Zhuofu Liu

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This paper presents a method for co-registration of Chang'E-1 lunar orbiter stereo images and laser altimeter (LAM) data for 3D mapping of lunar surface. First, a digital elevation model (DEM) is automatically generated from the three-line CCD stereo images based on rigorous pushbroom sensor model and multi-level image matching. The DEM is then registered(More)
This paper presents a supervised classification method of sonar image, which takes advantages of both directional wavelet (DW) and fuzzy fractal dimension (FFD). The definition of FFD is an extension of the pixel-covering method by incorporating the fuzzy set. DW is used for the decomposition of original images. In the process of feature extraction, a(More)
On the basis of the flow feature in the micro blood vessels, a method to track the trace of cell movement was proposed in this paper. The algorithm employed the space domain enhancement, adaptive threshold segmentation techniques. For the sake of calculating blood flow, the active contour-based template matching method was applied to sequential images. The(More)
This study examined the subjective rating of wheelchair comfort and discomfort (numerical rating scale questionnaire) and the duration of objective in-chair movement reduction "settling down time" following initial contact with the seating surface. Healthy young subjects (n = 22) sat for 5 min on contoured foam or wood cushion surfaces fitted to otherwise(More)
AIM OF THE STUDY To determine whether 3 fixed positions of seat-subject interface temperature measurement offer more information than a single point of measurement. MATERIALS AND METHODS Temperature data was simultaneously acquired (sampling frequency 1 Hz/sensor) from each of three sensor positions (right & left mid-thigh and coccyx), from the(More)
In order to solve the problem of deformation and blurred edge in sonar image segmentation, a snake model based on the cellular neural network (CNN) architecture is presented. The approach is generated in snake models which evolve pixel by pixel from their initial shapes and locations until delimiting the objects of interest. The model deformation is guided(More)
This study presents a method for objectively measuring in-chair movement (ICM) that shows correlation with subjective ratings of comfort and discomfort. Employing a cross-over controlled, single blind design, healthy young subjects (n = 21) sat for 18 min on each of the following surfaces: contoured foam, straight foam and wood. Force sensitive resistors(More)
People today spend longer seated resulting from changes in demand on the workforce. As a result there is a need for a greater understanding of factors affecting pressure sore formation and comfort in general. In order to monitor the body-cushion interface temperature, we have developed a portable five-channel temperature measuring system which can be(More)