Class: 623 (Letter Opener), Feature: 1361

MTurk Worker Annotations

We now show the responses from five crowdworkers used to annotate this class-feature pair as core or spurious. Workers first denote if the focus of the image is on the main object (core), or a separate or background object (spurious). They also mark their confidence on a scale of 1 to 5, and provide written explanations for their annotation.



Main Focus	Confidence	Explanation
Main Object	4	Focus is in the middle of letter opener where the handle and blade connect
Main Object	4	In my opinion the red regions are always focusing on part (body) of the main object (paper knife). there is a lot overlap in between a red region and the background, but i think the main focus is on the body of the main object in all 5 pictures. there are no other objects shown in any of the pictures.
Background	5	Focus is on the background of the letter opener, paper knife, paperknife
Main Object	5	Focus is on central part of paper knife
Main Object	5	The focus of the red region in the highlighted visual attributes is on letter opener.


Votes for core: 4, Votes for spurious: 1. Feature is thus annotated as core for the class.