9. A system, comprising: one or more processors; one or more modules stored in the memory and executable by the one or more processors to: display an image in a first display area, the image having a missing object and an area of the image with the missing object filled in with image inpainting; display a set of candidate objects in a second display area, the set of candidate objects including the missing object distributed among other candidate objects, display the image with a candidate object selected from the set of candidate objects in the first display area in response to a drag and drop of the candidate object into the first display area, evaluate the candidate object with respect to the image based on visual recognition; determine that the candidate object is selected by a bot in response to identifying the candidate object as not belonging to the image; and determine that the candidate object is selected by a human in response to identifying the candidate object as the missing object that belongs in the image.
9. A system, comprising: one or more processors; one or more modules stored in the memory and executable by the one or more processors to: display an image in a first display area, the image having a missing object and an area of the image with the missing object filled in with image inpainting; display a set of candidate objects in a second display area, the set of candidate objects including the missing object distributed among other candidate objects, display the image with a candidate object selected from the set of candidate objects in the first display area in response to a drag and drop of the candidate object into the first display area, evaluate the candidate object with respect to the image based on visual recognition; determine that the candidate object is selected by a bot in response to identifying the candidate object as not belonging to the image; and determine that the candidate object is selected by a human in response to identifying the candidate object as the missing object that belongs in the image. 14. The system of claim 9 , wherein the set of candidate objects share one or more low level features, the low level features including smoothness, texture, and color difference of neighboring segments.