VideoCAD

PTZ or Fisheye

Hide Navigation Pane

PTZ or Fisheye

Previous topic Next topic No directory for this topic Expand/collapse all hidden text  

PTZ or Fisheye

Previous topic Next topic Topic directory requires JavaScript JavaScript is required for expanding text JavaScript is required for the print function Mail us feedback on this topic!  

 

Graphics window

Toolbar

PTZ or Fisheye

Click to expand
Click to expand

 

The panel shows the simulation parameters of PTZ cameras and cameras with Fisheye lens.

To make the active camera a PTZ or Fisheye camera, select the corresponding switch.

 

       PTZ camera

 

A PTZ camera consists of a base and a moving part. On the Camera Position panel, the angle of rotation of the base of PTZ camera in horizontal plane is set. The moving part can be controlled like a normal camera.

 

The PTZ Range panel sets the maximum angles of rotation and inclination of the moving part of the PTZ camera.

 

* Range of change of the lens focal length for any cameras is set via the List / Range string in the Sensor and Lens window.

 

Below, schematically the PTZ camera and its view area is displayed in two projections.

 

PTZ camera options apply to all PTZ cameras in the project at once.

 

Full view area - show view areas of PTZ cameras taking into account possible rotation of the cameras. If the checkbox is not marked, view areas of PTZ cameras will look like normal cameras.

 

Add angles of view - expand the view area by halves of horizontal and vertical view angles of the camera with the current focal length. If the checkbox is not marked, view areas of PTZ cameras will be limited exactly by the maximum angles of rotation and tilt.

 

Limit rotation -  limit rotation and tilt of the moving part of PTZ cameras by the specified maximum angles of rotation and inclination. If the checkbox is not marked,  the base of PTZ cameras will be rotated following the moving part.

 

PTZ cameras in the Graphics window and in the 3D World window

 

In the Graphics window, the horizontal projection of the view area is modeled and the pixel density distribution of the PTZ cameras is visualized. The projection is constructed according to the rule Within projection.

 

 

In the 3D World window, the control area of the camera with shadows and the distribution of pixel density are visualized.

 

\

 

 

The distribution of the pixel density of PTZ cameras depends on the current lens focal length.

 

In order for a PTZ camera to be drawn in the Graphics window by a special icon or , you must assign this icon when creating the camera or later in the Camera List window. Selecting an icon works regardless of the state of the Fisheye - PTZ - None switch.

 

Presets of PTZ camera

 

You can create PTZ camera presets using positions. Positions can be displayed simultaneously in the Graphics window and in the 3D World window. In the 3D Video window, you can display images from positions at the same time with dividing the screen.

 

For details, see: Active Camera Positions / Multisensor

 

Models of PTZ cameras

 

To make a camera model a PTZ camera:

 

Assign Yes to the model parameter PTZ camera> PTZ so that the camera is modeled as a PTZ camera.
Fill in the values of the limiting angles of rotation and inclination PTZ camera> Max. angles (degree).
Set the range for changing the lens focal length in the List / Range box.
Choose PTZ or auto-dome icon to the model Icon so that the camera is drawn with the corresponding icon or in the Graphics window.

 

See also: Modelling PTZ camera

 

 

       Fisheye

 

The panel is designed to control simulation of cameras with a view area in the form of a hemisphere (fisheye, 360°/180° cameras).

To enable the simulation of the active camera as a Fisheye camera,  check the Fisheye checkbox.

 

On the Camera Position panel,  in the Hor. angle and Tilt angle combo boxes the angles of rotation of camera main optical axis in horizontal and vertical planes are specified.

 

Thus, if the camera is mounted on a vertical wall, the Tilt angle should be zero, and Hor. angle determines angle of the wall. If the camera is mounted on a ceiling, the Tilt angle must be set to 90 degrees, and the Hor. angle does not matter. If the camera is mounted on the floor, the Tilt angle should be - 90 degrees.

 

Pan, tilt and rotation of the camera around its own axis, made in usual way in Graphics window and Camera geometry box does not affect the position of the Fisheye camera.

 

Below, schematically the Fisheye camera and its view area is displayed in two projections.

 

Pixel density of Fisheye camera

 

Image resolution of a Fisheye camera is determined by the Number of pixels of sensor

Lens focal length and Image size at image processing have no affect on the image resolution of a Fisheye camera.

 

Pattern criterion of pixel density for panoramic cameras must be based on pixel density (Pixel per meter (Pixel per foot), Pixel for object), but not on field of view size. Criterion Field-of-view height, % of Field-of-view for object are not suitable to panoramic cameras, because of panoramic cameras don't have a stable field of view.

The Vert.(Horiz.) number of pixel box displays a virtual number of pixels for correct simulation of the resolution..

 

Fisheye in the Graphics window and 3D World

 

In the Graphics window the horizontal projection of the view area and  the distribution of pixel density are visualized. The projection is constructed in accordance with the Within projection rule.

 

 

In the 3D World the camera coverage area and distribution of pixel density are visualized.

 

\

 

To draw a camera using the special icons or in the Graphics window, you need to choose this icon during new camera creation or later on the Camera list panel. Selecting the icon works regardless of the state of the Fisheye - PTZ - None switch .

 

The lens focal length boxes in the Graphics window and the Camera Geometry box for panoramic cameras are colored by aqua.

In reports and in the exported dxf or dwg files for panoramic cameras instead of the lens focal length value the 'fisheye' word is displayed. .

 

See also: Modeling panoramic cameras (Fisheye, 360°/180°)

 

Fisheye камеры в окне 3D Видео

 

In the 3D Video window, VideoCAD can simulate 2 types of image from Fisheye cameras:

 

Full 360/180 degrees image.

 

Dewarped fragment of the image with real resolution

 

You can switch image type on the Panoramic tab of the Image parameter panel.

 

Full 360/180 degrees image

 

 

It may take some time to generate the full image, please wait.

 

The full fisheye image mode supports PiP mode, motion simulation, animation, lens resolution, and partial sensitivity modeling.

In the Full Image mode with PiP enabled, you can generate a combined image of the full 360/180 image with screen resolution and a superimposed fragment with real camera resolution.

 

The Real frame size option allows you to generate the full image from Fisheye cameras with real camera resolution exceeding screen resolution. Images from Fisheye cameras with resolutions of tens of megapixels can be modeled as a whole, as well as images from usual megapixel cameras.

 

Dewarped fragment with real camera resolution

 

By rotation the camera in the usual way, you can view images from the Fisheye camera in different directions in the 3D Video. In this case, the view area will be limited at 180 degrees from the main optical axis of the lens. Beyond this limit the image is cut.

 

Image resolution of a Fisheye camera is determined by the Number of pixels of sensor

Lens focal length and Image size at image processing have no affect on the image resolution of a Fisheye camera.

 

You can change the Lens focal length, thereby changing the field of view size, but the image resolution in the 3D Video will be always maintained equal to  the calculated resolution of the Fisheye camera.

If the calculated resolution is worse, the resolution of the 3D Video will be artificially reduced. If the calculated resolution is better, then the PiP mode will be launched in the 3D Video.

The Image line in the Titles displays a virtual number of pixels for correct simulation of the resolution.

In the Dewarped fragment mode distortion of a Fisheye camera images in the 3D Video is not modeled.

The simulated resolution is exact only at the center of the frame. Towards the edges of the frame the actual resolution is worse than simulated. The smaller the view angle, the more accuracy of simulating resolution on the edges of the frame.

For a more realistic model of the image, turn on modeling compression and smoothing, or set the actual resolution of the lens (for accurate simulation the lens resolution you also need to specify the correct size of the image sensor).

 

Several fragments from Fisheye camera on one image

 

You can save the camera positions corresponding to the fragments of the image as camera positions and get these fragments on one image in the screen division mode. The resolution of each fragment on the multi-image will be limited by resolution of the Fisheye camera.

 

To enable displaying positions as fragments of Fisheye camera, select Positions> Show> Positions and Fisheye> Show> Dewarped Image Fragment on the Panoramic tab of the Image Parameter Panel.

 

See more.Positions of active camera

 

 

Models of Fisheye cameras

 

To make a camera model a Fisheye camera it is necessary:

 

Assign fisheye to the parameter Lens>Type to model the camera as panoramic.
Assign panoramic to the parameter Type>Fixed, PTZ,Dome, Mini to draw the camera using the special icons or in the Graphics window.

 

See also: Modeling Fisheye cameras,Positions of active camera