EXHIBIT 99.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Shaw Hong, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of OmniVision Technologies, Inc. on Form 10-Q for the quarter ended October 31, 2002 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents in all material respects the financial condition and results of operations of OmniVision Technologies, Inc. Dated: December 13, 2002 By: /s/ SHAW HONG ----------------------------------- Shaw Hong Chief Executive Officer, President and Director (Principal Executive Officer) I, H. Gene McCown, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of OmniVision Technologies, Inc. on Form 10-Q for the quarter ended October 31, 2002 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report on Form 10-Q fairly presents in all material respects the financial condition and results of operations of OmniVision Technologies, Inc. Dated: December 13, 2002 By: /s/ H. GENE MCCOWN ----------------------------------- H. Gene McCown Vice President of Finance and Chief Financial Officer (Principal Financial and Accounting Officer) 1