摘要:
A method for processing scanned image data, executed at least in part by a computer system, obtains scanned image data, obtains a predetermined image quality profile that has one or more image quality requirement values, and generates processed image data by applying one or more image processing operations to the image data in accordance with a processing script. The method calculates image quality metrics from the processed image data and compares the calculated image quality metrics to the one or more image quality requirement values from the predetermined quality profile. Results of the image quality comparison are displayed.
摘要:
An apparatus for optically embedding hidden data in a source image, wherein the hidden data is updateable in real-time, the apparatus includes (a) optical masks bearing a data image and an encoding carrier image either or both of which may be updated in real-time; (b) optical components for convolving, the data image with the encoding carrier image to produce a spatially dispersed data image; and (c) optical beam combiner for combining the spatially dispersed data image with the source image to produce a source image containing embedded hidden data.
摘要:
A method selecting a quality parameter for use in compressing a digital image, the method comprises the steps of creating a plurality of quantizer parameter sets, each having a corresponding quality parameter; compressing the digital image with the plurality of quantizer parameter sets for providing a corresponding plurality of compressed file sizes; creating a rate-distortion curve from the plurality of quantizer parameter sets and the corresponding compressed file sizes; providing a maximum and minimum quality parameters; providing a target compressed file size; and selecting a quality parameter based on the rate distortion curve, the maximum and minimum quality parameters and the target compressed file size.
摘要:
A method for calculating a skew angle of an original image, executed at least in part on a computer system stores image data for the original image in an electronic memory, then forms an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data. A partitioned image is formed by partitioning the energy-normalized image into a number of sub-regions. A summed region is formed as a combination of image pixel data from the sub-regions. A Fourier magnitude spectrum is obtained by performing a Fourier transform on the summed region. The skew angle is calculated according to the peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles. An output signal indicates the calculated skew angle.
摘要:
A method for calculating a skew angle of an original image, executed at least in part on a computer system stores image data for the original image in an electronic memory, then forms an energy-normalized image according to the relative contrast amplitude of image features over each of a plurality of local image regions within the stored image data. A partitioned image is formed by partitioning the energy-normalized image into a number of sub-regions. A summed region is formed as a combination of image pixel data from the sub-regions. A Fourier magnitude spectrum is obtained by performing a Fourier transform on the summed region. The skew angle is calculated according to the peak value of a radial line integration function that is formed by integrating the Fourier magnitude spectrum along each of a plurality of lines of constant radial angles. An output signal indicates the calculated skew angle.
摘要:
The method and system embeds digital meta-data into an original image in such a way that the meta-data can be completely removed at a later time to allow loss less recovery of the original image. The loss less recovery of the original image allows for a digital signature of the image to be embedded in the image itself and later recovered and used to verify the authenticity of a received image.
摘要:
A method is disclosed for printing an authenticatable image having an embedded image into a receiver having a discernible physical characteristic, such that the printed image can be used to authenticate the receiver includes scanning the receiver to produce information related to the discernible physical characteristic of the receiver, and providing a carrier which includes information related to the scanned receiver discernible physical characteristic. The method also includes combining the carrier with an input image to form the authenticatable image having the embedded image, and printing the authenticatable image having the embedded image onto the receiver.
摘要:
A method of detecting an embedded message in a digital image, the embedded message being embedded in periodic blocks in the image, including the steps of: selecting a first area in the digital image; selecting a second area in the digital image; performing a correlation between the first and the second image areas; and if the correlation exceeds an predetermined threshold value at at least one pixel location, producing a signal indicating the existence of embedded message in the digital image.
摘要:
Apparatus for embedding information in a digital image digitized from a developed photographic film in response to a film property and information to be embedded into the digital image includes a scanner for scanning the image on the developed photographic film to produce the digital image. The apparatus stores the film property and has input circuitry for storing information associated with the image and to be embedded in the digital image. The apparatus responds to the stored the film property and the associated information for modifying a predetermined number of pixel values with the associated information in the digital image so that the associated information is embedded in the digital image, wherein the embedded information can subsequently be extracted.
摘要:
A message is embedded into a digital image by forming a digitized version of the message and convolving the digitized message with a random phase carrier to form a scrambled message. The scrambled message is then combined with the digital image to form an embedded message image that is near impossible to extract without knowledge of the formation of the random phase carrier.