National Taiwan Normal University

National Taipei Normal University

Hsi-Chun Wang

Chia-Tsen Sun

Yu-Mei Wang

Chun-Shien Lu

Pei-Chun Kuan

Ya-Wen Cheng

Shan-Hua Yeh

Pei-Chi Hsiao

Chi-Ming Lien

Jia-Chi Ho

Jong-Kai Lee

The present disclosure provides a QR code graphic manufacturing device, which comprises a gray-scaled adjusting module, a data-hiding module, and an error-diffusion module. The gray-scaled adjusting module is used to adjust a gray-scaled value of an original image to generate a modified gray-scaled image. The data-hiding module and the error-diffusion module are respectively used to process the modified gray-scaled image and a QR code, and to generate a QR code graphic with a better hidden effect.

QR code graphic manufacturing device and manufacturing method of the same

A method of creating a graphic Quick Response (QR) code includes a picture and first and second two-dimensional barcodes combined through a halftoning technique. The graphic QR code includes a plurality of module units, each having a plurality of sub-modules. Information dots containing first information for the first two-dimensional barcode are provided, and each of the information dots of the first two-dimensional barcode is located at a central sub-module of each of the module units. The first information is readable by a scanning device. Information dots containing second information for the second two-dimensional barcode are provided, and each of the information dots of the second two-dimensional barcode is located at one of the other sub-modules. A position of each of the information dots of the second two-dimensional barcode is capable of being located by inputting a key through a decryption program for obtaining the second information.

Graphic two-dimensional barcode and creating method thereof

A watermark and a manufacturing method therefor are provided. The watermark has a first region comprising amplitude modulation (AM) halftone dots and a second region comprising frequency modulation (FM) halftone dots, and each of the amplitude modulation halftone dots has ink portions and blank portions, each of which is located between the two ink portions in the same amplitude modulation halftone dot. The ink area percentage of the amplitude modulation halftone dots are dispersed by filling the blank portions into each of the amplitude modulation halftone dots, so that the density calibration of the amplitude modulation halftone dots and frequency modulation halftone dots can be omitted.

Watermark and manufacturing method therefor

A method of watermark with hybrid halftone dots that is suitable for a printed shadow image. The watermark patterns that are composed of amplitude modulation (AM) and frequency modulation (FM) halftone dots (their concentration has been calibrated) cannot be perceived beyond a certain distance by the human eye. This is done through outputting the density calibration chart to choose the proper density parameters, which are applied to the manufacture process of the watermark with hybrid halftone dots. The hidden patterns of a watermark need to be pre-processed first, and thereby making the image blocks of AM and FM halftone dots to be combined smoothly. The copy machine, the lenticular lens and the optical scanner can detect the hidden watermark in the printed shadow image. Each secured document possesses a different serial number to achieve the document-version control.

Method of watermark with hybrid halftone dots

Growing community of inventors

Taipei, Taiwan

Hsi-Chun Wang