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Among those surveyed, previous best-actress Oscar winner Sandra Bullock is the favorite in that category again for her role as an astronaut in "Gravity," with 24 percent saying she will take home the prize. Amy Adams garnered 11 percent support for her portrayal of a 1970s con artist in "American Hustle."

Leonardo DiCaprio's depiction of disgraced stock trader Jordan Belfort in "The Wolf of Wall Street" should earn him his long-awaited best-actor Oscar in his third try for the prize, according to 17 percent of those surveyed. Some 11 percent favored "Dallas Buyers Club" star Matthew McConaughey to win the award.

Steve McQueen, the director of "12 Years a Slave," had the most support at 14 percent to win best director, and Scorsese finished second with 11 percent. If McQueen wins, he would be the first black director to do so.

Alfonso Cuaron, who has won nearly all of the directing awards this season for "Gravity" and is the pundits' favorite to win the Oscar, was third with 7 percent.

Fifty-two percent said they were unsure who should win the best actor and best actress awards.

DeGeneres, the ceremony's host, scored the approval of 60 percent of respondents. Of those who supported the choice, 34 percent said they strongly approved of the daytime talk show host leading the show for a second time.

Seventeen percent said DeGeneres was their top choice to host the Oscars. Frequent host Billy Crystal, Golden Globe co-host Tina Fey, and comedians Eddie Murphy and Jimmy Fallon all came in second with 8 percent.

Last year's host, "Family Guy" creator Seth MacFarlane, garnered 3 percent of support from respondents as their top choice.

The precision of Reuters/Ipsos online polls is measured using a credibility interval. In this case, the poll has a credibility interval of plus or minus 3 percentage points.