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Questions tagged [image-enhancement]

71 questions
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5 answers

White balance algorithm

I'm doing some image processing and I need an automatic white balancing algorithm that's not too intensive in terms of CPU computation time. Any recommendations? EDIT: and if it's relevant to efficiency, I'll be implementing it in Java with color…
Charles Ma
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averaging mask and laplacian mask in image processing

in a given application I apply an averaging mask to input images to reduce noise, and then a Laplacian mask to enhance small details. Anyone knows if I Would get the same results if I reverse the order of these operations in Matlab?
Glove
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contrast enhancement of an image using neighbourhoood

Hi I want to enhance the contrast of an image using the neighbourhood pixel values. Let the image be considered as u0. Then I want to enhance the image by using the formula Here, M1 is the minima and M2 is the maxima of u0 among the neighbourhood…
roni
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What is the representation of RGB image?

I have started studying image processing and I am stuck here, please help me. A gray scale image is represented by M by N matrix where the value of each element of the matrix is [0,255] which represents intensity. example: row 1 : 2,120 row…
Anil
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Measure distance between images

Regarding my question about Gaussian noise reduction, I would like to know of a simple method to quantify the success of a noise reduction filter. I've attempted a few methods of noise reduction and I want some method to determine which one works…
shwartz
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How to work with Bitmap(Effects) in Android?

I want to add some effects to images in Android. I am importing the library file in Aviary. I am just a fresher to Android Development. Can anybody be kind enough to provide with a small example on how to use the methods from the library file ?…
San
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The Concept of Homomorphic Filtering

I am trying to understand the concept of homomorphic filtering, I have read several online pages about this topic such as http://en.wikipedia.org/wiki/Homomorphic_filtering However, I noticed a scarce online resources that discuss this topic.…
Traveling Salesman
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What software would you recommend for image enhancement prior to OCR (Optical Character Recognition)?

We are currently researching ways of enhancing image quality prior to submission to OCR. The OCR engine we are currently utilizing is the Scansoft API from Nuance (v15). We were researching the Lead Tools but have since decided to look elsewhere. …
Tim
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How to Compare the quality of two images?

I have applied Two different Image Enhancement Algorithm on a particular Image and got two resultant image , Now i want to compare the quality of those two image in order to find the effectiveness of those two Algorithms and find the more…
Deepak kumar Jha
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remove stripes / vertical streaks in remote sensing images

I have a remote sensing photo that has bright non continuous vertical streaks or stripes as in the pic below, my question is there a way to remove them using python and opencv or any other ip library? ,
gin
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What can I do to enhance my image quality?

I have a 3-phase image in which I have segmented using automated thresholding (multithresh) and ‘imquantize’ functions. I do have lots of holes in the image without any filtering operation. However, these holes are reduced when I use a median filter…
User2201
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Obtaining orientation map of fingerprint image using OpenCV

I'm trying to implement the method of improving fingerprint images by Anil Jain. As a starter, I encountered some difficulties while extracting the orientation image, and am strictly following those steps described in Section 2.4 of that paper. So,…
E_learner
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Underwater image enhancement using opencv c++

I am trying to enhance an underwater video image using opencv. The object detection is taking place in the HSV color space. Prior to that, I have been trying to figure out the technique to eliminate the color distortion from the water. One technique…
user2869622
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palm veins enhancement with OpenCV

I'm trying to implement in OpenCV an algorithm to bring out the details of a palm vein pattern. I've based myself on a paper called "A Contactless Biometric System Using Palm Print and Palm Vein Features" that I've found on the Internet. The part…
cid
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Color problem with Log transform to brighten dark area. Why and how to fix?

So I try to enhance this image by applying log transform on it original image The area where there are bright white color turns into color blue on the enhanced image. enhanced image path = '...JPG' image = cv2.imread(path) c = 255 / np.log(1 +…
Cong Luong
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