Axis coordinates and the width and height of the box

IOU

ground truth

The standard answer , Correct label manually

postive / negative / easy / hard example

  In the task of identifying cats

• The cat is positive, Others are negative
• It is easy to be mistaken for a cat hard poitive（ notes , Cat ears are not cats ）, It is easy to be misjudged as others hard negative

You can see that most of the pictures are easy negative, Other things that are not easy to misjudge