摘要:
A method for accurately measuring flicker, by first determining an original value based on a difference between pixel values in corresponding locations in a first picture and a second picture. Next, a reconstructed value is determined, based on a difference between pixel values in corresponding locations in a reconstruction from an encoding of the first picture and a reconstruction from an encoding of the second picture. Then, a determination is made to include a comparison value, which is determined on a difference between the reconstructed value and the original value, in a measurement of flicker between the first picture and the second picture.
摘要:
A method for accurately measuring flicker, by first determining an original value based on a difference between pixel values in corresponding locations in a first picture and a second picture. Next, a reconstructed value is determined, based on a difference between pixel values in corresponding locations in a reconstruction from an encoding of the first picture and a reconstruction from an encoding of the second picture. Then, a determination is made to include a comparison value, which is determined on a difference between the reconstructed value and the original value, in a measurement of flicker between the first picture and the second picture.
摘要:
Various implementations for reducing artifacts such as, for example, I-frame flicker are proposed. Particular implementations produce a no-flicker reference in which a picture intended to be coded as an I-frame is, first, coded as a P-frame using a reference picture from the previous GOP. Thus, continuity with the previous GOP is provided. According to a general aspect, a source image is inter-coded to produce coded source data. The coded source data is decoded to produce a modified source. The modified source is intra-coded to produce coded modified-source data. The coded modified-source data is decoded to produce a reference image.
摘要:
The present invention relates to a full-reference (FR) objective method for assessing perceptual quality of decoded video frames in the presence of packet losses and coding artifacts. A method of assessing perceptual quality is provided. First, a value indicating an amount of distortion in a corresponding portion is accessed. Then, that value is classified as packet-loss distortion or coding-artifact distortion. Next, the classified value is modified to account for visibility differences of the human visual system, based on the classification, and then the modified values are combined for the multiple portions, to form a value indicating a total amount of distortion for the multiple portions.
摘要:
A method and apparatus are provided for predictive frame selection supporting enhanced efficiency and subjective quality. The apparatus includes an encoder for encoding a picture using a selection scheme that selects between encoding the picture as a single direction inter predictive picture type and a bi-directional inter predictive picture type based on coding efficiency and a determination of a flickering artifact resulting from coding the picture as the bi-directional inter predictive picture type.
摘要:
An encoding methodology for a video encoder encodes target light change (TLC) frames in order to improve the quality of the resulting decoded video. Backward prediction is applied instead of forward prediction to the frames that are detected as TLC frames. Additionally, the last frame of the TLC activity is forced to use only intra-coding modes.
摘要:
A method and apparatus are provided for predictive frame selection supporting enhanced efficiency and subjective quality. The apparatus includes an encoder for encoding a picture using a selection scheme that selects between encoding the picture as a single direction inter predictive picture type and a bi-directional inter predictive picture type based on coding efficiency and a determination of a flickering artifact resulting from coding the picture as the bi-directional inter predictive picture type.
摘要:
The subject matter described herein includes methods, systems, and computer readable media for image guided ablation. One system for image guided ablation includes an ultrasound transducer for producing a real-time ultrasound image of a target volume and of surrounding tissue. The system further includes an ablation probe for ablating the target volume. The system further includes a display for displaying an image to guide positioning of the ablation probe during ablation of the target volume. The system further includes at least one tracker for tracking position and orientation of the ablation probe during the ablation of the target volume. The system further includes a rendering and display module for receiving a pre-ablation image of the target volume and for displaying a combined image on the display, where the combined image includes a motion tracked, rendered image of the ablation probe and an equally motion tracked real-time ultrasound image registered with the pre-ablation image.
摘要:
Technologies may provide for detecting, validating, or confirming the validity of a handwritten signature. A logic architecture may be employed to detect a digital handwritten signature and validation data associated with a signature event, and to send the signature and the validation data to a trusted server. The logic architecture may validate the digital handwritten signature based on the signature and the validation data. Additionally, the logic architecture may present the digital handwritten signature with a reference to confirm the validity of the signature. The reference may be associated with identifying information corresponding to the event to confirm the validity of the signature.
摘要:
A method and apparatus are provided for encoding with hypothetical reference decoder compliant bit allocation. The apparatus includes an encoder (100) for encoding image data for a picture in a resultant bitstream by controlling a bit allocation during the encoding of the image data responsive to satisfying requirements for a subsequent decoding of the bitstream. The requirements relate to preventing at least one of an underflow condition and an overflow condition in a buffer during the subsequent decoding of the bitstream.