Hume and Plato

While reading Hume, I began to wonder if Hume’s objective standards are comparable to Plato’s world of forms. Plato, as we have previously learned, proposed the existence of a world of forms beyond the reach of human concept. In the world of forms existed the forms of all objects which people build (or in this case ‘imitates’). Whenever someone creates a chair or a bed, they are trying to imitate one of these perfect, beautiful forms, but can never succeed. Plato wished to omit emotion from his ideal state so that people will be better able to become closer to this world of forms through reason. He obviously believed emotion would distort people’s perception of the worlds of forms.
Hume, similarly, believes there are objective standards which everyone is aware of, but because of defects, our perception of these standards is distorted, creating subjective opinion. According to Hume, objectivity can only be attained through “a perfect serenity of mind, a recollection of thought, a due attention to the object” (Wartenberg 44). Basically, objectivity can be attained through reason. So, both philosophers have proposes a series of—or world of—perfect, object beauty which is beyond the comprehension of humanity and can best be attained by reason.
However, further reading has shown me the two philosophies are not compatible. Plato’s world of forms exists outside of the observer, while for Hume the objective standards are still existent only in the observer’s perception.
Are Plato’s world of forms and Hume’s objective standards compatible?