O'Reilly logo

OpenCV Essentials by Jesus Salido Tercero, Julio Alberto Patón Incertis, Ismael Serrano Gracia, Gloria Bueno García, Noelia Vállez Enano, Mª del Milagro Fernández Carrobles, Oscar Deniz Suarez

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Cascades are beautiful

Most objects' detection problems, such as face/person detection or lesion detection in medicine, require searching for the object in many image patches. However, examining all image zones and computing the feature set for each zone are time-consuming tasks. Cascade detectors are widely used because of their high efficiency in doing this.

Cascade detectors consist of various boosting stages. The boosting algorithm selects the best feature set to create and combine a number of weak tree classifiers. Thus, boosting is not only a detector but also a feature selection method. Each stage is usually trained to detect nearly 100 percent of objects correctly and discard at least 50 percent of the background images. Therefore, background ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required