Abstract:
A JPEG2000 compressed image is transcoded to a lower bit-rate or lower resolution, or both, without having to decompress the initial JPEG2000 image and then recompress it to a lower bit-rate and/or resolution. Instead, arithmetic decoding is performed only to the nearest higher bit-rate layer, up to the desired resolution, before performing rate-distortion optimization to produce the transcoded image.
Abstract:
A JPEG2000 compressed image is transcoded to a lower bit-rate or lower resolution, or both, without having to decompress the initial JPEG2000 image and then recompress it to a lower bit-rate and/or resolution. Instead, arithmetic decoding is performed only to the nearest higher bit-rate layer, up to the desired resolution, before performing rate-distortion optimization to produce the transcoded image.
Abstract:
A print media (200) comprises paper or other substrate, on which image content, whether text or images are printed with accompanying hidden data (220). The image content is printed with one or more normal printing process visible colorants (340), while the hidden data (220) is printed with spectral edge markers (320). The spectral edge marker materials (320) have a substantial spectral absorption just outside the human visible spectrum, and only slight visible absorption, which is masked by the visible colorants (340). Although the hidden data is nominally visually imperceptible, an image capture device (250) having a visible spectral response that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, can then detect the hidden data.
Abstract:
A method for providing digital watermarking for text or images that uses spectral edge marking materials (320) printed on a print media (200) to embed hidden data (220). The spectral edge markers (320) have an absorption spectrum at the edge of the human visible spectrum, either at the UV edge or IR edge, which provides an optical density that is generally imperceptible to humans, but which can be detected by an image capture device (250). The crosstalk of visible optical absorption provided by these materials is largely masked by the presence of visible colorant(s) (340), with only small color differences between areas with and without the spectral edge markers (320). The image capture device (250) has a visible spectral response that extends into a spectral region just outside the visible spectrum where the spectral edge marker absorption occurs, and can be operated to detect the hidden data.
Abstract:
An imaging apparatus with adjustable imaging plane, said apparatus having mechanical, electronic or optical means to adjust the position and the orientation of the imaging plane, which successively captures a plurality of images while adjusting the imaging plane, and a method to integrate the captured images to a single high-resolution image by exploration of the mutual information not available in a single image, such as the sub-pixel observations due to the spatial misalignment, thus achieving an image resolution higher than the senor resolution.
Abstract:
A method and apparatus for capturing image data from multiple image sensors and generating an output image sequence are disclosed. The multiple image sensors capture data with one or more different characteristics, such as: staggered exposure periods, different length exposure periods, different frame rates, different spatial resolution, different lens systems, and different focal lengths. The data from multiple image sensors is processed and interleaved to generate an improved output motion sequence relative to an output motion sequence generated from an a single equivalent image sensor.
Abstract:
A method of analyzing a digital video clip captured by a camera to determine candidate frames for subsequent key frame selection including providing a camera motion sensor in the camera so that information is provided during image capture regarding camera motion including translation of the scene or camera, or scaling of the scene; forming a plurality of video segments based on the global motion estimate and labeling each segment in accordance with a predetermined series of camera motion classes; extracting key frame candidates from the labeled segments and computing a confidence score for each candidate by using rules corresponding to each camera motion class and a rule corresponding to object motion.
Abstract:
A method for compressing a digital image having both saturated text and/or line art and pictorial imagery, the method comprises the steps of: receiving the digital image as blocks of pixels; analyzing the block content to determine if all or any combination of the saturated text and/or line art, pictorial imagery or other types of image data are present; assigning the saturated text and/or line art, the pictorial imagery, the other types of image data to one of a plurality of categories; compressing the block of saturated text and/or line art, if any, according to a first predetermined compression method; compressing the pictorial imagery, if any, according to a second predetermined compression method; compressing the other types of imagery, if any, according to other predetermined compression methods; and providing means of conveying the image categories to a decoder.
Abstract:
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.
Abstract:
A frame in an uncompressed digital video signal is selected for encoding as a high-fidelity still image. The digital video signal is MPEG encoded to produce an MPEG encoded bitstream and additional bits are employed to encode the selected frame, to produce the MPEG encoded bitstream. The additional bits are determined by fixing the values of MQUANT and "intra DC mult" for all macroblocks in the selected frame. In an alternative method, the extra bits are determined by repeating the selected frame a plurality of times in the digital video signal prior to encoding the selected frame.