In general, image processing is any form of signal processing for which the input is an image, such as a photograph or video frame.

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11 views

Canny non-max suppression intro

I have reach experience signal-processing, but haven't touched image processing since my happy university days... so: Working on a side project, I need to enhance ridges (continuous lines) in a 2D ...
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15 views

Image objects dispersion and diversity measures

I have images like below: I want to find some measures describing black spots dispersion and diversity. First measures I use are mass center off all black spots, mean area of spot, stdev of area ...
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1answer
24 views

3D effects like HTC One Dimension plus

Its true that HTC one M8 uses dual camera to achieve the 3D Dimension plus effect, but can anybody tell what is it called, if its a series of image manipulation? Demonstrated here, Video
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2answers
31 views

Trying to translate formula for blending mode

I am using OpenCV C++ for making the blending mode like in photoshop, I want to make overlay mode in it. I search its alternate in OpenCV in which I found this ...
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1answer
18 views

How to read an image in Scilab

In Matlab we use below function to read an image : var = imread('IMAGE‌‌ ‌PATH'); But, how to do same thing in Scilab ?
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18 views

How vibrance method of photoshop work in opencv

Can somebody please explain how Photoshop vibrance function can use in opencv c++ ? so that I may reproduce the same effects in my application. Here is the vibrance ...
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0answers
21 views

How to understand energy function in thin plate splines?

guys! I have carried out some experiments using matlab warp tools from here. But the results are not good, so I decide to read its original paper Principal Warps: Thin-Plate Splines and the ...
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0answers
14 views

Image to Binary stream for OFDM with qpsk/qam modulation matlab

Im looking to covert a .png or .jpeg image into bitstream so that I can further use it as input bit stream for OFDM with QPSK/QAM modulation in Matlab. I would really appreciate the help on that. ...
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0answers
7 views

Counting human movement of exercise using ROI or pre-set passing line with OpenCV

Hi all I'm new to this page hope you all can guide me. I'm currently doing my final year Degree in computing studies. The project I'm working on is a video of a webcam or computer webcam to have 2 ...
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0answers
27 views

Classifying images with standing\sitting people

I have images that contain two people. They can be divided into the next categories: Both people are standing. One person is standing, and one is sitting. Both are sitting. I want to classify each ...
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2answers
64 views

How to calculate the local gradient of an image in MATLAB

I know that the gradient function is supported by matlab, but the local gradient is not, so how do you calculate it?
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0answers
18 views

Is opencv work fast with android like in desktop?

I am working on android applications and I am now using openCv for it , but when I apply the build in filter algorithms for my app it works slow and show result ...
0
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1answer
9 views

Otsu Thresholding : Why 'minimum within class variance' gives the optimum threshold?

I was trying to understand the Otsu thresholding algorithm in image processing. For that purpose I found a useful link. I got the algorithm flow, but a fundamental doubt arises. Why 'minimum within ...
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26 views

Which method overcome false edge problem [on hold]

I have one problem that is false edge problem. Given a image with real edge and false edge. How to detect where is real edge? Which method?
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0answers
11 views

How can I calculate the Gaussian range and space parameters in a bilateral filter?

Let's suppose I have the following [4x10] image: 1 3 4 5 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 5 3 5 6 8 9 0 0 2 3 4 6 7 8 9 0 8 9 How can I calculate its space ...
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2answers
58 views

Eigen value and Eigen Vectors in Image Processing

I have been reading about eigen values and eigen vectors but i haven't be able to find any decent explanation relating their application in image processing/computer Vision for example say face ...
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3answers
75 views

What is the maximum dynamic range of an N bit signal?

In this presentation on slide 15 there is a corollary: Rule of thumb: the dark noise must be larger than 0.5 Corollary: With a N bit digital signal you can deliver no more*) than N+1 bit ...
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0answers
17 views

How to calculate the freedom of projection matrix?

I learned projection matrix from textbook. It says that the 9th is redundant, so it has 8 freedom. But I can not know the reason clearly. Following the equations. I can not understand why i does ...
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0answers
28 views

Optimal way for curve detection

I am totally new to image recognition and image analysis and have a project concerning detecting a smooth curve on a uniform background (white/black/any color) and then be able to follow this curve ...
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0answers
11 views

Where can I find annotated databases of faces with profile views?

I'm working on a project that uses AAMs (Active Appearance Models). I'd like to have an AAM with profile view. Is is possible to get free annotated images of faces in a profile view?
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14 views

linear contrast stretching based on minimum and maximum calculation from image histogram

I'm studying Gonzalez image processing book and under the topic linear contrast stretching based on minimum and maximum calculation from image histogram has been ...
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0answers
10 views

base curve detection and skew estimation in Binary Document analysis

In document image analysis i came across two differnet sets of literatures. One is skew estimation of text lines and other is base curve detection of text lines. My questions are:- How the two ...
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0answers
23 views

Animal Detection and Recognition

I am working on a project deer detection and recognition. How i will proceed through this project using neural networks in java/.Net using Encog. My task is to detect a deer and it's antler, if it ...
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0answers
22 views

What does normalizing gradient means?

Since my algorithm needs to detect long, coherent edges, the estimated local magnitude P for each pixel is normalized with respect to the magnitudes in it’s local neighborhood W (i.e., a 5x5 window). ...
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0answers
24 views

Intelligent feature vector for an image classification problem

I am a person who loves to learn machine learning from an application point of view. My Objective : To learn machine learning by doing examples in MATLAB or Python like environments. The priority ...
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1answer
46 views

Histogram and binary image in opencv? [closed]

I would like to compute how many zeros and ones (e.i. 255) in a binary image. The following code to generate a binary image by using Matlab. ...
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0answers
17 views

Multi Scale Gradient Structure Tensor

I have implemented the Gradient Structure Tensor for Coherence computation. But the issues of Scale-Space are not giving optimal results. Is there any technique targeted for Multi-Scale GST, so that ...
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35 views

Spectral entropy

I have two signals taken from accelerometers different sides of the body. I want to perform a calculation for spectral entropy as a means for comparing the two signals . I have done my calculations in ...
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0answers
34 views

Realtime image-stitching using a CMOS camera array

I am very new to DSP so please excuse any brevity... I have to design a 4x4 CMOS camera array and stitch the images together for further processing... I have tried doing that with opencv but the ...
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2answers
22 views

Need samples of big endian encoded tifs [closed]

Folks I've written a small utility that extracts some (and only some) header information from Tifs. To test it fully I need some Big Endian Tifs, but I cant find any, and I can't find anything to ...
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0answers
27 views

using frequency of image to update it

I am using c# in a desktop application. If the image - which comes from an ip camera changes from the previous frame then I upload the image in bytes to my web server. I have found some images are ...
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2answers
74 views

Otsu's method problem?

I have a problem with Otsu's method. I would like to implement histogram to compute how many ones' and zeros'. For Otsu's method, I have a code from a book and it is running without problem. This is ...
0
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1answer
49 views

Best method to segment a given image

I have one image. I want to segment it by simple approach. Could you suggest to me the best method to segment it? I think one of them is gradient or FCM. But I am not sure. Please see my given image ...
0
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2answers
22 views

Tracking using color

I am working on tracking an object in a video by using its color. what i did is that i have converted the color of a selected object into LAB color space since it is a uniform color space. and then in ...
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0answers
26 views

how to calculate feature points in SIFT?

i wanna know how to calculate key points? im doing it in matlab. when i select 3 DOG(differnce of gaussian) blured image and compared each pixels in the middle image with 26 neighbourhood(including 9 ...
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0answers
14 views

Triangular Kernel Estimator vs other kernels

For image processing are often used different Kernels for the extraction of keypoint descriptors, is not clear for me how triangle-shaped responses are more relevant than a gaussian response, is this ...
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2answers
57 views

2D Deconvolution in matlab

I am trying to solve the following equation for h (an [MxM matrix]): $$ k[\tau_1,\tau_2]=\sum_{i_1=0}^M \sum_{i_2=0}^M h[i_1,i_2]x[\tau_1-i_1]x[\tau_2-i_2] $$ I have k, which is a 2D [MxM] symmetric ...
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2answers
94 views

Options to enhance a poor image

I have a C# desktop application. I am using EMGU as a wrapper for OpenCV. I am receiving images in JPEG format that were originally taken by an analogue camera. The quality of the image is poor ...
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1answer
34 views

2D version of Shift Theorem

What is the 2D version of Shift Theorem?
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3answers
74 views

What is benefit when convert signed 16 bit to unsigned 8 bit in medical image?

I have an image with its type is 16 bit signed. I see some paper, the author often convert it to unsigned 8 bit. But they did not explain why they do it. Could you explain what is benefit of this ...
1
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1answer
56 views

Entropy/frequency of a natural image

I have a C# desktop application. I am using a wrapper to OpenCV which is EMGU. I am just performing a basic motion detection operation. I am using component labelling and 2 frames differencing to ...
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3answers
70 views

Best way to remove unwanted region from image

I am finding the techniques to remove unwanted regions (small dots) from image. I have an image that includes object and some unwanted region (small dots- see first image). I want to remove it. Hence, ...
0
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1answer
66 views

Image Noise Detection Using MATLAB

I want to implement the following algorithm. Let I denote noisy image and for each pixel of I is represented by I(x,y). A Sliding window of size 3X3 centered at I(x, y) is defined. At first ...
3
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0answers
33 views

Interpolating on the borders of differently-resolved images

I'm creating a three-dimensional model of the earth based on SRTM height data. The data set is pretty huge, so only a small fraction of the data is available at any given time. The height data is ...
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0answers
27 views

reducing chroma of image on client and reconstructing on server

I have a C# desktop application. I am using Emgu wrapper to openCV. My objective is to upload images in the most efficient way I can. I have hit upon the idea of loading an image (jpeg) into memory ...
0
votes
1answer
82 views

Entropy of an image

If I want to measure entropy of an image how should I do it? My aim is to ignore things like tree leaves moving in the wind with my C# desktop application. I know matlab has this functionality but I ...
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0answers
51 views

Sharpening an image using emgu

I have c# desktop application and I am using emgu framework as a wrapper for OpenCV. I am trying to sharpen an image because the input images are not great. I tired a technique I found via searches ...
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0answers
14 views

question about the frequency of Gabor filters

The Fourier transform of 2D Gabor filters is shown below: F is the radial frequency of the Gabor functions. Another parameter Fm is denoted as highest central frequency. Fr is the constant ...
0
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1answer
72 views

How to make filters?

I am trying to make filters like sepia filter in my app like other photo editing applications , till now I don't have any idea about it , Can any one help me out ...
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0answers
98 views

Malaysia Flight 370 Image Processing

I wish that all those people on that flight were with us, and maybe they still are, as I like to think they are on an island somewhere waiting to us to find them ... however, it does not look good... ...