Short answer: Self-Esteem Movement
To find the opposite of Total Depravity, we would have to find a doctrine that presents man as ultimately and only ever good and worthy in his identity. By definition, I don't think you would ever find this extreme within the Christian church, as any doctrine that would present man as only ever good would reject the need for any level of atonement, and would thus present guilt and shortcoming as nothing more than an illusion.
In other words, any doctrine that believes that something is required to commune with God, necessitates, by definition, the belief that something is lacking in either the means or the end goal of communion with God. Either you're missing the means to commune, or you're missing the communion itself.
Therefore, according to the opposite of Total Depravity, we already have communion with God.
The most common way to achieve this doctrine is to claim the deity of the self, and raise the self up to the divine level.
Whitney Houston put it well when she sang the following:
I found the greatest love of all
Inside of me
The greatest love of all
Is easy to achieve
Learning to love yourself
It is the greatest love of all
So we have this belief where loving one's self is the greatest love of all. I believe this doctrine is the opposite of Total Depravity. Ironically, it's this doctrine that to love ourselves is the greatest love that most who believe in Total Depravity would point out as being the very paragon of fallenness.
For an official name, I think it would be called the "self-esteem movement".
The Self-Esteem Movement is any movement that seeks to elevate the position, worth and goodness of the individual person above and beyond all else, not simply in the self's action, but in the self's identity. It's like my 6th grade physical education teacher who would say that there are no bad kids, only kids who do bad things. This statement affirms an identity of goodness while denying all evidence to the contrary.
Total Depravity, by contrast, would say that there are ever only bad kids, and this is why they do bad things. They're simply acting out their true identities.
There is no Biblical support for such a doctrine as the self-esteem movement. I believe that God makes it extremely clear that we are fallen and depraved (Romans 1-3), and that we are in need of rescue. Nevertheless, this hasn't stopped some religious institutions arising from the Christian tradition (I hesitate to call them churches), from incorporating the self-esteem movement within their belief systems. Those institutions typically have as their chief mark, self-actualization, and not the leper's cry of Kyrie Eleison (Lord have mercy!).
Just to be sure that I'm not called out as being contradictory in this last paragraph pointing out that some "churches" have indeed incorporated this belief, typically those institutions focus on assuring followers not that they have a need for salvation, but that they have somehow bought into the illusion that they're not good enough. So the bulk of the time is spent on bolstering the follower's belief that he or she is, indeed, good enough, and is simply ignorant of his or her overall worth. Thus, the goal is to lead the follower to recognize his or her own worth (not the worth of Christ necessarily), and by this, he or she will find salvation. I don't believe these institutions ought to be called "churches" at all.