Questions tagged [computer-vision]
Questions about algorithms for processing and analyzing images and videos.
268
questions
5
votes
1answer
5k views
Does there exist a data compression algorithm that uses a large dataset distributed with the encoder/decoder?
If my goal were to compress say 10,000 images and I could include a dictionary or some sort of common database that the compressed data for each image would reference, could I use a large dictionary ...
1
vote
1answer
381 views
How to compute Gabor feature vector?
I'm working on semi automatic texture segmentation using level set and gabor feature vector described by Manjunath und Ma [1]. I consider their feature representation is better than others since I can ...
2
votes
4answers
715 views
Environment detection - How to detect "city" versus "landscape" background environment in computer vision?
I'm searching for computer vision or machine learning algorithms/methods that are used to classify or differentiate two outdoor environments. Given an image with vehicles, I need to be able to detect ...
3
votes
1answer
131 views
Environment requirement in training image dataset for classifier
I have a question about preparing the dataset of positive samples for a cascaded classifier that will be used for object detection.
As positive samples, I have been given 3 sets of images:
a set of ...
1
vote
1answer
95 views
Job sites for applied/interdisciplinary mathematics related to computer science? [closed]
I'm looking for job sites in applied/interdisciplinary mathematics, more specially, say postdocs or higher positions in mathematics and medical imaging, mathematics and computer vision. I'm aware of ...
4
votes
2answers
2k views
Object recognition - given an image, does it contain a particular 3D object of interest?
I have in mind a particular 3D object. Given an image taken by a camera, I want to check whether that image contains an instance of my object.
For instance, let's say that the object is a bathroom ...
11
votes
1answer
3k views
Deriving the Sobel equations from derivatives
Many sites give the Sobel operators as the convolution mask for smoothing an image. However, I haven't found a single site that describes how you can derive the operators from partial first ...
7
votes
2answers
318 views
Automated lip-reading: inferring what someone is saying, based upon video of them speaking
Some humans can lip-read fairly well: by watching someone who is speaking, they can tell what the speaker is saying (even without hearing the speech).
Has there been any work on building computer ...
3
votes
1answer
205 views
How does facial recognition work?
I'm interested in learning about how facial recognition works. I'm especially interested in the algorithms or approach that is used. What are the leading methods for facial recognition? Is there a ...
0
votes
1answer
269 views
Is developing an OCR considered a research project? [closed]
Is developing an optical character recognition system for an alphabet which has no previous ocr considered a reputable conference or journal worthy research project, given the fact that there are so ...
2
votes
1answer
612 views
Contrast Enhancement For An Image Using A Gaussian Function
I am working on a program that involves detecting faces in photos, i am reading a paper that someone has wrote and they said that they had more success detecting faces once he they applied some ...
2
votes
2answers
242 views
Computer Vision - Algorithm for reconstructing tilted image
Recently I've seen this very good apps
https://play.google.com/store/apps/details?id=com.kingjim.shotnote&hl=en
https://itunes.apple.com/JP/app/id411332997?mt=8
this apps reconstruct the image ...
3
votes
3answers
190 views
How center the eyes of human face at specific pixels?
I am facing a problem with processing some frontal facial images.
I need to adjust the centers of the eyes (irises) to be at certain specific pixels in the image. In other words, i need to transform ...
3
votes
3answers
326 views
Handwritten character recognition as characters are being traced
I'm looking for an OCR technique (PCA or SVM or anything else) in a peculiar setting. I want to detect the motion of the finger so that if someone writes something in front of the camera in the air, I ...
22
votes
3answers
48k views
What are the differences between computer vision and image processing?
What are the differences between computer vision and image processing? For example, in object recognition, what are the roles of computer vision and image processing?
7
votes
3answers
10k views
Shannon's entropy for an image
Shannon's entropy [plog(1/p)] for an image is a probabilistic method for comparing two pixels or a group of pixels.Suppose an image with a matrix of 3x3 has pixel intensity values
...
3
votes
1answer
152 views
Which Is a Better Way of Obtaining Scales, Gaussian Blur or Down Sampling?
In computer vision, scales are important when we carry out a scene analysis. Choosing different scales affect the result of the analysis. For example, if a face is relatively small in the scene, then ...
9
votes
3answers
2k views
Intuition for convolution in image processing
I have read many documents about convolution in image processing, and most of them say about its formula, some additional parameters. No one explains the intuition and real meaning behind doing ...
