• Recent
  • Compose
  • Select the "Compose" tab to start a new discussion

Determining a rectangular composite for panorama

Started by abba...@gmail.com in Image Signal Processing2 years ago

Hello I have a question regarding the creating of a mesh for warping two matching images for stitching. I have found an example of an image...

Hello I have a question regarding the creating of a mesh for warping two matching images for stitching. I have found an example of an image stitching process that uses a rectangular mesh but I can't find a reference to read up on it. The code I am talking about is at (http://www.vlfeat.org/applications/sift-mosaic-code.html). The line of code I don't get is, box2 = [1 size(im2,2) size(im2,2) ...


jpeg loss and perceptual quality -?

Started by vlya...@gmail.com in Image Signal Processing3 years ago

Was there any research on correlation between jpeg encoding loss and perceptual quality of resulting image? For example, ImageMagic "convert" can...

Was there any research on correlation between jpeg encoding loss and perceptual quality of resulting image? For example, ImageMagic "convert" can recompress existing image with 25-50% loss of quality with no visible degradation of image ( resulting in smaller image). So, how much loss can be introduced in JPEG compression without perceived loss of quality and how much storage space can be saved ...


level sets segmentation problem [3 Attachments]

Started by Esmeralda Ruiz Pujadas in Image Signal Processing4 years ago

Hi I am new in this forum so first I would like first to introduce me. I am in my first year of my phD and I have a lot to learn yet. My...

Hi I am new in this forum so first I would like first to introduce me. I am in my first year of my phD and I have a lot to learn yet. My project is related to segment the myocardium and I wanted to try with level sets to see how it works. I have implemented a paper and It fairly works not so perfect as I thought but it seems a good basis to keep working on . I attach some results of my...


hand extraction using frame difference method in MFC VS 2010 + OpenCV

Started by RABIA in Image Signal Processing4 years ago

Frame Difference in gray scale 1. I applied cvMean on original gray scale image and set as thresold So, result: http://imm.io/8x9p 2....

Frame Difference in gray scale 1. I applied cvMean on original gray scale image and set as thresold So, result: http://imm.io/8x9p 2. then i get cvMean from the cvAbsDiff() ressult that set that mean value as threshold result : http://imm.io/8x9H And, When ever i apply this cvAbsDiff() it gave me moving edges but i meed moving hand instead of moving edges. My code : http://cod...


Mapping between image pixel and spherical surface

Started by APOSTOLOS PAPAZOGLOU in Image Signal Processing4 years ago

Hi there, my name is Apostolos and I am quite new with computer vision and image processing... My question sounds simple but so far I...

Hi there, my name is Apostolos and I am quite new with computer vision and image processing... My question sounds simple but so far I have not found the right answer. I would really appreciate any trial to help me on that! Problem description: Given the f (focal length) of a camera , thegeometric size of the detector of the camera and a pixel image which was taken with that ...


FFT 2D Convolution - Question

Started by marc...@gmail.com in Image Signal Processing4 years ago

Hello, I have a question, If I'm doing the FFT Convolution the right way because I don't get the wanted results. ( I am using the kissFTT library...

Hello, I have a question, If I'm doing the FFT Convolution the right way because I don't get the wanted results. ( I am using the kissFTT library for c ) I load an image from a file. I filter out the argv values and put them into two arrays ( ar[] and gb[] ) they look like this: ar[0].r = alpha; ar[0].i = red; gb[0].r = green; gb[0].i = blue; Now let's say the image has a size of 51...


Re: face detection and recognition algorithm for video surveillance

Started by vina...@gmail.com in Image Signal Processing4 years ago 1 reply

Hi, For the algorithms part, you can try using the eigen face decomposition method. i am trying to build a face detection and recognition...

Hi, For the algorithms part, you can try using the eigen face decomposition method. i am trying to build a face detection and recognition algorithm for > video surveillance in matlab6.5 but i am totally newbie in matlab. I > would like to know what is the best language to write this algorithm > c,c++, java or matlab? > > can anyone pls mail me some algorithm on this as a refrence to study


Function of filtering

Started by M in Image Signal Processing4 years ago

//HELLO, I am working on a project in ' Despeckling of medical ultrasound images ',= which i need to compare my porposed filter with other...

//HELLO, I am working on a project in ' Despeckling of medical ultrasound images ',= which i need to compare my porposed filter with other filters like Gamma, = GenLik method, TLS-denoise method ,lee,kuan,frost, =85 . I need these filte= rs functions that are used in my paper but I cant find and get them. whould= you please help me How I can get this functions. // /I will wating for you...


Object recognition: Haar-like features

Started by got2getcrackin in Image Signal Processing4 years ago

Hi all I am doing a project on object recognition using live video stream from a webcam and have come across the haar-like feature/adaboost...

Hi all I am doing a project on object recognition using live video stream from a webcam and have come across the haar-like feature/adaboost algorithm. I am slightly confused as to how to implement haar-like features in MATLAB. Can anyone be of assistance please? Maybe point me to a resource that could explain. All the information I have found so far relates to OpenCV...:( Looking f...


Removing Perspective distortion

Started by fubu...@gmail.com in Image Signal Processing4 years ago

Hello, I am working on a project in which i need to create a panorama by taking images from a PTZ camera. The problem I am facing is when I...

Hello, I am working on a project in which i need to create a panorama by taking images from a PTZ camera. The problem I am facing is when I capture two images at different angles, the overlapping region between the two images have perspective distortion. So to remove it, I thought of bringing both the images in same plane and then compare and stitch them. To bring the images in same plane I t...


Sign up
or Sign in
?>