33 research outputs found
Qualidade de laranjas 'Valência' produzidas sob sistemas de cultivo orgânico e convencional
Enhanced shape-from-shading for object recognition
SIGLEAvailable from British Library Document Supply Centre-DSC:DXN037057 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Example-Based Face Shape Recovery Using the Zenith Angle of the Surface Normal
We present a method for recovering facial shape using an image of a face and a reference model. The zenith angle of the surface normal is recovered directly from the intensities of the image. The azimuth angle of the reference model is then combined with the calculated zenith angle in order to get a new field of surface normals. After integration of the needle map, the recovered surface has the effect of mapped facial features over the reference model. Experiments demonstrate that for the lambertian case, surface recovery is achieved with high accuracy. For non-Lambertian cases, experiments suggest potential for face recognition applications