Unanswered Questions
14
votes
0answers
198 views
Are there any analytic approaches to the design of quadratic polynomial filters?
The following paper describes an application of the Teager-Kaiser energy operator to x-ray image enhancement:
Reinhard Bernstein, Michael S. Moore and Sanjit K. Mitra, "Adjustable
Quadratic ...
10
votes
0answers
70 views
Reconstructing Tree Limbs that are Occluded by Leaves
How would would one approximately reconstruct the branches in a photo of a tree, where portions of the branches are covered by leaves?
I can extract the visible portions of the branches by ...
10
votes
0answers
190 views
Recover curves from noisy collection of points
Background: I'm trying to make a system that tracks a number of bubbles in a video
I'm implementing the bubble detection in the single image case using the Circular Hough Transform. Due to occlusion, ...
8
votes
1answer
207 views
ADC performance simluation: How to calculate SINAD from FFT?
While working on this problem, I started to have doubts that my initial definition of
$$SINAD = 10 \log_{10} \left( \frac{p_f} {\sum_i{(p_i)} - p_0 - p_f} \right)dB$$
is correct. In this equation, ...
8
votes
0answers
126 views
Real-valued ringing when zero-padding odd-length FFT
So I'm trying to write a frequency-domain interpolator that zero-pads the frequency response of a signal and inverse transforms. There's two cases I have to deal with:
Even-length response - have ...
8
votes
0answers
206 views
Accurately measuring relative distance between a set of fiducials (Augmented reality application)
Let's say I have a set of 5 markers. I am trying to find the relative distances between each marker using an augmented reality framework such as ARToolkit. In my camera feed thee first 20 frames show ...
7
votes
0answers
191 views
How to deduce a linear system's impulse response from a set of input/output signals?
I want to know how to solve those types of problems.. is it by inspection ?
Consider the linear system below. When the inputs to the system $x_1[n]$, $x_2[n]$ and $x_3[n]$, the responses of the ...
7
votes
0answers
150 views
Wang Transformation
I'm essentially a math student working on algorithms for a chemistry problem involving rotational spectra, and I keep coming across references to Wang transformations but have been unable to track ...
7
votes
0answers
63 views
Using an error prediction filter for filtering a semi-known signal
I'm trying to wrap my head around the proper use of a Wiener or error-prediction filter for filtering data. It seems to me that it is only a whitening filter, so how is it used when the data you want ...
7
votes
1answer
489 views
Frequency Modulation Synthesis Algorithm
Based on what I read, I've made an algorithm for FM sound synthesis. I'm not sure if I did it right. When creating a software synth instrument a function is used to generate an oscillator and a ...
7
votes
0answers
219 views
How do I implement an adpative thresholding algorithm for underwater sonar
I want to implement an adaptive thresholding algorithm in MATLAB for filtering data received by an underwater sonar receiver. The data received has an interactive noise component resulting from ...
6
votes
1answer
85 views
+50
'Best fit' motion curve for an unachievable profile
I have a discrete function that represents a 1d position in space over time. I have a motion system that would like to achieve this curve, but, due to constraints on jerk (3rd derivative) and ...
6
votes
0answers
155 views
Deblurring algorithm to precede thresholding - speed over accuracy
I'm writing an app that recognizes Sudoku puzzles from a camera input. I'd like to remove camera blur from the images to improve recognition. Here is an example image:
Since I'm processing a ...
6
votes
0answers
103 views
Counting vechicles in an image
I have been trying to implement an algorithm for successfully counting cars in an image. I have tried implementing A Method for Vehicle Count in the Presence of
Multiple-Vehicle Occlusions in Traffic ...
6
votes
0answers
407 views
Calculating a homography based on detected lines
I know you can calculate homographies from image to camera plane using correspondence points between a "perfect model" and the image points.
I'm doing it for a football pitch/field, and have used ...
