NEW YORK ( TheStreet) -- CHANGE IN RATINGS Omnivision ( OVTI) downgraded at Oppenheimer from Outperform to Perform, Oppenheimer said. Company is facing increased competition, which could limit potential gross margin expansion. Select Comfort ( SCSS) upgraded at Keybanc from Hold to Buy, Keybanc said. $30 price target. Fundamentals appear to be improving. SPLK) upgraded at FBR from Market Perform to Outperform, FBR Capital Markets said. $61 price target. Strong product cycle and healthy secular trends can translate to larger deal sizes. Staples ( SPLS) downgraded at JP Morgan to Neutral from Overweight, JP Morgan said. $15 price target. Secular pressures appear to have accelerated.