An improved NGLDM is presented for an image.
Defined a new texture feature of image namely composite texture.
Combined with the ore grade, the numerical intervals representing the extracted composite textures are adopted for off-line classification and on-line recognition by a support vector machine (SVM) classifier for froth images.
The improved NGLDM could reflect the texture of froth surface more completely.
The composite texture has better accuracy in classification than traditional one.