Eric Fullerton, the chief executive of Hauppauge-based Vicon Industries Inc., is resigning effective Friday after less than two years in the post, the maker of video surveillance systems disclosed in a government filing Thursday.

Fullerton also is stepping down from his role as a director of the company.

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On Tuesday, Vicon’s board of directors named John Badke as the interim chief executive, the filing said. Badke, 57, who has been senior vice president, finance, since May 2004 and chief financial officer since December 1999, will continue in those roles.

In September 2014, Vicon’s board of directors named Fullerton to succeed the retiring Kenneth Darby as chief executive. Fullerton, who had served as chief sales and marketing officer of Denmark-based Milestone Systems A/S, was charged with returning Vicon to prominence in video security and surveillance, and integrating merger partner iQinVision Inc., according to a company statement at the time.

Vicon and iQinVision, a privately held maker of high performance megapixel cameras based in San Juan Capistrano, California, announced a merger agreement in March 2014. The all-stock deal gave iQinVision shareholders about half the combined company.

In the quarter ended March 31, Vicon reported a 22 percent decrease in net sales to $8 million as its net loss widened to $7.7 million from $1.8 million in the same quarter in 2015. In the past 12 months, the company’s stock has declined almost 40 percent.

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Shares of Vicon slipped 0.5 percent to close at 82 cents Thursday.