Abstract: The present invention embodies a technique, referred to as Secure QR Codes, which not only provides aesthetically enhanced QR codes but also allows for security. It can embed a standard black and white QR code, referred to as a public QR code, and a secret QR code, both into a secure QR code. The secure QR code produced is composed of colored cells. The public black and white QR code must first be, either aesthetically enhanced into an enhanced colored QR code, or transformed into a colored QR code with cells of uniform color obtained by transforming each of the black and white cells of the public QR code into cells that takes a color from a subset of possible colors, such that the luminance of each colored cell approximates accurately the black or white luminance values of the public QR code.

Abstract: Disclosed are a method and apparatus for embedding a graphic image representation into a two dimensional matrix code by modifying the characteristic values of individual pixels in the image according the values of a provided two dimensional matrix code image. The modified character pixel values are determined using an optimization procedure that minimizes a visual distortion with respect to the original graphic image representation while maintaining the value of a probability of error model below a specified limit.

Abstract: Disclosed are a method and apparatus for embedding a graphic representation into a two dimensional matrix code by modifying the luminance of individual pixels in the image according the values of a provided QR code image. The modified luminance values are determined by an optimization procedure which minimizes a visual distortion metric with respect to the original graphic representation while maintaining the value of a model for the probability of decoding and detection error below a specified limit.

Abstract: The present invention embodies a technique, referred to as Secure QR Codes, which not only provides aesthetically enhanced QR codes but also allows for security. It can embed a standard black and white QR code, referred to as a public QR code, and a secret QR code, both into a secure QR code. The secure QR code produced is composed of colored cells. The public black and white QR code must first be, either aesthetically enhanced into an enhanced colored QR code, or transformed into a colored QR code with cells of uniform color obtained by transforming each of the black and white cells of the public QR code into cells that takes a color from a subset of possible colors, such that the luminance of each colored cell approximates accurately the black or white luminance values of the public QR code.

Abstract: The present invention embodies a technique, referred to as Secure QR Codes, which not only provides aesthetically enhanced QR codes but also allows for security. It can embed a standard black and white QR code, referred to as a public QR code, and a secret QR code, both into a secure QR code. The secure QR code produced is composed of colored cells. The public black and white QR code must first be, either aesthetically enhanced into an enhanced colored QR code, or transformed into a colored QR code with cells of uniform color obtained by transforming each of the black and white cells of the public QR code into cells that takes a color from a subset of possible colors, such that the luminance of each colored cell approximates accurately the black or white luminance values of the public QR code.

Abstract: The present invention embodies a technique to embed a graphic representation and/or a concealed message such as but not limited to two dimensional codes such as quick response (QR) code matrices, fingerprints, coded fingerprint representations, iris imagery, iris coded representation, biometric hashes, palm print or portraits into a QR matrix code. In the case where biometric data such as finger print representation, iris coded representation or biometric hashes are encoded into the embedding, suitable binary representation of those patterns are generated before encoding. These concealed messages can be further encrypted using any cryptographic method such as public or private key or other suitable encrypting mechanisms adapted to the concealed message.

Abstract: Disclosed are a method and apparatus for embedding a graphic image representation into a two dimensional matrix code by modifying the characteristic values of individual pixels in the image according the values of a provided two dimensional matrix code image. The modified character pixel values are determined using an optimization procedure that minimizes a visual distortion with respect to the original graphic image representation while maintaining the value of a probability of error model below a specified limit.

Abstract: The present invention embodies a technique to embed a graphic representation and/or a concealed message such as but not limited to two dimensional codes such as quick response (QR) code matrices, fingerprints, coded fingerprint representations, iris imagery, iris coded representation, biometric hashes, palm print or portraits into a QR matrix code. In the case where biometric data such as finger print representation, iris coded representation or biometric hashes are encoded into the embedding, suitable binary representation of those patterns are generated before encoding. These concealed messages can be further encrypted using any cryptographic method such as public or private key or other suitable encrypting mechanisms adapted to the concealed message.

Abstract: The present invention embodies a technique, referred to as Secure QR Codes, which not only provides aesthetically enhanced QR codes but also allows for security. It can embed a standard black and white QR code, referred to as a public QR code, and a secret QR code, both into a secure QR code. The secure QR code produced is composed of colored cells. The public black and white QR code must first be, either aesthetically enhanced into an enhanced colored QR code, or transformed into a colored QR code with cells of uniform color obtained by transforming each of the black and white cells of the public QR code into cells that takes a color from a subset of possible colors, such that the luminance of each colored cell approximates accurately the black or white luminance values of the public QR code.