distance transformations in digital images examine and compare the angles and sides of the images, list the pre-image and image coordinates and to describe in words the transformation completed. 9. D. That’s Live Enterprise. And, when we apply any sort of transformations to a pixel-based image, we can lose quality. The major difference between both signals is that the analog signals have continuous electrical signals, while digital signals have non-continuous electrical signals. (1) a circle, (2) a square. To understand how a full and sustainable digital transformation can take place, it's important to examine the potential challenges or roadblocks an institution might face. significantly reduce learning curves, speed up. " For example, an image recorded by a 12 MP camera; since each pixel uses 3 bytes to record truecolor, the uncompressed image would occupy 36,000,000 bytes of memory—a great amount of digital storage for one image, given that cameras must record and store many images to be practical. Fig: Fundamental steps in digital image processing. If layers in a map have defined coordinate systems other than those of the map or local scene, a transformation between the coordinate systems may be necessary to ensure that data lines up correctly. Sensor modules, embedded software, and ready-to-deploy solutions for systems integrators, make Terabee the partner of choice for LiDAR, 3D depth sensing, low-resolution thermal imaging and radiofrequency positioning Mar 28, 2016 · To test our object_size. Aug 19, 2021 · In response to the disruption of the Caribbean education system, UNESCO, Blackboard and the Caribbean Centre for Educational Planning (CCEP) at the University of the West Indies launched the Education response to Covid-19: Distance Learning and Teacher Training Strategies in the Caribbean SIDS in January 2021 with the aim to train 10 000 teachers in the Caribbean SIDS in the use of online The distance from each vertex (and actually each and every single point ) of the preimage to the origin is equal to distance between the origin and each point of the image . Course Title : Digital Image Processing Total Number of Pages : 19 4. Sort by: Aug 25, 2021 · To perform a dilation, just multiply each side of the preimage by the scale factor to get the side lengths of the image, then graph. • Image is object blurred by 1/r • 2D FT of 1/r is 1/ρ • Why not de-blur image? – 2D FT of Image – Multiply FT by | ρ| – Invert FT • Voila! Back to the blurred layergram! If the image is blurred with a function whose FT is well behaved, we should be able to construct a de-blurring function. D Beckers and A. The EXIF information contained in the image is used to rotate the image appropriately. — March 3, 2020 — Microsoft Corp. Internal training costs saved 53%. The projective transformation is especially useful for oblique imagery, scanned maps, and for some imagery products such as Landsat and Digital Globe. Number of Employees 0-19 20-49 50-99 100-249 250-999 1000-1999 2000-4999 5000-19999 20000+ Our Digital Navigation Framework paves the way for this transformation with vital digital capabilities at its core, surrounded by a robust operating model and empowered people to help enterprises in their journey to Being Resilient. Let V= {1, 2} and compute the lengths of the shortest 4-, 8-, and m-path between p and q. Get our new ebook, Stop Fighting Digital Transformation, to see how end-to-end orchestration can drive efficiency, reliability, and innovation. 5'24 The distance between two points. Note that Landsat 4, 5, and 7 SR data are generated using the LEDAPS algorithm, while Landsat 8 SR data are generated using the LaSRC algorithm. Reflection is when we flip a figure over a line. Finally download straightened photo in png format to support transparent background. Record the coordinates of the pre-image and image in the table. Object image height and distance relationship. This allows for a less rigorous solution, using an approximation to reduce the number of computed transformations. Following are Fundamental Steps of Digital Image Processing: 1. 22. More general advice about the local HIPR installation is available in the Local Information introductory section. And then choosing Rasterize Type from the menu: The Rasterize Type command. 5- or 15-inch frame of reference. If left blank or 0 is specified, the approximation is not used. A digital input is an input of the system. Download PDF. Identify the Transformation. Digital Transformation means enhancing an organization’s core business operations to meet customer requirements efficiently by leveraging data and technology. Transformation of a gray scale image into pseudo color image helps in better visualization of the image. It is not a question of "if" your company should take on a digital transformation, but "how. Padlet is a digital pinboard that allows participants (students and teachers) contribute by pinning different images, videos, text files, links, and more. Created by: Mike Connor, CEO of Silicon Valley Insurance Accelerator (SVIA) This course will charge you with the right mood to embark on digitalization. x/NT and it is intended to measure length, angle, segments, perimeter and area in digital images. So, we get P1 =10. "Distance transformations in digital images", Comput. Use the OpenCV function cv::watershed in Image Recognition: Each object in an image can be distinguished. Image Acquisition: In image processing, it is defined as the action of retrieving an image from some source, usually a hardware-based source for processing. PRE-IMAGE IMAGE A'(-3J 2) Look for any patterns and describe what happened to the x and y values in each ordered pair: Digital Image Processing. Vision Graphics and Image Jun 16, 1995 · Digital mathematical morphology (MM) and the distance transform (DT) have many points of intersection. Digital Image Processing (DIP) - Multiple Choice Questions. Image Segmentation. . or onboard new hires, Newired helps you. Homework: 1. Diopters, Aberration, and the Human Eye. In response to the COVID-19 pandemic, companies across the globe made rapid digital transformations, accelerating their journeys to the future. Chicken tracks in the dirt are an example of which transformation? (This transformation has two steps) 5. Use the OpenCV function cv::distanceTransform in order to obtain the derived representation of a binary image, where the value of each pixel is replaced by its distance to the nearest background pixel. —numbers indicating variations of red, green, and blue at a particular location on a grid of pixels. 0 enables the digital transformation of supply chains. Which transformation do the following stand for? slide. The final result we get is shown below: binary images. and the National Football League on Tuesday announced an expansion of their deep technology partnership. In the midst of the global pandemic, digital technologies have captured our imagination for their potential to support us in the fight against COVID-19. 6K subscribers. Jan 22, 2021 · COVID-19 has accelerated the digital transformation of higher education Harnessing COVID-19’s digital dividend to finance the Sustainable Development Goals Its efforts in the area of environmental protection range from decarbonisation initiatives to innovative business models around the circular economy, as well as targeted biodiversity Object image and focal distance relationship (proof of formula) This is the currently selected item. Academic Press Inc Nov 10, 2021 · To get this effect, follow these steps: Tap Edit to select and upload your image into the PhotoDirector mobile app. Authors: Emmanuelle Gouillart, Gaël Varoquaux. Using as one unit distance the average distance between images. It is the first step in the workflow sequence because, without an image, no processing is possible. Next: Two-dimensional Fourier Filtering Up: Image_Processing Previous: Fast Fourier Transform Two-Dimensional Fourier Transform. py --image images/example_01. Relative Distance Between Consecutive Images: All the images within the mentioned distance will be used in the pairs matching. A. The y-axis is the number of pixels in the image having a given digital number. It primarily develops a computer system that performs processing on an image. Department of Numerical Analysis and Computing Science) Unknown Binding – January 1, 1986 Jul 13, 2014 · Figure 2. Distance transforms are also used to compute the medial axis (boundaries of Voronoi cells) of digital shapes [4]. Digital Image Processing ( Examples in Matlab) Tiểu Quyên. SAIC Links and Resources. translation reflection A figure can be slid in any direction. Mar 17, 2020 · The following is a guest post by David Welkowitz, attorney-advisor in the Office of the General Counsel. Image plane coordinates have their origin C0at the image center where the k axis intersects the image plane. , real-valued images rather than binary images). Intelligent 3D sensing devices and solutions to enable your digital transformation. Edge detection makes it possible to reduce the Enabling Digital Transformation with the Right UCaaS Solution (Frost and Sullivan) Provide your information to download White Paper. Rotation is when we rotate a figure a certain degree around a point. 3 Distance transformations in digital images. (Photo courtesy of the Minnesota Vikings) REDMOND, Wash. Life At SAIC. We can also say that it is a use of computer algorithms, in order to get enhanced image either to extract some useful information. Local Information. Basics of Digital Image Processing. This paper. M Smeulders. 2. <angle> The <angle> of rotation to apply to the image. You can adjust the Glitch effect by selecting presets or by adjusting the horizontal and vertical movement, distance, speed, rotation, and angle. Examples of this type of transformation are: translations, rotations, and reflections In other transformations, such as dilations, the size of the figure will change. If you want to look up, apply a rotation around Right , or multiply by R Xrot . Javier Quispe Quispe. Thus, 2D points in the image plane In some transformations, the figure retains its size and only its position is changed. Positive values cause the image to be rotated to the right (clockwise), negative values to the left (anti-clockwise). ” - Dan Schulman, CEO of PayPal. A short summary of this paper. Each translation follows a rule. 25turn). . Digital Transformation provides the opportunity for core business functions to fundamentally change the way work is done so that the organization can grow and remain competitive over time. article . It is rounded to the nearest 90deg (0. 11. Your output should look something like the following: Figure 2: Measuring the size of objects in an image using OpenCV, Python, and computer vision + image processing techniques. " This program provides a comprehensive framework for Jan 13, 2019 · In many real world applications, we u s e Machine Learning algorithms for classifying or recognizing images and for retrieving information through an Image’s content. Padlet. Conceptually, it makes sense since the software has that 7. The anatomy of digital transformations Digital innovation to combat COVID-19. Driving business value A pressing concern for possibly any company that starts on the journey to digitization could be the clear ability to show benefits and realize value from Once you have applied a transformation, all further rotations are relative to the new coordinate system. Commercial package for windows. The different steps of the algorithm are as follows. 1. Learn about these algorithms and their differences from USGS. Intensity Transformations and Spatial Filtering. Aug 14, 2020 · Orbit Image Analysis is a free open source software for quantifying large-format images such as whole slide images of tissue. W. Digital Image Fundamentals. Whether your goal is to introduce new products. Free Access. Below is the equation to transform a raster dataset using the affine (first order) polynomial transformation. Home Browse by Title Periodicals Computer Vision, Graphics, and Image Processing Vol. It can load images from local disk or connect to an Open Microscopy Environment image server ( Omero ) and can process images on a local computer or on a cluster using Spark job server . Dec 29, 2018 · We apply linear interpolation with weights fx for both A and B (See Image-1) as 0. This section addresses basic image manipulation and processing using the core scientific modules NumPy and SciPy. Example 5 The origin might be the most common point of reflection, but you can use any point. In this example, the scale factor is 1. A lookup table is used, that assigns 0 or 1 to each configuration of the 3x3 binary square, whether the central pixel should be removed or kept. (5 marks) 4. Image manipulation and processing using Numpy and Scipy ¶. What is a congruent transformation? 2. A distance transformation converts a binary digital image, consisting of feature and non-feature pixels, into an image where all non-feature pixels have a value corresponding to the distance to the nearest feature pixel. 3 trillion that was invested in digital transformation, more than $900 billion has been wasted. Vernon Machine Vision, Prentice-Hall, 1991, Chap. A digital image is nothing more than data. However, of the $1. If I convert my type into pixels, I lose the ability to edit my text. (4 marks) (b) Given the 2D pixel coordinates of a point in the image and the distance of the camera from the Jul 20, 2021 · Digital Image Processing means processing digital image by means of a digital computer. The specified tolerance threshold is the maximum distance from the source point. Each pixel contains the distance to the closets border pixel (Number 1 on the above image). Image acquisition is the first step of the fundamental steps of DIP. The main idea behind pseudo color transformation is to perform three independent transformation (RED Oct 29, 2018 · Success rates also vary by company size. Find answers and resources to common questions. At the bottom of the screen, tap on the Effects menu and select Glitch. Image Compression. trainings and boost productivity. Drop photo in tool, preview it in the container, then adjust photo by click on plus or minus button continuosly till photo is straightened. Choosing a good distance metric becomes really important here. Mar 03, 2020 · Microsoft Surface in use in the Vikings Draft Room. rotation The image displacement is always along radial lines from the principal point of a truly vertical photograph or the nadir of a tilted photograph. 23. What would the following shapes become after a projective transformation. At organizations with fewer than 100 employees, respondents are 2. Download Download PDF. In these worksheets identify the image which best describes the transformation (translation, reflection or rotation) of the given figure. The default for the NITF (NCDRD) raster type is 2. 75*10 (B) +0. A notion of a local digital distance is wide used in image processing. These corresponding figures are formed using transformations. Digital tools for classroom like Padlet motivate students to work together and brainstorm like a team. 5 = 3 QUESTION B2 (8 marks) (a) Explain the difference between Euclidean transformation and projective transformation. Bersoft Image Measurement - Measure length, angle, segments, perimeter and area in digital images. Image A comment on “a note on ‘distance transformations in digital images’” By A. About SAIC. Jain Fundamentals of Digital Image Processing, Prentice-Hall, 1989, Chap. Learn more about our purpose, vision, and mission. Jan 10, 2021 · The first time I saw a digital picture frame in the early 2000s, it was frankly kind of tacky, with a pixely screen and obnoxious, PowerPoint style animated transitions between images. Image processing mainly include the following steps: 1. Royal Institute of Technology. Here's how it works: The locations of two GPS receivers--one stationary, one mobile--are illustrated below in Figure 5. b) State and explain various applications of digital image processing 10) a) Explain the functioning of CCD line scan sensor and CCD area sensor. Name it. A figure can be flipped over a line. Multiple lens systems. from-image. Once the input is attained, system processes the image using different efficient algorithms and gives an image as an output. In this case, the rule is "5 to the right and 3 up. Cite . An answer key is provided. Don't Let IT Complexity Hamper Your Digital Goals Get our new ebook, "Stop Fighting Digital Transformation," to learn more about simplifying automation across your organization Apr 21, 2016 · Dari ketiga tahap pengolahan citra digital di atas, dapat dinyatakan suatu gambaran mengenai teknik-teknik pengolahan citra digital dan macam-macamnya, antara lain sebagai berikut (Basuki, 2005:11): Image enhancement, berupa proses perbaikan citra dengan meningkatkan kualitas citra, baik kontras maupun kecerahan. the same distance A translation can move a figure and/or Translations are also thought of as and 1. Price: $11. 7 3. point transfor Dec 09, 2011 · 9) a) Distinguish between digital image, and binary image. From there, we simply draw the bounding box around our marker and display the distance on Lines 50-57 (the boxPoints are calculated on Line 50 taking care to Line Detection by Hough transformation 09gr820 April 20, 2009 1 Introduction When images are to be used in diﬀerent areas of image analysis such as object recognition, it is important to reduce the amount of data in the image while preserving the important, characteristic, structural information. May 12, 2017 · For a further introduction to the digital supply network, see The rise of the digital supply network: Industry 4. Explore SAIC jobs and apply at our Careers site. As the spread of COVID-19 causes schools—particularly colleges and universities—to switch to distance education, it is a good time to review an important part of the educational landscape: copyright. Differential Correction. 43. Write the Type of Transformation. Distance Transformations in Digital Images GUNILLA BORGEFORS National Defence Research Institute, Box 1165, S-581 l l Link5ping, Sweden Received September 10, 1985; revised February 6, 1986 A distance transformation converts a binary digital image, consisting of feature and Six different distance transformations, both old and new, are used for a few different applications, which show both that the choice of distance transformation is important, and that any of the six transformations may be the right choice. Before the current COVID- health, education, social and economic crisis, the most visible uses of emerging technologies, such as Artificial Intelligence The projective transformation can warp lines so that they remain straight. Translate the figure 5 units left and 2 units down. In this tutorial, different ways to apply pseudo color transformation to a gray scale image will be discussed along with the MATLAB Code. 25*10 = 10 (Explained in the Algorithm above) Now, for P1 apply linear interpolation between A and B with the weights fy as 0. The red lines show some corresponding points. The x-axis of the histogram is the range of the available digital numbers, i. 7 times more likely to report a successful digital transformation than are those from organizations with more than 50,000 employees. Maximum Number of Pairs for Each Image Based on Similarity: Maximum number of image pairs with similar image content. One can be interested on computing the distance map only on the inner side of an Jan 08, 2013 · Use the OpenCV function cv::filter2D in order to perform some laplacian filtering for image sharpening. Image Restoration and Reconstruction. YouTube. Jan 01, 1989 · A Comment on a Note on Distance Transformations in Digital Images: Published in: Computer Vision, Graphics and Image Processing, 47(1), 89 - 91: Author: Digital Image Processing Second Edition. Digital transformation projects made successful. Some of the operations covered by this tutorial may be useful for other kinds of multidimensional array processing than Jan 19, 2015 · Then, for each image in the list, we load the image off disk on Line 45, find the marker in the image on Line 46, and then compute the distance of the object to the camera on Line 47. Infosys. The DT combines numerical features and object shapes. You’ll learn the basics of digital transformation requirements, explore major pitfalls that cause 70% of digital efforts to Spatial data has coordinate systems, geographic coordinate systems, or projected coordinate systems defined. It turns out that the 2-D FT of 1/r is Oct 25, 2021 · Landsat surface reflectance (SR) data are available in Earth Engine as a copy of the USGS Collection 2, Level 2 archive. png --width 0. 75*10 (right) + 0. Most of the time, we view these pixels as miniature rectangles sandwiched together on a computer screen. flip Any image in a plane could be altered by using different operations, or transformations. 34, No. Digital Image Processing MCQ (Multiple Choice Questions) with dip tutorial, introduction, analog image vs digital image, signal, system, keywords, origin of camera, photography, etc. 5 (since 2 * 1. Dilation is when we enlarge or reduce a figure. It is useful to examine the image Histograms before performing any image enhancement. In this paper we concern structuring element as oriented Oct 23, 2012 · Application of the Extended Distance Transformation in digital image colorization Application of the Extended Distance Transformation in digital image colorization Lagodzinski, Przemyslaw; Smolka, Bogdan 2012-10-23 00:00:00 Multimed Tools Appl (2014) 69:111–137 DOI 10. Give the three basic transformations 3. Analog and digital signals are the types of signals carrying information. Join SAIC. On the other hand, digital image coordinates typically have their ori-gin at the lower-left corner of the image. For example - Face recognition, Censored Images online, Retail Catalog, Recommendation Systems etc. In this stage, an image is given in the digital form. Terabee are leaders in Time-of-Flight sensing. Photo straighten tool, helps to adjust bended or curved photo in a simple steps. 4. Below are some of the types of transformations. Only one transformation changes the orientation of the figure in one step. Fourier transform can be generalized to higher dimensions. Download Full PDF Package. Bersoft Image Measurement runs under Windows 9. David Kang + 10 More. In this paper we concern structuring element as oriented Digital mathematical morphology (MM) and the distance transform (DT) have many points of intersection. Increase in user-interactions within 6 months 20%. Specific information about this operator may be found here. Usual application of mathematical morphology uses distance transforms based on the trivial city-block or chessboard metrics like digital representation of continuous ball. 1007/s11042-012-1246-2 Application of the Extended Distance Transformation in digital image colorization Przemyslaw Oct 21, 2007 · Digital image colorization based on distance transformation Digital image colorization based on distance transformation Lagodzinski, Przemyslaw 2007-10-21 00:00:00 On hierarchical edge matching in digital images using distance transformations (TRITA-NA. In other words, it adds knowledge of relative location, i. Differential correction is a class of techniques for improving the accuracy of GPS positioning by comparing measurements taken by two or more receivers. e. Bigger traffic to knowledge base x10. 1. L. You can see how six parameters define how a raster's rows and columns transform into map coordinates. (3) a straight line. The magnitude of relief displacement is given by the formula d rh (10-6) H where d = image displacement r = radial distance from the principal point to the image point H = flying height above ground Sep 02, 2014 · We have made some Computer Graphics & Digital Image Processing MCQS (Mulitiple Choice Questions) which helps to prepare for competitive exams and various university exams or btech computer science 6th sem exams. If you want the screen in front of you to spin about a point in the center, rotate around Out , or multiply the transform by R Zrot . Two-dimensional Fourier transform also has four different forms depending on Aug 23, 2021 · At its highest level, spatial computing is the is the virtualization of activities and interactions between machines, people, objects, and the environments in which they take place to enable and optimize actions and interactions. Full PDF Package Download Full PDF Package. The multiyear expansion aims to help the entire NFL, including its coaches and players, be more […] The first-order polynomial transformation is commonly used to georeference an image. Geometric transformations are one of the most common transformation operations that feature in any image processing pipeline. The formal definition of a translation is "every point of the pre-image is moved the same distance in the same direction to form the image. py script, just issue the following command: $ python object_size. Thin lens equation and problem solving. This might be usefulgate preparation too. The most basic transformation is the translation. 5% accuracy. Give suitable example to each type of images. Image Acquisition. Jul 12, 2018 · Digital transformation in education: The challenges “The biggest impediment to a company’s future success is its past success. A graph is provided with the pre-image. In this paper we consider a generalization of distance transforms to arbitrary functions on a grid rather than binary-valued ones (i. WPP agencies collected a total of 190 Lions, including a Titanium Lion, 12 Grand Prix, 28 Gold, 57 Silver and 92 Bronze, with winners representing 38 different countries. A distance transformation converts a binary digital image, consisting of feature and non-feature pixels, into an image where all non-feature pixels have a Distance transformations in digital images. Discover our people, culture, and communities. A transformation is a way of changing the size or position of a shape. Contact Us. Oct 08, 2021 · 10 Best Digital Transformation Courses [2021 NOVEMBER] [UPDATED] 1. We set out to shape this future with what we call “highly assisted imaging”: X-ray imaging in which intelligent technology leverages the system’s and user’s full potential, regardless of who performs the examination, regardless of time, and regardless of the system or location. Cloud spending in the first quarter of 2020 was nearly triple that of the previous year, and by November, 70% of companies using cloud had plans to increase spending due to the disruption. 6. Sep 29, 2020 · Following a slow, two-decade march toward more digital business models, higher education’s overdue technological transformation has been rapidly accelerated by the events of 2020, and centers Right-click (Win) / Control-click (Mac) on the Type layer. May 04, 2021 · Getting Started with Digital Transformation. 6. The histograms of the three bands of this image is shown in the following figures. But here's the problem. What is Digital Image Processing? •Digital image processing focuses on two major tasks – Improvement of pictorial information for human interpretation – Processing of image data for storage, transmission and representation for autonomous machine perception •Some argument about where image processing ends and fields such as image Is video me aap ko gray level transformation k baare me bataya gaya h aur kyon kyon se types present h gray level transformation me jaise ki 1. Generally, in this stage, pre-processing such as scaling is done. In the education industry, the target customer can be student, faculty, staff and alumni and digitizing the education sector can benefit both students and faculty. For example, many signals are functions of 2D space defined over an x-y plane. Print. In doing so, lines which were once parallel may no longer remain parallel. Students can use colored pencils to graph the additional images. Each grid has the figure and the image obtained after transformation. 955. This Paper. turn. Computing these distances is in principle a global operation. straighten photo. location with respect to other locations, to expand the This algorithm computes the medial axis transform of an image as the ridges of its distance transform. a) Discuss the advantages and disadvantages of global and local histogram equalization. A1: Through a digital computer, manipulating digital images is knows as digital image processing. " Take a look at the picture below for some clarification. Similarly, repeat for other pixels. Distance map. A maps an initial image, called a preimage, onto a final image, called an image. Color Image Processing. suitable for the whole class to use. 25*10 (A) = 10. flip. Every point in the image is the same distance from the mirror line as the original shape. Importing the image via image acquisition tools; •We can think of a (grayscale) image as a function, f, from R2 to R (or a 2D signal): –f (x,y) gives the intensity at position (x,y) –A digital image is a discrete (sampled, quantized) version of this function What is an image? x y f (x, y) snoop 3D view Feb 06, 2007 · The iPhotoMEASURE software uses the DigiTarget to compute the measurements of items in your photo and the company claims that any distance in the picture can be measured with up to 99. 0 to 255. Here are the most common types: Translation is when we slide a figure in any direction. Default initial value. 99. A short summary of this y, describe how image plane and digital image coordinates can di er by a translation. Consider the image segment shown. BibTex; May 20, 2020 · Photo by Payton Tuttle on Unsplash. In today’s post we would look at three of these transformations: rotation, translation and scaling and then build them up from scratch using only Numpy. Digital Transformation (MIT Professional Education) If you want to equip yourself with the digital transformation techniques like AI, Internet of Things, Cloud Computing, Blockchain, and Cybersecurity, then this is the ideal course for you. There is a simple intuition Oct 29, 2021 · Udemy: Defining a Digital Transformation Roadmap. Ideal for grade 5 and grade 6 children. The world of radiology is changing – and we have a clear vision of its future. The difference between analog and digital signal can be observed with the various examples of different WPP wins industry’s most creative company at Cannes Lions. Digital transformation offers organizations an opportunity to understand the modern-day buyer, engage with them and deliver on their expectations with a multi-channel customer experience. Filtering in Frequency Domain. b) The following ﬁgure shows (a) a 3-bit image of size 5-by-5 image in the square, with x and y coordinates speciﬁed, (b) a Laplacian ﬁlter and (c) a low-pass ﬁlter. A comment on "A note on distance transformation in digital images" Published in: Computer Vision, Graphics, and Image Processing, 47, 89 - 91. distance transformations in digital images

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