1. A method of determining a correct rendering of a candidate entity, the method comprising: identifying, by one or more processors, a first combined image including an image of a reference entity, wherein the reference entity is bound by a first grid including one or more grid cells; identifying a reference pattern for the reference entity in accordance with filled, partially filled, and empty grid cell content representing the reference entity within the first grid; rendering a second combined image including an image of a candidate entity on a display coupled to a device, wherein the candidate entity is bound by a second grid including one or more grid cells; identifying a candidate pattern for the candidate entity in accordance with filled, partially filled, and empty grid cell content representing the candidate entity within the second grid; mapping corresponding grid cell patterns of the reference and candidate entities; determining a variance measurement between the mapped grid cell patterns of the reference and candidate entities; and determining, based on the variance measurement, whether the candidate entity is a correct rendering in accordance with the reference entity.