Can you name a feature descriptor which is scale rotation and illumination invariant?
The SIFT features are local and based on the appearance of the object at particular interest points, and are invariant to image scale and rotation. They are also robust to changes in illumination, noise, and minor changes in viewpoint.
Are Hog features scale invariant?
First, HOG is not scale invariant. Getting the same length feature vector for each image does not guarantee the scale invariance. If you want scale invariant HOG I recommend you to read the following paper.
Can You List some scale and rotational invariant feature descriptors?
Can you list some scale and rotational invariant feature descriptors for use in feature detection. The application is for the detection of cars and humans in video captured by a UAV, using a multi-class classifier. So far I have been looking at SIFT and MSER (which is affine invariant).
How to determine the dominant gradient in Photoshop?
You can determine the dominant gradient, or orientation at an image patch (your feature area). Then, rotate the image patch so that the gradient is always looking in the same direction, e.g 0 (upwards).
Which is an angle invariant descriptor of a radial profile?
Thus, a radial profile (sum of pixel value in polar coordinates) is an angle invariant descriptor. By the way, that is one of the reasons that fiducials are manufactured as circles on electric circuit boards: I would rather look into KAZE / AKAZE, which perform equally good with significant speed-up. The deformation cases are also tolerated.
Is the sum of polar coordinates an angle invariant descriptor?
All angles are equal. Thus, a radial profile (sum of pixel value in polar coordinates) is an angle invariant descriptor. By the way, that is one of the reasons that fiducials are manufactured as circles on electric circuit boards: I would rather look into KAZE / AKAZE, which perform equally good with significant speed-up.