Questions tagged [image-processing]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2 votes
2 answers
116 views

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 ...
user avatar
  • 129
0 votes
1 answer
69 views

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 ...
user avatar
  • 358
2 votes
0 answers
337 views

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" ...
user avatar
  • 2,412
2 votes
3 answers
169 views

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 ...
user avatar
  • 357
2 votes
1 answer
102 views

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 ...
user avatar
  • 2,412
1 vote
1 answer
108 views

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 ...
user avatar
  • 23
3 votes
1 answer
118 views

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, ...
user avatar
2 votes
1 answer
5k views

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 ...
user avatar
-1 votes
2 answers
7k views

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 ...
user avatar
2 votes
1 answer
374 views

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 ...
user avatar
-3 votes
1 answer
87 views

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.
user avatar
2 votes
1 answer
443 views

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 ...
user avatar
  • 53
0 votes
1 answer
321 views

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 ...
user avatar
4 votes
3 answers
233 views

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 ...
user avatar
  • 151
1 vote
2 answers
4k views

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 ...
user avatar
2 votes
0 answers
1k views

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 ...
user avatar
1 vote
1 answer
578 views

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 ...
user avatar
1 vote
2 answers
121 views

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 ...
user avatar
  • 119
3 votes
2 answers
2k views

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 ...
user avatar
1 vote
3 answers
384 views

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 -...
user avatar
-1 votes
2 answers
8k views

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 ...
user avatar
0 votes
1 answer
78 views

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 ...
user avatar
  • 121
3 votes
0 answers
761 views

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 ...
user avatar
6 votes
2 answers
440 views

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 ...
user avatar
  • 199
1 vote
1 answer
6k views

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.
user avatar
1 vote
1 answer
80 views

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 ...
user avatar
  • 3,831
-4 votes
2 answers
575 views

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. ...
user avatar
6 votes
1 answer
2k views

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 ...
user avatar
-2 votes
2 answers
164 views

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 ...
user avatar
7 votes
1 answer
4k views

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 ...
user avatar
  • 209
0 votes
1 answer
125 views

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 ...
user avatar
1 vote
2 answers
1k views

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,...
user avatar
1 vote
3 answers
560 views

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 ...
user avatar
3 votes
0 answers
61 views

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....
user avatar
  • 263
6 votes
1 answer
1k views

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 ...
user avatar
0 votes
0 answers
112 views

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 ...
user avatar
2 votes
1 answer
3k views

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 ...
user avatar
1 vote
1 answer
896 views

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 ...
user avatar
1 vote
1 answer
166 views

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 ...
user avatar
5 votes
0 answers
243 views

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 ...
user avatar
  • 67
2 votes
1 answer
141 views

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 ...
user avatar
0 votes
1 answer
91 views

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 ...
user avatar
1 vote
1 answer
611 views

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? ...
user avatar
  • 145
3 votes
1 answer
97 views

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 ...
user avatar
  • 779
3 votes
1 answer
217 views

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 ...
user avatar
2 votes
1 answer
2k views

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 ...
user avatar
  • 583
3 votes
0 answers
423 views

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 ...
user avatar
3 votes
2 answers
9k views

Algorithm for searching images within images [closed]

I can't google this question, because I can't come up with a good query, so let me describe what I want and maybe someone will be able to suggest a way forward for me. I need to solve the following ...
user avatar
3 votes
2 answers
158 views

Can I use machine learning for screening experimental data?

I am a experimental physicist. In our research, we have our experimental data in a 400*400*400 matrix(x, y, z axis of a 3d space), each entry is associated with a value("brightness"). We expect the ...
user avatar
2 votes
2 answers
1k views

Effective and simple matching for 2 unequal small-scale point sets

I need to match two sets of 3D points, however the number of points in each set can be different. It seems that most algorithms are designed to align images and trimmed to work with hundreds of ...
user avatar