Method of producing compact descriptors from interest points of digital images, corresponding system, apparatus and computer program product

A device, comprising:

• one or more memories;
• and
• digital image processing circuitry, which, in operation:
• decomposes digital images into blocks;
• computes an energy value for each said block;
• selects blocks based on the computed block energy values and one or more energy thresholds;
• detects interest points in the selected blocks;
• selects key points out of the detected interest points;
• and
• generates compact descriptors of the digital images using the selected key points.

A system, comprising:

• an image capture device, which, in operation, outputs digital images;
• and
• image processing circuitry coupled to the image capture device, and which, in operation:
• decomposes digital images into blocks;
• computes an energy value for each said block;
• selects blocks based on the computed block energy values and one or more energy thresholds;
• detects interest points in the selected blocks;
• selects key points out of the detected interest points;
• and
• generates compact descriptors of the digital images using the selected key points.

A non-transitory computer-readable medium having contents which, when accessed by a digital image processor, configure the digital image processor to perform a method, the method comprising:

• decomposing digital images into blocks;
• computing an energy value for each block;
• selecting blocks based on the computed block energy values and one or more energy thresholds;
• detecting interest points in the selected blocks;
• selecting key points out of the detected interest points;
• and
• generating compact descriptors of the digital images using the selected key points.