摘要:
A method for producing an assured image acquires image data and segments the image data into one or more spatial regions. One or more quality measures is calculated from the image data that is within the one or more spatial regions. Secure assurance data is produced that is representative of the one or more quality measures and the image data. The secure assurance data is associated with the image data to produce the assured image.
摘要:
A method for assessing the image quality of image data acquires image data, segments the image data into at least one spatial region, obtains a plurality of image quality measures for the at least one spatial region, and forms at least one quality vector that has two or more quality measures for the at least one spatial region. The at least one quality vector is classified into one of a plurality of predefined quality classes.
摘要:
A method for producing an assured image acquires image data and segments the image data into one or more spatial regions. One or more quality measures is calculated from the image data that is within the one or more spatial regions. Secure assurance data is produced that is representative of the one or more quality measures and the image data. The secure assurance data is associated with the image data to produce the assured image.
摘要:
A method for producing an assured image from image data that is transferred from a first entity to a second entity acquires image data, transfers the acquired image data from the first entity to the second entity, forms secure assurance data according to image quality measurements obtained from the acquired image data, and forms an assured image that includes the acquired image data and the secure assurance data. At least one image quality message is generated that indicates the transfer of the acquired image data from the first entity to the second entity and is representative of the image quality measurements. The at least one image quality message is presented to at least one of the first entity and the second entity.
摘要:
A method for assessing the image quality of image data acquires image data, segments the image data into at least one spatial region, obtains a plurality of image quality measures for the at least one spatial region, and forms at least one quality vector that has two or more quality measures for the at least one spatial region. The at least one quality vector is classified into one of a plurality of predefined quality classes.
摘要:
A method for embedding message data in a digital image sequence having two or more frames, includes the steps of: providing a dispersed message image representative of the message data; and adding spatially shifted versions of the dispersed message image to successive frames of the digital image sequence.
摘要:
An efficient method for determining the compressed rate of a digital image with a given set of compression parameters, the method comprises the steps of forming a plurality of non-overlapping image regions, each of which includes a plurality of contiguous pixels, from the digital image where the total number of pixels contained in all of the contiguous regions is less than the total pixels in the digital image; compressing each region with the given set of compression parameters; and, combining the resulting rate from each region to form an estimate of the compressed rate of the digital image.
摘要:
A method for embedding a watermark signal that contains message data in a digital image represented as a two-dimensional array of pixel values, includes the steps of: providing a dispersed message image having pixel values representative of the message data; modifying each pixel value of the dispersed message image as a function of the corresponding pixel value in the digital image; and combining the modified dispersed message image with the digital image to produce a watermarked image.
摘要:
A method for embedding a watermark signal that contains message data in a digital image sequence having two or more frames, includes the steps of: producing a set of two or more different carrier signals from a single secure key; assigning a carrier signal from the set of carrier signals to each frame in the sequence; and embedding a watermark signal in each frame using the corresponding assigned carrier signal.
摘要:
A method of generating a plurality of quantization parameter sets for compressing a digital image to different rates, the method comprises the steps of providing characteristics of an intended display medium; specifying a plurality of threshold viewing distances from the display medium; generating a plurality of quantization parameter sets, one for each threshold viewing distance, using a human visual system model; and, indexing each quantization parameter set by the corresponding threshold viewing distance.