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1
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1answer
58 views

Use camera to analyze homogeneity

We are working with some screens whose in the production process change their state from a transparent state to a colored state. This colored state is achieved to block light transmittance. In this ...
-2
votes
0answers
24 views

how to read and write a ppm in Java [migrated]

I'm solving old exams. In Java, I would like to open an image file input.ppm, convert it to greyscale, and save it as output.ppm. So I have to read all its contents (RGB information for each pixel), ...
1
vote
1answer
95 views

What are the most appropriate algorithms for downscaling images extremely while maintaining recognition?

I want to create a window icon (128x128 at most, the icon in the corner of the window on Windows is 24x24, I believe) from a large image (1024x768 and more). I've tried several algorithms - nearest ...
0
votes
1answer
186 views

Image Processing in browser is too slow on Android compared to that with desktop browser [closed]

Situation I've written a simple black and white image filter application with JavaScript using html5 canvas. Here is an example of the app . (I don't know why it does not work in jsfiddle, so I gave ...
1
vote
1answer
84 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? ...
0
votes
1answer
64 views

How to integrate and Program Avatar customization in HTML(5)? [closed]

I am making a Game in HTML5. In one part of it, I want the users to be able to customize the avatar they get by default. For sample, let me share a screenshot from Zombie Lane on Facebook (now this ...
0
votes
2answers
117 views

Help me understand how to index a pixel in an image

I had a look at the code for the implementation of this paper Graph-Based segmentation by Pedro F. Felzenszwalb But I didn't understand how in the below code that y * width + x is used to build a ...
1
vote
2answers
1k views

Dataset with coordinates of borders of countries [closed]

I am creating an application that visually displays world regions, e.g. to place markers within an administrative region. Does a dataset exist with geometrical or geographical (long/lat) descriptions ...
10
votes
1answer
2k views

What is the current status of software support for JPEG-2000?

The general recommendation to record original scanned images used to be "use TIFF". But programmers need evolution of format for "evolution of software", and I need to evolve my system to change from ...
2
votes
1answer
160 views

What is watershed in the context of image processing?

I am new to image processing using Python. Now I am learning OpenCV and the mahotas module in Python. Many functions in these modules are related to watershed of an image. I don't know what ...
3
votes
1answer
899 views

Extracting color profile information from JPEG files

I'm trying to look up info about reading JPEG's color profile info and to my surprise there's very little open specific how-to information on that regard, but rather lots of general explanation on ...
8
votes
4answers
662 views

Annotate source code with diagrams as comments

I write a lot of (primarily c++ and javascript) code that touches upon computational geometry and graphics and those kinds of topics, so I have found that visual diagrams have been an indispensable ...
7
votes
2answers
193 views

Resizing an image with a non-integral conversion factor

I'm resizing an image based on a non-integral conversion factor (a bmp image, in fact). I understand how resizing works, just non with a decimal number. For instance, if the factor were 2, I would ...
2
votes
1answer
566 views

Drawing shapes dynamically on an image through web browser [closed]

We have a scenario where we create floor plans of locations when we visit. The floor plan is finally shown on the web. It's come to the point now where we want to show floor plans but have a key with ...
0
votes
2answers
689 views

2D Image Creator for a video game

I need to make a few images for an arcade video game I'm making in Java. As of right now, I have drawings that animate, but there are two problems. The drawings are horrible, and as a result, the ...
1
vote
2answers
2k views

Store HighRes photos in Database or as File?

I run a site which has a couple of million photos and gets over 1000 photos uploaded each day. Up to now, we haven't kept the original file that was uploaded to conserve on space. However, we are ...
2
votes
2answers
679 views

Storing images in file system and returning URLs or virtually resizing and returning byte arrays?

I need to create a REST web service to manage user submitted images and displaying them all in a website. There are multiple websites that are going to use this service to manage and display images. ...
4
votes
2answers
2k views

How image editing software change image contrast?

How Photoshop or other image editing software change an images contrast? What contrast mean when we process image pixel by pixel? Or what image contrast means? Here I created a very basic image to ...
6
votes
3answers
2k views

Is CSS resizing of images still a bad idea?

It's always been looked at that using width/height attributes on images which aren't what the original image actual is is a bad idea. It could mean pixalated images or download sizes bigger than ...
0
votes
4answers
2k views

What is the easiest way of viewing an RGB byte array as an image? [closed]

I have a byte array stored in a file. I want the quickest, easiest way of viewing the image whether it is writing code or using a utility or web page.
6
votes
2answers
817 views

Image color/grayscale classification

I am trying to classify a set of images into grayscale or color groups. I have been using ImageMagic to do that, comparing the color image to a grayscale version of itself and then using the Peak ...
2
votes
4answers
284 views

Do paint programs also need database?

I was thinking about how would a paint software works. Firstly I thought that it might not use any database but when I started thinking about the undo function I realized that it might be that the ...
3
votes
3answers
6k views

Which is better : Storing/retrieving images on/from SQL server or in a directory on server

I am working on a project in Asp.net MVC and need to work with images. There is an SQL database with a Product table. Every product in the table will have it's own image. I have two ways to do this : ...
9
votes
5answers
3k views

What's the best way to learn image processing? [closed]

I'm a senior in college that hasn't done much image processing before (except for some basic image compression on smartphones). I'm starting a research project on machine learning next semester that ...
6
votes
1answer
552 views

What factors should I be looking at to increase performance in image resizing?

I'm setting up a web app in which people will upload images. Once uploaded the images will be watermarked then resized multiple times (Thumbnails, different sizes etc.) and finally uploaded to Amazon ...
2
votes
1answer
198 views

why is it easy to break verification images if they are not distorted to the extent that humans can get them wrong too?

I don't understand why people like to say "Images had to be distorted otherwise they would be easily cracked". I'm talking about those verification images that we had to type to identify that we are ...
13
votes
5answers
4k views

How to know if two images are the same?

I have over 10000 images which about 2000 are duplicates in other formats (as in JPEG, PNG, GIF). Both of these numbers are increasing every day. I need to delete those duplicates and for that I must ...
6
votes
3answers
2k views

Best practice- handling images on website

I am porting an old eCommerce site to MVC 3 and would like to take advantage of design improvements. The site currently has product images stored in 3 sizes: thumbnail, medium (for display in a list) ...
1
vote
1answer
409 views

Does anyone have any experience with scene7 image server? [closed]

Scene7 is Adobe's image server. It seems like many people are using it. We are considering using it. I want to know the developers experience. Was a pain to develop with or did it make things easier? ...
4
votes
2answers
357 views

Online medical image processing grand challenges [closed]

I'm currently working on my thesis, and I'm looking for an/some online medical image processing grand challenge(s). I already know this site but I need a challenge which has microscopic image dataset ...
3
votes
6answers
226 views

Could anyone suggest me some image manipulation techniques to be added to my image viewer?

I'm trying to develop a small image viewer just as an exercise to sharpen my programming skills. So far , all the features that I could think of adding to it are zooming in and out, inverting the ...