Passive three-dimensional (3D) image sensing techniques for chroma difference-based object verification are described. For example, a plurality of sub-images correspond to a 3D feature region of an object. The sub-images may be analyzed, and based on a plurality of differentiated chroma components of raw image sensor data captured from the object, a corresponding set of feature depth measurements (e.g., depth, textural feature, etc.) is obtained. A verification signal may be output as a function of comparing a respective set of feature depth measurements from the plurality of feature sub-images to previously stored feature depth desired values, such that the verification signal indicates whether the identity of the object is verified and/or whether the object is spoofing.
Passive image depth sensing for chroma difference-based object verification