This is sort of a humorous concept, but perhaps no different than trying to recognize the face of a person with murderous intent.
A stock chart would be the optical image.
Actually a chart would be a 1-dimensional image when compared with a full 2-dimensional picture of a tank or whatever.
What is interesting from this perspective is the image pre-processing that would be applied to the stock chart - it would be different than what is typically done with time history data.
Just wandering outside the box...