Standard edge detectors react to all local luminance changes, irrespective of whether they are due to the contours of the objects represented in a scene or due to natural textures like grass,...
We combine in this paper the topological gradient, which is a powerful method for edge detection in image processing, and a variant of the minimal path method in order to find connected contours. The topological gradient provides a more global analys
Math 155 is an introductory course on mathematical models for image processing and analysis. The students will become familiar with basic concepts (such as image formation, image representation, image quantization, change of contrast, image enhancement, noise, blur, image degradation), as well as with mathematical models for edge and contour detection (such as the Canny edge detector), filtering, denoising, morphology, image transforms, image restoration, image segmentation, and applications. All theoretical concepts will be accompanied by computer exercises.. ...
Automated Method and System for the Segmentation of Lung Regions in Computed Tomography Scans A method and system for the automated segmentation of the lung regions in thoracic CT scans includes construction of a cumulative gray level profile from pixels along the diagonal of each CT section image. The shape of this profile is used to identify a gray level threshold that is used to create a binary image. A contour detection algorithm generates a segmented thorax region. The trachea and main bronchi are segmented and eliminated from the segmented thorax region to prevent subsequent inclusion within the segmented lung regions. A gray level histogram is constructed to identify a second gray level threshold, which is applied to the segmented thorax region to create a binary image. If the two lungs regions are
An improved apparatus and method for forming a three-dimensional object by planar deposition of forming materials includes containers for holding molten forming materials, mechanical piston or screw members in the containers for pressurizing the molten forming materials in each of the containers, and an adjustable planar nozzle mechanism coupled to the containers through which the pressurized molten forming materials flow to form variable width planar jets that are deposited in layers onto a substrate movable along three axes to form the three-dimensional object. The adjustable planar nozzle mechanism includes cooperating position controllable plates for forming a variable width planar nozzle opening. The edges of the planar nozzle opening are advantageously non-parallel at the ends of the nozzle opening to ensure uniform thickness of the deposited planar jets.
A device and method for the production of three-dimensional objects is disclosed. The device comprises a container (1), for a medium (2) and a three-dimensionally positionable dispenser (4), for delivery of a material (3), the addition of which to the medium (2) leads to the formation of solid structures in the medium (2). The addition of the material (3), by movement of the dispenser in the XYZ-directions on a platform (8), beneath the filling level of the first material (2) in the container (1) leads to the formation of three-dimensional objects.
A method for forming a surface-treated, three-dimensional object, comprising: solvent smoothing an exterior surface of a rapid-manufactured, three-dimensional object, and media blasting at least a portion of the solvent-smoothed exterior surface.
The RVA (Right Ventricular Analysis) workflow offers analysis of the right ventricle. The workflow offers two contour detection methods for the right ventricle. For calculation of ventricular volume, seven volume models are implemented.
Since the texture inside an uncamouflaged objects boundary is often different to the texture outside, it would seem undesirable to integrate texture modulation across the border. In order to see if the visual system is able to be selective, we used RF textures divided into inner and outer regions, and used a readily detectable contour to segment the regions in some instances, so that we could characterize the effect of texture differences and also that of segmenting contours. An area of texture was split into two regions; the regions were matched such that they were of equal area. Modulation was manipulated such that it either appeared only in the Inner, Outer, or in Both regions. For modulation that appeared in the Inner and Outer regions, their respective outer and inner regions were filled with nonmodulated circular texture. Potentially when one texture is surrounded by another area of differing texture, the surrounded area can appear to perceptually "pop out." This is known as texture ...
Thick Concavity Slides available at LabScientific. Made of 3mm thick clear glass, slides are available with single, double or triple concavities.
To assess the influence of attention on the amplitude and timing of brain responses involved in figure versus background processing, participants were instructed to fixate on a fixation mark at the center of the display and perform one of two different tasks in separate experimental blocks. In the Shape Discrimination trials, the observers indicated a change in the shape of the figure with a button press (see Figure 1b). On 20% of the 1.67-second stimulus cycles, the aspect ratio (horizontal to vertical) of the figure became elliptical (,1). Responses were monitored and the figure aspect ratio was adjusted to maintain performance at approximately 80% correct detection. In the Letter Detection trials, the observers were instructed to attend to a stream of simultaneously presented letters and to detect a probe letter "T" among distracters "L" (see Figures 1c and 1d). Letter arrays containing "L"s and "T"s appeared superimposed upon the figure region of the stimulus and were preceded and followed ...
The diffogram, which is shown to the right (click to enlarge), is my favorite graph for multiple comparisons of means. Every diffogram displays a diagonal reference line that has unit slope. Horizontal and vertical reference lines are placed along the axes at the location of the means of the groups. For these data, there are four vertical and four horizontal reference lines. At the intersection of most reference lines there is a small colored line segment. These segments indicate which of the 4(4-1)/2 = 6 pairwise comparisons of means are significant. Lets start at the top of the diffogram. The mean for the Caldecot site is about 0.3, as shown by a horizontal reference line near Y=0.3. On the reference line for Caldecot are three line segments that are centered at the mean values for the other groups, which are (from left to right) IslandThorns, AshleyRails, and Llanederyn. The first two line segments (in blue) do not intersect the dashed diagonal reference line, which indicates that the means ...
This video explains how to construct a line segment. When constructing a line segment, we use a compass and straightedge to first draw a ray or line and then a point that will serve as an endpoint of the new segment. Next, we measure the given segment with a compass and make a mark with the pencil end. Without changing the spacing of the compass, place the sharp end of the compass on the point drawn on the new line/ray, and make a mark on the line/ray. This is our line segment.(2:02) ...
Animations to explore and demonstrate the shapes of two-dimensional cross-sections of three-dimensional objects and identify three-dimensional objects generated by rotations of two-dimensional objects
Editors note: This advice is provided for educational purposes abandoned and is not meant to analyze or amusement any condition.[[caption id=
The brain directs our bodys internal functions. It also integrates sensory impulses and information to form perceptions, thoughts, and memories.
The paper presents characteristic shapes of the Bezier curves used in modeling the biological objects. Notation of polynomial curves of second, third and fourth order in Bezier representation with application of Bernstein basic functions is presented. The use of polynomials of third order in Bezier representation in modeling of biological objects of complex shapes is recommended. For modeling of fruit and vegetable shapes (3D solids) a meridional sphere was proposed, with Bezier curves as meridians. For modeling biological objects of shape approximated to solids of revolution there was worked out a method consisted in rotation of generating line, made of the Bezier curve or the B-spline curve consisted of several Bezier curves. Also 2D objects can be modeled with the use of Bezier curves.
This MATLAB function accepts a multipart line in latitude-longitude with vertices stored in arrays lat and lon, and merges the parts wherever a pair of end points coincide.
Problem/Motivation Configuration object wonderful.settings should be able to be like: node: article: status: TRUE wonderful: FALSE page: status: FALSE wonderful: FALSE user: user: status: TRUE wonderful: TRUE and schema: wonderful.settings: type: sequence label: Entity type sequence: - type: sequence label: Bundle sequence: - type: mapping label: Wondeful settings mapping: status:
You may now wish to go back to the Separate command and modify the cut by cutting some material from one of the objects, which will go to the other. You can cut back and forth until the partitioning is to your liking ...
Buy Da-Lite 88532LSRMOV Tensioned Contour Electrol 58 x 104 Motorized Screen (120V) features 119 Diagonal / 16:9 Aspect Ratio, High Contrast Da-Mat Surface. Review Da-Lite Electric Screens (Wide Formats), Projection Screens (by Type)
Flattens 3D objects as DFX file into a printable 2D DXF file. To obtain a paper model of the 3D object, the printed sheet can be cut out and glued…
[vec.tor] n [NL, fr. L, carrier, fr. vehere to carry--more at way] (1846) 1 a: a quantity that has magnitude and direction and that is commonly represented by a directed line segment.
Deviations Δs,t and u of intermediate points Pi+1··· Pj−1 to a line segment between two endpoints Pi and Pj. (Refer main text.)
When two line segments meet at a sharp angle and miter joins have been specified for stroke-linejoin, it is possible for the miter to extend far beyond the thickness of the line stroking the path. The stroke-miterlimit imposes a limit on the ratio of the miter length to the stroke-width. When the limit is exceeded, the join is converted from a miter to a bevel.
instances, and the line segments that connect them. For example, you could use an polyline to represent a road or the path along which something moves.. You can add polyline shapes to the map by adding them to an ...
The Geelong Roads are all the roads in the City of Greater Geelong. They are managed either by Vicroads or the City. The streets are broken down into block-long line segments ...
The LockRotate cell does not prevent a 1-D shape from being rotated when an endpoint is dragged. To lock a 1-D shape against rotation, set the LockWidth cell to a non-zero value (TRUE).. To get a reference to the LockRotate cell by name from another formula, or from a program using the CellsU property, use:. ...
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Are you new to the world of foundation or have you never felt like youve found an ideal shade match? Not to worry -- we can still help!. Find your Shade. ...
Upon receiving the Contours Options Elite Tandem Stroller and taking the parts out of the box, I must admit I was a bit concerned that the stroller was going to be time consuming to assemble. But, I quickly realized that … Continue reading →. ...
Join Jeff Bartels for an in-depth discussion in this video Defining proposed grading from contours, part of Civil 3D Essential Training
In the LucidObject library, objects can be created through dialog boxes in LucidStudio or instanced by function calls in LucidShell to build up the Digital Mock Up

Purpose: : Recent progress in understanding the pathogenesis of macular degeneration has led to potential new treatments for the disease. There is an increasing demand for new visual function tests that are more sensitive than current standards to monitor disease progression and to evaluate treatment effect. Our previous studies demonstrated that patients with macular degeneration have significant loss in global shape discrimination hyperacuity. In this study, we determined the rate of progressive loss of this hyperacuity in patients with Stargardt macular dystrophy (STGD). Methods: : Sixty-eight patients with STGD were selected on the basis of 20/200 or better visual acuity in at least one eye at their first visit. The average age at the first visit was 33±15SD years, and the average follow-up was 4.3±2.8SD years. Visual stimuli were circular shapes (radial frequency patterns). Shape discrimination hyperacuity was determined by using a two-alternative forced-choice paradigm. Each trial ...
TY - JOUR. T1 - Visual form perception. T2 - Congruence among spatial configurations. AU - Aiken, Leona S.. AU - Brown, D. R.. PY - 1969/5/1. Y1 - 1969/5/1. N2 - Multidimensional scaling (MDS) techniques were used to obtain spatial solutions for judgments of similarity and discrimination difficulty between pairs of random polygons. For both tasks, it was possible to psychophysically predict the three dimensions of the final solutions using physical measures of the forms. These solutions were compared to each other and to a spatial analysis of discrimination difficulty measured in visual noise (Aiken & Brown, 1968) using canonical correlation techniques. Although the two judgment tasks were highly similor, it was concluded that neither was similar to the discrimination-in-noise solution.. AB - Multidimensional scaling (MDS) techniques were used to obtain spatial solutions for judgments of similarity and discrimination difficulty between pairs of random polygons. For both tasks, it was possible to ...
TY - GEN. T1 - Study on the frosting phenomena between concavity and convexity plate under forced convection-analysis of frost layer growth. AU - Kaneko, Akira. AU - Takano, Yusuke. AU - Miyahara, Ryo. AU - Morita, Kenrou. AU - Katsuta, Masafumi. PY - 2015. Y1 - 2015. N2 - In recent years, electric vehicles have been actively developed, and to use heat-pump system is meaningful for air conditioning system for electric vehicle. But frost formation of external heat exchanger becomes a problem under the heating cycle. To improve of heat exchange performance and to inhibit frost formation for heat pump system, fin-less heat exchanger is proposed. In this study, we investigated basic characteristic of frost formation of the flow path between flat plate with concavity and convexity under forced convection. Test section is a flow path that is placed opposite to a flat plate having a periodic concavity and convexity groove on the surface. Experiment was conducted using structure of concavity and ...
A surface shape recognition apparatus includes detection circuit, comparison circuit, storage circuit, and control circuit. The detection circuit electrically detects a surface shape pattern in a partial region of the target collation surface of an object using a plurality of sensor elements and outputs detection data representing the surface shape pattern. The comparison circuit compares the detection data from the detection circuit with predetermined collation data and outputs a comparison result. The storage circuit stores template data representing the surface shape pattern of the entire target collation surface, the template data being obtained from the object in advance. The control circuit partially reads out, as collation data, the template data stored in the storage circuit from an arbitrary position, outputs the collation data to the comparison circuit, and performs determination for authentication between the template data and the object on the basis of the comparison result from the
BACKGROUND: The perception of global form requires integration of local visual cues across space and is the foundation for object recognition. Here we used magnetoencephalography (MEG) to study the location and time course of neuronal activity associated with the perception of global structure from local image features. To minimize neuronal activity to low-level stimulus properties, such as luminance and contrast, the local image features were held constant during all phases of the MEG recording. This allowed us to assess the relative importance of striate (V1) versus extrastriate cortex in global form perception. METHODOLOGY/PRINCIPAL FINDINGS: Stimuli were horizontal, rotational and radial Glass patterns. Glass patterns without coherent structure were viewed during the baseline period to ensure neuronal responses reflected perception of structure and not changes in local image features. The spatial distribution of task-related changes in source power was mapped using Synthetic Aperture Magnetometry
An object tracking method uses a system having an object identifying device and at least one video tracking device, wherein the object identifying device monitors an area to identify an object entering the area and the video tracking device wired/wirelessly connected to the object identifying device monitors the area monitored by the object identifying device. The method includes: extracting, at the object identifying device, object identification information of the object; providing, at the object identifying device, the object identification information to the video tracking device; tracking, at the video tracking device, the object to extract physical information of the object; mapping, at the video tracking device, the physical information to the object identification information to generate object information of the object; and storing, at the video tracking device, the object information in a memory of the video tracking device.
The human visual system seems to be equipped with mechanisms to establish whether or not a two-dimensional image represents a view of a structurally possible three-dimensional object. An example is provided by the so-called impossible objects, first described by Penrose & Penrose [1]. These consist of two-dimensional figures at first perceived as representing a projection of a three-dimensional object, but then immediately and effortlessly recognized as an object that cannot actually exist in the form interpreted by the visual system.. Several local cues need to be integrated to detect global inconsistencies in structural information, allowing discrimination between possible and impossible objects; a long-standing debate exists as to the role played by experience with real three-dimensional objects in the development of these abilities [2,3].. Recently, Shuwairi et al. [4] reported that four-month-old infants can discriminate between structurally possible and impossible objects. However, four ...
An apparatus for producing a three-dimensional object by successive solidification of layers of a powder material at points corresponding to a cross-section of said object using electromagnetic or particle radiation comprises support means having an upper side for supporting the object thereon at a determined elevation, elevation adjustment means for varying the elevation, means for applying a layer of the material onto the upper side or onto another layer formed on the upper side, and irradiation means for irradiating the layer of the material at the points corresponding to a cross-section of the object. For reducing the production time of the object the apparatus further comprises a prefabricated base plate on the upper side, the base plate being made of a material which the powder material adheres to when being solidified, and means for removably connecting the base plate to the upper side of the support means.
The Journal of Allergy and Clinical Immunology: In Practice talks about cough frequency patterns differ between patients with and without asthma.
Our lab investigates the neural basis of visual shape representation and recognition. Our focus is area V4, an intermediate stage in the shape processing pathway in primates.. We use a combination of single-cell neurophysiology experiments, behavioral manipulations and computational modeling to address questions about how visual stimuli are represented in the brain, how these representations arise and how they ultimately underlie behavior.. More.... ...
In this way, it is possible to calculate the AUC by using an average of a number of trapezoidal approximations. It is also common to calculate the Area Under the ROC Convex Hull (ROC AUCH = ROCH AUC) as any point on the line segment between two prediction results can be achieved by randomly using one or other system with probabilities proportional to the relative length of the opposite component of the segment.[17] It is also possible to invert concavities - just as in the figure the worse solution can be reflected to become a better solution; concavities can be reflected in any line segment, but this more extreme form of fusion is much more likely to overfit the data.[18] The machine learning community most often uses the ROC AUC statistic for model comparison.[19] This practice has recently been questioned because AUC estimates are quite noisy and suffers from other problemns.[20] [21][22]. Nonetheless, the coherence of AUC as a measure of aggregated classification performance has been ...
modifies the plot produced by an LSMEANS statement with the PDIFF=ALL option (or just PDIFF, since ALL is the default argument). The ABS and NOABS options determine the positioning of the line segments in the plot. When the ABS option is in effect, and this is the default, all line segments are shown on the same side of the reference line. The NOABS option separates comparisons according to the sign of the difference. The CENTER option marks the center point for each comparison. This point corresponds to the intersection of two least squares means. The NOLINES option suppresses the display of the line segments that represent the confidence bounds for the differences of the least squares means. The NOLINES option implies the CENTER option. The default is to draw line segments in the upper portion of the plot area without marking the center point. ...
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Of the presently available methods for segmentation of anatomic objects from medical images, principally interactive ones are the most commonly used in clinical practice. More automatic techniques are based on statistical pattern recognition (thresholding), mathematical morphology, deformable models with local geometric constraints (active surfaces), or deformable structural models, i.e., using models that involve nonlocal spatial relationships. The methods involving the deformation of structural models seem distinctly the most successful, and they lend themselves not only to segmentation but also to shape measurement and registration. It is on these that we focus. Access to our papers on object segregation and shape representation, subdivided into topic areas, can be made through the Bibliography page. A tutorial on object shape representation is available here. A deformable structural model for one or more objects can be based on a variety of primitives. Among the possible primitives are ...
This paper presents a non-photorealistic shading approach to enhance 3D shape appearance given in 2D natural images that do not have depth information. The
Several methods for vanishing point detection make use of the line segments detected in images. Other techniques involve considering the intensity gradients of the image pixels directly. There are significantly large numbers of vanishing points present in an image. Therefore, the aim is to detect the vanishing points that correspond to the principal directions of a scene. This is generally achieved in two steps. The first step, called the accumulation step, as the name suggests, clusters the line segments with the assumption that a cluster will share a common vanishing point. The next step finds the principal clusters present in the scene and therefore it is called the search step. In the accumulation step, the image is mapped onto a bounded space called the accumulator space. The accumulator space is partitioned into units called cells. Barnard [4] assumed this space to be a Gaussian sphere centered on the optical center of the camera as an accumulator space. A line segment on the image ...