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一種利用區塊墨點數調變的半色調資料隱寫編碼系統，其包括：一半色調轉換模組，其根據一正方形臨界值矩陣，將一灰階影像轉換成一具有多個半色調單元的半色調影像，及一編碼模組，其將該等半色調單元劃分成複數個可編碼區塊，每一可編碼區塊由相鄰的4個半色調單元組成，且該編碼模組包含對應16種編碼資料的16個編碼規則，以根據其中一種編碼資料使用應對的一編碼規則來調變該可編碼區塊中每一個半色調單元的墨點數，使每一半色調單元的墨點數加1、減1或維持不變，而將該編碼資料隱含在該可編碼區塊中，而使該半色調影像成為一編碼後半色調影像。
A method for generating a data-bearing image is implemented by an encoding system including a halftoning module and an encoding module that stores encoding rules associated with respective codes. In the method, the halftoning module converts a grayscale image into a halftone image having a plurality of image cells each consisting of a plurality of dots, at least one of which is a first-tone dot and each of the rest of which is a second-tone dot. Afterward, the encoding module generates a data-bearing halftone image encoded with at least one of the codes by maintaining or changing the number of the first-tone dots in one of the image cells based on one of the encoding rules associated with the at least one of the codes.

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