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Questions tagged [enhancement]

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Contrast enhancing very faint extended blobs in an image

I have a series of images of the night sky and I'm looking for methods to enhance very faint structures that are barely visible. The movement of those structures is visible when you click through ...
requiemman's user avatar
1 vote
0 answers
49 views

No prior research? What am I not understanding? Using deep learning to enhance videos by predicting the best filters or histogram transforms to apply

I would like to make a large set of videos more visually pleasing by adjusting colors, saturation, contrast, etc. However, the techniques that I can find online roughly fall into these two categories: ...
elgehelge's user avatar
  • 111
1 vote
1 answer
46 views

systematic approach to enhance brightness and contrast of a panchromatic image

I have panchromatic images taken from a remote senescing device, and it is downloaded as a raw which is dark/ underexposed (as 1st pic), hence it needs enhancement in brightness and contrast to be ...
gin's user avatar
  • 123
1 vote
1 answer
101 views

Using an experimental PSF to perform a deconvolution

I have an experimental PSF (point spread function) of an optical system for remote sensing images. However, it is asymmetrical and has some sidelobes as below. And I want to perform deconvolution to ...
gin's user avatar
  • 123
0 votes
1 answer
66 views

An image brightness improvement scheme based on the Fechner principle

Currently I am reading Principal Component Analysis-Based Low-Light Image Enhancement Using Reflection Model. That article proposes a way for obtaining the ...
hasanghaforian's user avatar
1 vote
1 answer
140 views

main idea of Adaptive histogram equalization (AHE)

I want to understand the main idea behind AHE and the way for applying it manually with my hands. Wikipedia says: In its simplest form, each pixel is transformed based on the histogram of a square ...
hasanghaforian's user avatar
3 votes
1 answer
221 views

Mathematically show the problem of Histogram Equalization

Wikipedia - Adaptive Histogram Equalization says about classic Histogram Equalization: This works well when the distribution of pixel values is similar throughout the image. However, when the image ...
hasanghaforian's user avatar
0 votes
2 answers
226 views

purpose of histogram equalization

What is the main purpose of histogram equalization on image? Is it used to enhance contrast of image or is its goal finding a transformation which gets a more uniformly histogram? Although Wikipedia ...
hasanghaforian's user avatar
1 vote
0 answers
99 views

Audio smooth / enhance algorithm, software

Years ago I was working with a sound editor program called Sony Sound Forge. It had this filter of smooth/enhance which I liked and used a lot, but now I can't find such filter in Adobe Audition or ...
user174174's user avatar
1 vote
2 answers
139 views

Comparing a clean, noisy and enhanced signal

I was doing some experiments on analyzing few audio samples and I'm stuck with this. Suppose we have a clean audio signal ($y_{clean}$), a noisy version of it ($y_{noisy}$) and an enhanced version ($...
Debasish Das's user avatar
3 votes
1 answer
469 views

1st and 2nd Gaussian derivatives for edge detection

I have a project about edge detection, I made research on internet about filters and read many articles but there is an article talked about using Sobel and Gaussian derivatives then it mentioned &...
Fahd Jerbi's user avatar
4 votes
1 answer
389 views

Tile Laplacian Filter in MATLAB

I want to compute the output image by first dividing the image into 8*8 blocks and applying laplace filter separately and combine them but I am not getting the correct output Here is the code: ...
YASHWANTH M's user avatar
1 vote
1 answer
246 views

The Math of Histogram Matching

Please help solve the problem in the picture. I am confused due to the piecewise nature of the density functions. If it was a simple curved PDF, I would simply integrate over full range and use the ...
fac120's user avatar
  • 11
2 votes
1 answer
59 views

Enhancement by adaptive wavelet shrinkage denoising

I was wondering does anyone know any programming library or a way that can help me implement this algorithm.
Stefan Radonjic's user avatar
0 votes
0 answers
43 views

How to Enhance the height difference of the experimental signal data?

I'm very new to signal processing. Is there any kind of method to enhance the signal of experimental data that I get from the experiment? Especially on the difference of y-axis. Thank you This signal ...
NexusRay's user avatar
2 votes
1 answer
290 views

Licence plate enhancement

Is it possible to enhance the image below and make it more readable? I have tried apply binarization but there is some kind of shadow. So I have tried to convert image to gray scale and then ...
Krivers's user avatar
  • 131
4 votes
1 answer
839 views

Sharpening Using Laplacian Kernel - How to Handle the Output (Specifically Negative Values)?

In order to sharpen an image using Laplacian kernel, it should be convolved with the original image. It is evident that the result might have negative values. I am not sure what to do with these ...
SOFUser's user avatar
  • 43
0 votes
1 answer
364 views

What is meant by 'combine the luminance and chrominance '

I am new with image processing. I'm trying to implement a research paper in MATLAB. I didn't understand a sentence. Here it is: The luminance is enhanced by applying the proposed algorithm and it ...
Hernan Crespo's user avatar
0 votes
0 answers
171 views

How enhance amplitude of audio signal without distortion?

After FFT I've set to zero some frequencies and I'd like to enhance the amplitude in order to recover the leak. I'd like to do a normalization in order to avoid distortion. I've done in this way but ...
Ausilia's user avatar
4 votes
1 answer
785 views

Automatic Image Enhancement of Images of Scanned Documents (Auto Whitening)

Dropbox have make a blog post about there automatic enhancement method for scanned document image - Fast Document Rectification and Enhancement. I followed the post and they mention a formula to make ...
lafi raed's user avatar
0 votes
0 answers
181 views

Improving credit card like image scan for OCR

OCR works best for black on white or binary images, where letters have sharp contours, no noise, and solid filling, i.e. they are nothing like this: For the curious it's a part of a document number ...
Rajish's user avatar
  • 101
0 votes
0 answers
116 views

Enhancing very thin lines in images

I want to detect filopodia (red arrow indicates filopodia in a vessel image). My strategy is that if $I$ is the original and $J$ is the another image after opening operation. Then, $I-J$ is the ...
jakeoung's user avatar
  • 457
1 vote
1 answer
225 views

Enhance image in matlab - exp operation - imageJ software-LPR

I use imageJ software, imageJ has a EXP command (process >math >exp ). original image: output image processed by EXP command in imageJ software: in this link explain how do that ImageJ: http://...
Karo Amini's user avatar
2 votes
1 answer
1k views

Image enhancement algorithms for adjusting shadow, exposure, contrast etc

For those who have either used Picasa/Photoshop, they would see different image enhancement options such as: Change exposure Change shadow Change highlights Change vibrance I have searched online a ...
Autonomous's user avatar
1 vote
2 answers
484 views

Speech Enhancement Libraries

Is there any speech enhancement algorithm library? I need to process a sound to voice recognition, and I want to remove noise from audio source.
Victor's user avatar
  • 111
0 votes
1 answer
549 views

Remove spurious peaks of Hilbert transform

I want to eliminate spurious peaks of Hilbert transform for finding glottal closure in the linear prediction (LP) residual. I have the following 4 steps: Down-sample. Hilbert Transform. Identify ...
Ali Bodaghi's user avatar
3 votes
4 answers
7k views

How to Generate False Color Palette

How to convert grayscale intensity input to something like the following image? It seems that no response (0, black) is converted to dark blue, then it goes through other colors to red. How are ...
Libor's user avatar
  • 4,255