Questions tagged [image-processing]
The image-processing tag has no usage guidance.
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How to optimize Media Uploads for a Web App: Client-side Compression & Architecture Resources? [closed]
I'm working on a new web app that allows users to upload images and videos and share them with others. I'm primarily looking to optimize the upload process and have a couple of questions:
Client-side ...
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126
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Optimizing algorithm for categorizing pictures of Magic the Gathering Cards by type? [closed]
I'm making a piece of software that is able to recognize Magic the Gathering Cards from a picture or the actual camera.
The codebase scans for rectangular shapes (cards) in an image and calculates ...
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2
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162
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Encoding text to image and decoding back to text
(FYI: I asked this question on stack overflow and was directed here)
My problem is as follows:
I have a dashboard running on a server at customer premises which updates every 15 minutes
The dashboard ...
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2
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2
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205
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Implementing a method to achieve faster image acquisition
I hope I can explain my question clearly. I'm planning to do some real time 2D grayscale image acquisition, and after reading some articles, I noticed that many are using buffers or multithreading or ...
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71
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Detecting whether a background image is "too light" to display white text over
I am building a mobile client app that gathers info about movies/TV shows from a website and displays it in a pretty format. When the user clicks on a show, they are taken to a page with the thumbnail ...
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526
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How to OCR and/or recreate lines of Egyptian Hieroglyphs in Unicode/HTML?
I am wondering how to take these Hieroglyphs and make them into Unicode. I read through the Tesseract docs on how to create training data, but it seems largely tailored toward "traditional" ...
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209
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What is use of “DPI” of a “image file” while viewing it on a display?
Display devices have their own PPI.Do these devices respect the DPI information of image file? If not, then what is use of"DPI" of image file?
example:
Image file- height: 1200 px width: 900 ...
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133
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How to create a T-shirt or book displacement map in practice?
So I learned that the feature I am interested in is called a "displacement map". This makes it so you can take a blank t-shirt (with all it's curves and subtle textures), and apply an image to it so ...
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246
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How should I approach the comparison of two BMP images?
I am currently writing a Python program that retrieves the pixels from two BMP files and finds the percent difference between them (without using the Pillow library for the purpose of learning). I can ...
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157
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How to guess which pieces of text belong to which lines in a scanned document?
I want to be able to analyze a five-years archive of supermarket receipts. The receipts are scanned, and thanks to Google Cloud Vision API, the result of an OCR is available. Google's API, however, ...
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How to Define the Bandwidth in Mean Shift Clustering?
I am making a program using Java todo colo quantization using mean shift clustering algorithm and the image is RGB with resolution of 512x512. I want to reduce the image file size by reducing the ...
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How do I extract only bold text from this image? [closed]
I am looking for an approach / algorithm for using OCR (like Tesseract) to extract only bold text from an image. The Python code I wrote can already identify small letters and numbers, but it cannot ...
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524
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Can the Mean Shift Algorithm be used in color quantization?
I have a problem with deciding algorithm for color quantization. The image that I want to do color quantization is an RGB image with resolution 512 x 512. I want to reduce the color value in the pixel ...
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Low resolution Image to High resolution
Is it possible to scale a low resolution image to a highier resolution upto the point with minimum effect on quality, sharpness and other notable attributes of an image.
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559
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What techniques are there to detect the objects direction of travel?
I have been looking into object detection and tracking for a project that I am working on but I can't yet seem to find any techniques that I can make use of to utilise the information from object ...
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363
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How do I check programmatically if two photos show the same drawing? [closed]
Imagine a simple drawing of let's say a duck. And you have an photo of it in your database.
Now a user takes a second photo of the same drawing of the duck. What approaches exist to check if both ...
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282
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How to process large image with a minimum time lag
I am trying to create a web UI for image processing, with some operations similar to what a site like fotor.com offers. However, I have problems to achieve a similar performance. For example, lets say ...
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Best way to design file storage for image processing system
Would appreciate any recommendations regarding design a high-load image processing service.
There are lots (tens of hundreds of relatively large images (~10...20 Mb each)) that to be processed using ...
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How to improve the detection of Probabilistic Hough Line Transform?
I'm trying to detect a clock hand in a video of an analogue display and extract the value it points to. I'm using Python with OpenCV for this.
What I essentially do is:
I'm using a Gaussian Blur to ...
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590
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Best approach to learn OpenCV to use with Swift? [closed]
I am trying to figure out how to use OpenCV with XCode's Swift. I need to do realtime video processing for the project I am working on, but I can't seem to find any good references on learning OpenCV ...
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187
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Comparing images and get changed areas
I am looking for an efficient way to compare 2 images and get the changed areas as a result.
My current attempt has the following steps:
Compare each horizontal line and keep the changed line index ...
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2k
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Parallel Image Processing Best Practices
When doing (possibly heavy) pixel processing on a large image, multithreading becomes a must. The standard practice is to initiate a loop whose indices are partitioned into multiple threads within a ...
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401
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How to draw high-resolution images on client-side?
Any libraries, API, or tips are welcome. I am trying to draw Landsat 8 images using Canvas utility of Javascript on my browser. The grayscale reflectance values for Landsat 8 bands are from minimum -...
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8k
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Making profit using OpenCV?
I was looking to use OpenCV to program an image recognition app for iOS. One thing I wanted to check is if I were to charge $0.99 or $1.99 for the app, would I be breaking OpenCV's license? I didn't ...
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83
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How to change an specific part of an image colour? [closed]
I'm not so sure whether this questions fits here, but I need help in this case, cause I'm searching for days to apply this.
I have a website of rugs and carpets, in this website I would like ...
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769
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Rotation logic for MNIST Handwritten Digit Dataset
I am currently applying some pre-processing to this dataset. Some of the digits are extremely rotated and I would like to know how others managed to get them 'upright'.
I have implemented something ...
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455
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How are dynamic images programmed?
I have two friends that want to create a jewelry store, focused on customized jewels. The core feature is the jewelry designer, based on a jewel model.
Here's an example of the sort of thing I am ...
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How to implement k-means algorithm on RGB Images?
I want to apply the k-means algorithm on an RGB image data-set. I don't know how to proceed. You can mention basic step by step flow to proceed. I do know basics of Image Processing & OpenCV.
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115
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File structure for storing pixels that changed from one image to another
Have two images with the same dimensions.
I want to create a file that contains information on what pixels are different between the two images. The file should also tell me the value of the new ...
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Automatically detect offensive images [closed]
I want to develop an app where users can upload an share images. I am planning to integrate a disclaimer which says that it is prohibited to upload images which contain crime, sex, insults etc. ...
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How to "de-dupe" similar lines (detected using the Hough Transform as rho/theta pairs)
I'm trying to identify an object (a cube) in a set of photos. Using Canny/Sobel/Hough I've managed to get the photo down to a set of lines that are pretty accurate; however if I plot these lines on my ...
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167
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Detecting Persons In Seats from Image [closed]
I am attempting to build an attendance program which could analyze if someone is sitting in a seat. The seats are fixed making knowing where each seat is easy, but I don't really know where to start ...
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Best practice for Restful API that perform heavy calculations (Image Processing)
We are currently developing an image processing restful api. Server performs some CPU-heavy computations image processing upon request and return the image to the client.
We want to make this a ...
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Counting lines of text and get color of a specific line in an image
check this picture out before I explain further:
How can I count the amount of lines there are from the yellow line to line #5? OCR sounds like overkill, because I don't really care what the text ...
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Simple (hand-drawn) shape recognition
As the input, program would get a set of point (x,y), along with the time a certain point was drawn. (suppose on a tablet).
Let's restrict ourselves to simple polygons.
I implemented Hough transform,...
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647
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Store generated image in database or generate it on server/client
I have been thinking what could be the fastest way to show base64/img data to the user, i could generate the data when the user is registered and then store it to database, or generate it every time ...
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Project a piece of image cut by N-vertex shape to a different N-vertex shape
I have an N-vertex shape that I cut out from an image, and I want to project it onto another shape with the same amount of vertices, but different. So, the image will get changed inside the projection....
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Kth selection routine - Floyd Algorithm 489
I have recently come across a promising Kth selection routine that reportedly outperforms quickselect the Floyd, Rivest Select routine. This Wikipedia article provides a pseudocode version which I ...
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112
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Web App - Better to load Large, low quality image or many html elements?
I'm creating a web application that is visually enormous. I'm talking 2 million pixels wide and 2 million pixels tall (about).
My goal is to show dynamically changing spots all over the site. For ...
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Most efficient way of saving images and sending them to client browser
I'm building an app where users list items for sale and they can include up to five photos for each item. I'm using Azure Blob storage for storing the images.
In my app, I'll be displaying these ...
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Image segmentation - show or hide clusters
I'm trying to make a small program in c#, that will downsample image to specified amount of colors (using K-means). Then, user will be able to hide\show colored areas(clusters) in image. I've ...
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218
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Measure and locate areas of similar value in an image
I saw this picture online and wanted to see if I could create an algorithm to give ordinary images an effect like this:
http://justinlivi.net/wp-content/uploads/2011/01/Living_In_Digital.jpg
My idea ...
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Counting Barrels / Hough Transform [closed]
i'm trying to find a way to count barrels on an image.
For this I'm using Hough Transformation.
I tried my code first recognising eyes and it works excellent. But now the problems is when i try to ...
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143
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What algorithms would suit image colour summarization?
I would like to analyse a set of hundreds of thousands of product images (clothing, electronic goods etc) and retrieve the dominant colours in each. I'm only interested in the top 3 or 4 colours. The ...
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Picking an image from a set of images that is most likely to be compelling to a typical viewer [closed]
Given a set of images on a webpage, what's a good way to pick a compelling image that is also representative of the webpage? The use case is displaying an image along with a description of a URL to a ...
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686
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Which Computer Vision / Image Processing technique would solve light imbalance in images?
Given a colour image whose light intensity is dim at the edges and bright in the middle, such as [dim bright dim], which computer vision technique would be recommended to correct this imbalance? ...
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101
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Determine how two images should be combined to produce the original image
Suppose I have two similar images as follows
Image 1 (base)
Image 2 (target)
The second image is basically a variation of the first image, except with a green oval slapped on top (indeed, I used ...
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220
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Difference in orientation of Sobel mask gives different edge detector result
I am implementing a Canny Edge detector for a class which I have based off the code found here. For the first derivative mask that I will convolve with the image, I am using the Sobel mask, although ...
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Comparing absolute values when determining zero crossing in 2D image
I am trying to implement an algorithm for finding the zero crossing (check that the signs of all the entries around the entry of interest are not the same) in a two dimensional matrix, as part of ...
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431
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Colour curves tool for "value" channel
I'm trying to write a program to read GIMP curves files and apply them to an image. I have successfully implemented the curves for the red, green and blue channels, but I can't get it working for the ...
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