Détection et extraction des caractéristiques

Create a Content Based Image Retrieval (CBIR) system using a customized bag-of-features workflow.

Use the 2-D normalized cross-correlation for pattern matching and target tracking. The example uses predefined or user specified target and number of similar targets to be tracked. The normalized cross correlation plot shows that when the value exceeds the set threshold, the target is identified.

Detect a particular object in a cluttered scene, given a reference image of the object.

Classify digits using HOG features and a multiclass SVM classifier.

Automatically determine the geometric transformation between a pair of images. When one image is distorted relative to another by rotation and scale, use detectSURFFeatures and estgeotform2d to find the rotation angle and scale factor. You can then transform the distorted image to recover the original image.

Automatically create a panorama using feature based image registration techniques.

Stabilize a video that was captured from a jittery platform. One way to stabilize a video is to track a salient feature in the image and use this as an anchor point to cancel out all perturbations relative to it. This procedure, however, must be bootstrapped with knowledge of where such a salient feature lies in the first video frame. In this example, we explore a method of video stabilization that works without any such a priori knowledge. It instead automatically searches for the "background plane" in a video sequence, and uses the observed distortion to correct for camera motion.

Use morphological operations to count objects in a video stream.

Use a combination of basic morphological operators and blob analysis to extract information from a video stream. In this case, the example counts the number of E. Coli bacteria in each video frame. Note that the cells are of varying brightness, which makes the task of segmentation more challenging.