Abstract: Disclosed is a method of producing lithium sulfide (Li2S) without using hydrogen sulfide (H2S) gas. Particularly, the method of producing lithium sulfide (Li2S) includes preparing a starting material including a metal oxide by subjecting a mixed powder including an inorganic compound containing lithium and oxygen, a metal reducing agent, and sulfur (S) to synthesis reaction using mechanical force, preparing a mixed solution by mixing the starting material and a solvent, and obtaining a lithium sulfide (Li2S) powder by removing the metal oxide from the mixed solution and then performing drying.

Abstract: A logo detection module includes a preprocessing unit extracts partial image data corresponding to a predetermined logo detection window region from image data, and acquire gray values based on RGB pixel values of a plurality of pixels included in the extracted partial image data, a logo template generation unit calculates a cumulative gray average value for each pixel based on the gray values of the plurality of pixels acquired using first partial image data, determine a logo pixel based on the calculated cumulative gray average value for each pixel, and generate a logo map including the logo pixel, and a logo compensation unit matches the plurality of pixels included in second partial image data extracted from second image data input after the logo map is generated and the logo pixels included in the logo map to calculate a matching rate, and determine logo compensation based on the calculated matching rate.