image-processing

Resized images not smooth in flex

I am loading images in flex 3.0 , but when they are resized they look grainy and distortered . Can i give some sort of effect or dsomething to fix this .thanks ...

Image Recognition Library

I wonder whether there is any competent image recognition library ( preferably open source) in .Net? I have an application that scans pages and documents in batches. In order to separate one document from another ( for these documents could have multiple pages), I plan to ask users to put a page, with a say, polar bear image on it to sep...

LockBits Performance Critical Code

I have a method which needs to be as fast as it possibly can, it uses unsafe memory pointers and its my first foray into this type of coding so I know it can probably be faster. /// <summary> /// Copies bitmapdata from one bitmap to another at a specified point on the output bitmapdata /// </summary> /// <param name="sou...

Deface images and apply filters

Exact duplicate of Photo application Hi people. I'm developing an application, just for fun, that consists of capturing the image from a webcam. What I would like to know is: How can I apply some filters to the image that make things like iPhoto programm from Apple. Things like defacements, etc. I'm using C# as programming langu...

Blind deconvolution algorithm question

I was studying deconvolution, and stumbled upon Richardson-Lucy deconvolution, I was thinking of writing a simple program to do post-processing using this method, does anybody know where I can find complete implementable algorithms or source code that I can study and play around with? Preferably in C++ language or matlab. I have r...

Differences between AForge and OpenCV

Hello, I am just learning about computer vision and C#. It seems like two prominent image processing libraries are OpenCV and AForge. What are some of the differences of the two? I am making a basic image editor in C# and while researching I have come across articles on both. But I don't really know why I would choose one over the othe...

DirectX and OpenCV

So i have a program written already that captures the image from a webcam, into a vector called pBuffer. I can easily acess the RGB pixel information of each pixel, simply by pBuffer[i]=R;pBuffer[i+1]=G;Buffer[i+2]=B. No problem in here. The next step is now create an IplImage* img, and fill it in with the information of the pBuffer......

Rails can't find image_magick gem

I am trying to use image_magick gem to process image uploads, but rails can't locate it. I have installed the gem successfully using: gem install mini_magick-1.2.3.gem --local gem update system gem cleanup and my model has require 'rubygems' require 'mini_magick' However, I still get the error: no such file to load -- mini_magic...

How to serve high-resolution imagery in a low-resolution form using C#

Trying to use 300dpi tif images for display on the web. At the moment, when the user uploads an image, I am dynamically creating a thumbnail. If a page is created referencing the high-res image with a width of 500x500px, can I use the same functionality to convert to a gif/jpg on the fly. What is the impending resolution of the jpg that ...

Convert jpg image to gif, png & bmp format using PHP

Hi all, How can I convert a single jpg image into 3 different image format gif , png and bmp using PHP? Pls help ...

Looking for trustworthy JPEG batch converter/resizer

I have a batch of PNG files that I need to convert to JPEG. I'm looking for a free trustworthy utility that will give me the most optimal possible JPEGs. I've found some paid utilities and i HAVE Photoshop, but I want something dedicated that is made for the task and I dont want to accidentally download spy ware. I'm really surprised n...

Problem with Array type "DAMPAR" in MATLAB deconvolucy.m

Below is part of the code that i tried to edit from, MATLAB's deconvolucy. it appears to have problem with DAMPAR where the class type does not match. can anyone help or does anyone know a better way to call in an image that I (as in deconvolucy.m) would tolerate? [perhaps i should convert the image into array before use? how do i do ...

Using BitmapFrame for metadata without locking the file

I've found the common way to get image metadata in WPF is to create a BitmapFrame object and inspect the Metadata property on it. However I can't seem to create a BitmapFrame object that fulfills these two requirements: Does not lock the file Does not throw weird, undocumented exceptions when given certain files Using these lines see...

What Java Library can I use to search for colours, with a tolerance, in an image?

I would like to find a Java library that will allow me to search for colours within an image with a tolerance. Preferably quickly. I know how I would do it if I had to write it myself, and it's not super difficult, but I'm hoping to find a library with features other than that principle one. I'd like to be able to also: Find another im...

How do image hosting sites enforce content policies?

I'm trying to figure out how to best implement a public data hosting service. How do websites that let users upload pictures enforce their terms of service regarding obscene pictures? Do they use image processing algorithms to flag potential violations (too many skin-colored pixels)? I think Imageshack looks at the websites that their...

How to handle big images with C#.

I get Insufficient Memory when try to load images like 20 Mb in jpg or 200 Mb in bmp ...

Editing checkboxes in a Matlab GUI

Using the GUI guide editor in Matlab 2008b, I have run into a problem with check boxes. I have looked at numerous online tutorials and such but haven't found a solution. My problem is that I have a button that resets everything in the GUI (editing a picture). However, there are checkboxes in my GUI and I can't figure out how to desele...

Using WPF Imaging classes - Getting image dimensions without reading the entire file

Hi guys Link this post I want to be able to read an image files height and width without reading in the whole file into memory. In the post Frank Krueger mentions there is a way of doing this with some WPF Imaging classes. Any idea on how to do this?? Cheers Anthony ...

how to sketch a polygon in a matrix or binary image in order to use image processing functions?

I'm developing a matlab program in which I uses polygons(concave or convex). I need to use image processing functions like imdilate or imerode and etc on the polygons. To this end, I should convert my polygons to image. I wonder whether there is a way to sketch a polygon directly in a binary matrix (1's for foreground and 0's for backgro...

Liquefy filter/iwarp

I'm trying to build something like the Liquefy filter in Photoshop. I've been reading through image distortion code but I'm struggling with finding out what will create similar effects. The closest reference I could find was the iWarp filter in the Gimp but the code for that isn't commented at all. I've also looked at places like ImageM...