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I agree that faces are easy and contains lots of internal features, so that wavelet features can represent the characteristics of the face well. Still, they have pulled the performance of this "easy" problem up to a level that it actually meets the normal people's standards, not to just vision people's who are pretty generous.

Regarding Schneiderman's paper, I like the general attitude of the author. There isn't much mathematically solid foundation or any fancy model from the machine learning community, but the author has a good idea of what is going on in each step and what the advantages and limitations are. He doesn't over-generalize or make overstatement of his methods.

The limitations are, of course, that they are looking at a tiny subwindow each step and doesn't take any global information into account.

A problem with these window-scanning approaches is that the idea of training a separate classifier for each object in the world (and even different classifiers for different poses) just doesn't scale with the large number of objects present in the world.


Surely one does not want 1 million classifiers being independently applied to each window in an image.

This paper presents an object detection framework capable of processing images at real-time speeds while achieving high accuracy. This paper introduces a few novel ideas (integral images) and also brings together many existing concepts (feature selection using AdaBoost and heirarchical classification).

However, I have a few concerns (which might be shared by others too):

0) Given the specific (and rather inflexible) nature of the features, I am wondering if this is indeed an object detection system, or just a frontal-face detection system. Although authors mention in passing towards the end that this can be applied to pedestrian detection, their features seem to be very specific for faces.

1) Another issue is that this method doesn't seem to be invariant to anything: pose or translation, even though authors mention that it can 'absorb' small translations. It seems to work well on frontal-face dataset; for more credibility, they should have provided results on other harder datasets.

2) The training time (order of weeks) seems too long. Although, I have to admit that I am not familiar with the 'par training time' for current systems.

3) Since they are working with small 24x24 patches, and have difference of intensities of image parts as features: I am just curious how well a naive pixel intensity based classifier would work (576 dimensional feature vector). These features will need a lot less time to train on?

Please post your thoughts on Schneiderman & Kanade and Viola & Jones here. Which one do you like better?