傳統機密影像分享機制所產生的分享影像的外觀雜亂無章、難以辨識，導致該分享影像無法有效管理、友善度較低。標籤式機密影像分享機制在分享影像加上額外的識別標籤，利用摺疊單張分享影像的方式，將標籤影像還原，可讓使用者有效管理多張分享影像，大幅增加分享影像的友善程度。前人提出的方法雖可增加分享影像的友善度，但可能會因此而降低還原機密影像的品質。本研究改進前人的方法，透過實驗驗證本研究所提的方法能有效改善標籤影像的還原品質。

The appearance of shares encoded by the traditional visual cryptography is meaningless, and it’s difficult to distinguish. That causes the shares can’t be managed efficiently, and isn’t friendly to the users. Tagged visual cryptography (TVC) supplements the extra tag images in the shares, and decodes the tag images by folding up a single tag share. TVC provides user with managing the various shares efficiently, and greatly increases the user-friendly of the shares. Although the previous method can improve user-friendly of the shares, the quality of revealing the secret image might decrease. Therefore, this research achieves the better quality of revealing the tag image by improving the previous method, and we analyze the difference between this research and the previous method.