Topological features detection and automatic segmentation of the point clouds from human body surface in standard standing measuring posture are studied,and a new method based on panoramic range image is proposed which is used for topological features detection and automatic segmentation of the point clouds from human body surface.

Combining the characteristics of panoramic range image and VRML together, completes the reconstruction of three-dimensional model from range image and the description of LOD for car s shape?Based on equable mesh refinement and image processing techniques,the method can effectively handle the holes of a car s shape and the car s shape can be exactly reflected.

Relation of depth of field between numeral camera and traditional camera;

ome aspects in the adjustment of the depth of field;

There is very shallow depth-of-field in current iris recognition systems.

On the base of line element hologram, the recording and observing conditions of rainbow hologram of large scene depth without slit are discussed, and some rainbow holograms of large scene depth were recorded in our experiments.

The article analyses the line-element hologram width of zero-path-differencerainbow holography and suggests a way to make large scene depth rainbow hologram using zero path-difference rainbow holography.

Experimental results indicate that the field depth of the wavefront coding system based on a single lens can be extended to 15 mm when the resolving power is 50 μm and the F number is 6, which is 4.

The fundamental optics of the formation of a photographic image and the factors influencing the picture clear ranges and field depth are explained, a detailed procedure is outlined and a series of practical directions are emphasized.

The field depth is an important criterion for making the judgement of photograph quality.