Questions tagged [image-processing]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
35 views

Logging OpenCV Mats [closed]

We'd like an abstraction for writing images (OpenCV Mats) to disk for diagnostic purposes during image processing. As we currently use the Serilog logging library (through ILogger in Microsoft....
1
vote
1answer
236 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 ...
-1
votes
2answers
1k 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 ...
2
votes
1answer
106 views

Can Mean Shift Algorithm 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 ...
-3
votes
1answer
70 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.
2
votes
1answer
115 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 ...
0
votes
1answer
157 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 ...
4
votes
3answers
149 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 ...
0
votes
2answers
1k 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 ...
1
vote
0answers
775 views

How to improve detection of Probalistic Hough-Lines-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 ...
1
vote
1answer
502 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 ...
1
vote
2answers
96 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 ...
2
votes
2answers
1k 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 ...
1
vote
3answers
355 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 -...
0
votes
1answer
4k 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 ...
0
votes
1answer
76 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 ...
2
votes
0answers
669 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 ...
6
votes
2answers
422 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 ...
1
vote
1answer
4k 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.
1
vote
1answer
56 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 ...
-4
votes
2answers
413 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. ...
6
votes
1answer
974 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 ...
-2
votes
2answers
153 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 ...
6
votes
1answer
2k 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 ...
0
votes
1answer
101 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 ...
1
vote
2answers
937 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,...
1
vote
3answers
474 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 ...
2
votes
0answers
58 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....
6
votes
1answer
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 ...
0
votes
0answers
111 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 ...
1
vote
1answer
1k 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 ...
1
vote
1answer
738 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 ...
1
vote
1answer
150 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 ...
5
votes
0answers
240 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 ...
2
votes
1answer
138 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 ...
0
votes
1answer
75 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 ...
1
vote
1answer
429 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? ...
3
votes
1answer
84 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 ...
3
votes
1answer
195 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 ...
3
votes
1answer
1k 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 ...
2
votes
0answers
361 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 ...
2
votes
2answers
7k 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 ...
4
votes
2answers
150 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 ...
2
votes
2answers
914 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 ...
4
votes
1answer
1k views

Getting started with object detection - Image segmentation algorithm

Just getting started on a hobby object-detection project. My aim is to understand the underlying algorithms and to this end the overall accuracy of the results is (currently) more important than ...
4
votes
1answer
308 views

How to maintain standard quality of images uploaded by many users?

We're developing a site where individuals (store owners) will be able to take pictures and upload to the site. Our biggest concern is the variance in quality of pictures across the site. The options ...
4
votes
1answer
964 views

Stereo images rectification and disparity: which algorithms?

I'm trying to figure out what are currently the two most efficent algorithms that permit, starting from a L/R pair of stereo images created using a traditional camera (so affected by some epipolar ...
2
votes
1answer
138 views

Algorithm for deciding change in gesture

I am developing an application where I am taking dynamic gestures as input and then mapping them to keyboard controls. By dynamic gesture, I mean for example hand moving from left to right or hand ...
12
votes
1answer
3k views

Computational Complexity of Correlation in Time vs Multiplication in Frequency space

I am working with 2d correlation for image processing techniques (pattern recognition etc...). I was wondering if there is a theoretical approach on how to tell when to use multiplication in frequency ...