The angle between the lines of sight of two eyes with each object known as parallactic angle helps our brain in determining the relative distances between objects. In stereoscopic vision, objects are viewed with both eyes a little distant from each other (approximately 65 mm) helps in viewing objects from two different positions and angles, thus a stereoscopic vision is obtained. Depth is perceived primarily based on the relative sizes of objects, shadow distant objects appear smaller and behind closer objects. Monoscopic or monocular vision refers to viewing surrounding objects with only one eye. The perception of depth through binocular vision is referred to as stereoscopic viewing, which means viewing an object from two different locations. This stereo effect is possible because we have two eyes or binocular vision. On our daily life we unconsciously perceive and measure depth using our eyes. 3D representation of the earth’s surface resulting in the collection of the geographic information with a greater accuracy compared to the monoscopic techniques. Stereo viewing allows the human brain to judge and perceive in depth and volume. Stereoscopic vision is constructed with a stereopair images using the relative orientation or tilt at the time of photography. It is based on Porro-Koppe’s Principle that the same light path can be generated in an optical system if a light source is projected onto the image taken by an optical system. A stereoscope facilitates the stereoviewing process by looking at the left image with the left eye and the right image with the right eye. Thus obtained a pair of stereoscopic photographs or images can be viewed stereoscopically. In aerial photography, when two photographs overlap or the same ground area is photographed from two separate position forms a stereo-pair, used for three dimension viewing. Stereoscopy, sometimes called stereoscopic imaging, is a technique used to enable a three dimensional effect, adding an illusion of depth to a flat image.
0 kommentar(er)
