33results about How to "In line with observation habits" patented technology

The invention provides an interactive image processing method used for a video. The method comprises the following steps of extracting key frames from a video sequence; overlaying frames between adjacent key frames one by one to form a key frame cluster used for interactive marking; distinguishing the images of the key frames into a foreground area, a background area and an unknown area; carrying out spectral clustering and alpha value estimation on the key frames to obtain the sectional drawing result of the key frames; and finally, transferring the sectional drawing result of the key frames to the whole video sequence to obtain a final sectional drawing result. Because the foreground points are interactively marked on each key frame cluster, spatiotemporal information contained in the video sequence is fully utilized, and the naturalness and the intuition of user interaction are guaranteed on the basis of the user interface of the key frame, thereby conforming to the observation habit of a human visual system. Marking on the key frame clusters replaces independently marking on the key frames, and therefore the method has strong robustness for the situation with the big foreground object local action.

The invention discloses a high precision rapid extraction method of the centerline of blood vessels based on a boundary distance field, which mainly solves problem that both the extraction rate of blood vessel in CAT angiogram volume data and the extraction precision of centerline are low. The method comprises the following steps of using octree for partitioning the volume data and recording all blocking partition information; using relationship between maximum value and minimum value of each blocking partition and dual threshold for extracting blood vessels and calculating the boundary distance field; using the summation of reciprocal of gradient value of blood vessel voxel in the original CTA data and laplace transformation value as the initial value of the boundary distance; establishing a maximum cost spanning tree based on the boundary distance field and extracting the trunk of the tree as initial centerline of blood vessels; using gravity method for revising the initial centerline, thus leading the points on the centerline to be at the gravity center of the cross section of blood vessel lumen, thus obtaining the final blood centerline. The extraction method has the advantagesof high blood vessel extraction rate, high centerline extraction precision, and is applicable to the centerline extraction of various lumen tissues.

The invention belongs to the field of computer-generated holography and three-dimensional display, and particularly relates to a time-division multiplexing-based color holographic three-dimensional display method and system. By the display system, a multi-view two-dimensional image of a color target object is obtained by a method of CCD camera or computer graphics; a group of target images suitable for phase-type hologram calculation are generated after a preprocessing transformation process; a corresponding phase-type hologram is calculated by an iterative Fourier transform algorithm and is loaded to a spatial light modulator in a time-division manner; a synchronization control circuit controls red, green and blue three-color light sources to synchronously display in sequence; and three monochromatic holographic reconstructed images are generated on a reconstruction plane in a time-division manner, and corresponding reconstructed image pixels are directionally diffracted to the position at which a pixel-type nano grating is fixed to form different viewpoints, thereby obtaining multi-view color reconstructed images and achieving true color three-dimensional display. The hologram is quickly refreshed and loaded by combining the spatial light modulator, so that the multi-view real color full-parallax dynamic holographic three-dimensional reconstruction of the target object is achieved.

The present invention discloses a method and an apparatus for determining a plane in point cloud data, and an image superposition method and device. The method for determining the plane in point cloud data comprises: dividing the point cloud data into a plurality of sub data sets according to coordinates; determining a partial plane for each sub data set in the plurality of sub data sets; and fusing the partial planes corresponding to all the sub data sets and determining a global plane in the point cloud data, wherein the global plane comprises at least one plane. Since there is no need for multi-plane detection of point cloud data, the global plane in the point cloud data can be determined, so that the time taken in the step for multi-plane detection of point cloud data is saved and the processing speed for determining the plane in point cloud data is improved.