Image Formation. Projection Geometry Radiometry (Image Brightness) - to be discussed later in SFS. Image Formation 1
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1 Image Formation Projection Geometry Radiometry (Image Brightness) - to be discussed later in SFS. Image Formation 1
2 Pinhole Camera (source: A Guided tour of computer vision/vic Nalwa) Image Formation 2
3 Perspective Projection (source: A Guided tour of computer vision/vic Nalwa) Image Formation 3
4 Perspective Projection Image Formation 4
5 Some Observations/questions Note that under perspective projection, straightlines in 3-D project as straight lines in the 2-D image plane. Can you prove this analytically? What is the shape of the image of a sphere? What is the shape of the image of a circular disk? Assume that the disk lies in a plane that is tilted with respect to the image plane. What would be the image of a set of parallel lines Do they remain parallel in the image plane? Image Formation 5
6 Note: Equation for a line in 3-D (and in 2-D) Line in 3-D: Line in 2-D By using the projective geometry equations, it is easy to show that a line in 3-D projects as a line in 2-D. Image Formation 6
7 Vanishing Point Vanishing point of a straight line under perspective projection is that point in the image beyond which the projection of the straight line can not extend. I.e., if the straight line were infinitely long in space, the line would appear to vanish at its vanishing point in the image. The vanishing point of a line depends ONLY on its orientation is space, and not on its position. Thus, parallel lines in space appear to meet at their vanishing point in image. Image Formation 7
8 (source: A Guided tour of computer vision/vic Nalwa) Vanishing Point Image Formation 8
9 The Vanishing Point (source: A Guided tour of computer vision/vic Nalwa) Image Formation 9
10 Vanishing point (last slide!) For any given spatial orientation, the vanishing point is located at that point on the projection surface where a straight line passing through the center of projection with the given orientation would intersect the projection surface. Image Formation 10
11 Planar vs Spherical Perspective Projection (source: A Guided tour of computer vision/vic Nalwa) Image Formation 11
12 Spherical Perspective Projection Under parallel perspective projection, straight line map onto straight line. Question: What do straight lines map onto under spherical perspective projection? Image Formation 12
13 Orthographic Projection Projection onto a plane by a set of parallel rays orthogonal to this plane. X i = x 0 Y i = y 0 (source: A Guided tour of computer vision/vic Nalwa) Image Formation 13
14 Approximation of Perspective Projection A. object dimensions are small compared to the distance of the object from the center of projection. B. Compared to this distance, the object is close to the straight line that passes through COP and is orthogonal to the IP. Image Formation 14
15 Approximation by Parallel Projection (source: A Guided tour of computer vision/vic Nalwa) Image Formation 15
16 Parallel Projection Parallel Projection is a generalization of orthographic projection in which the object is projected onto the image plane by a set of parallel rays that are not necessarily orthogonal to this plane. Perspective projection can be approximated by parallel projection up to a uniform scale factor whenever the object s dimensions are small compared to the average distance of the object from the center of projection. Image Formation 16
17 Note: Imaging with a lens Image Formation 17
18 Misfocus Blur Image Formation 18
19 Brightness Irradiance, as a measure of image brightness Irradiance is the power per unit area (Watts per square meter) of radiant energy falling on a surface. E P = d da Irradiance Image Formation 19
20 Brightness Scene Brightness -- Radiance Radiance is the power emitted per unit area into a cone of directions having unit solid angle (Watts per square meter per steridian.) L P = d 2 dadw Image Formation 20
21 Image Formation: Summary Projection Geometry What determines the position of a 3D point in the image? Image Brightness What determines the brightness of the image of some surface? This we will discuss later when we talk about shape from shading. Image Formation 21
22 Summary Projection Geometry - determines the position of a 3D point in the image. Perspective projection approximations using orthographic projection parallel projection terminology center of projection vanishing point optic axis focal point, focal length Image Formation 22
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