istar Panoramas for HDS Point Clouds
istar Panoramas for HDS Point Clouds Why use istar Panoramas for HDS Point Clouds Taking the Photographs Fitting the Panorama with ColourCloud Creating the Equirectangular and Cube Images with Immersive Studio Importing the Cube Images into Cyclone
Why use istar Panoramas for HDS Point Clouds The colours of the points in the Point Cloud are determined by the intensity of the received reflected laser This information is useful in its own right but for some applications it is desirable to attribute the natural colours to the points Although many scanners have a photographic capability, using an external camera provides greater control
Taking the Photographs Camera Height The height of the lens centres of the istar must match that of the Scanner Adaptors are provided with the istar and the appropriate adaptor must be used
Taking the Photographs Camera Height Three Adaptors are provided with the istar Adaptors B and C are used with Adaptor A to increase the height for use with HDS6000 and HDS7000 Scanners C10, C5, P20 Adaptor A HDS7000 Adaptors A + C HDS6000 Adaptors A + B
Taking the Photographs Using the istar The istar is switched on by touching the corners of the screen following the sequence shown if the screen is touched centrally The istar logo is shown while the camera boots up The Main Menu is used to select: Image Capture Take the photographs Image Review View images on the istar Compass and Tilt Settings Configure your requirements
Taking the Photographs Image Capture Selecting the Image Capture option at the Main Menu will bring you to the equivalent of the shutter button on a conventional camera Take the photographs using the count down timer so you are not recorded in the images This interval is set from the Settings Menu The Walk Around Mode enables you to record the images in two halves so you are not recorded in the images select the arrow pointing to the corner you are by then follow the on-screen instructions Live View Mode provides a live immersive view of the scene from the istar
Taking the Photographs Settings Use the settings options to control the number of exposures for a panorama, set the time out and power off options and image format General Settings Time and Date Settings Capture Settings Exposure + Countdown Display Settings Power Off + timeout Ethernet Settings Wi-Fi Settings
Taking the Photographs Exposure In even lighting conditions, such as an overcast day, a single exposure may be sufficient to capture the scene, but where lighting conditions are significantly variable the istar s ability to shoot multiple images for HDR should be used The HDR options are Off, 3 or Auto Auto will usually provide the best solution The ISO value can be set manually from 100 through to 25600 Opens the Tilt and Orientation screen
Taking the Photographs Exposure The next slide shows three images, the left image shows the exposure set for the centre of the image, the middle one with the exposer set for the inside of the structure and the right one using HDR Tap the centre camera icon to start Tap a corner and stand back for image capture Tap the image of the camera on a green background to start the countdown
Taking the Photographs Exposure
Taking the Photographs White Balance Colour casts can be apparent in the resulting images, especially in bright sunlight or artificial lighting, which can be corrected for by selecting the Exposure option to suit the light source The options are : Manual, where the Shutter Speed is set by the user Outdoors Indoors Front Outdoors Front Indoors
Fitting the Panorama with ColourCloud Place the *.e57 (cleaned Laser Scan) and *.nctri (istar image taken coincident with the scan) files in a folder in the ColourCloud directory on the C: drive of the computer Launch ColourCloud Browse to the directory Click Process
Fitting the Panorama with ColourCloud ColourCloud reports each action and the time taken as it processes the data to create a new *-istar.e57 file with the colours burnt into the file with precise alignment
Creating the Equirectangular and Cube Images Immersive Studio Launch Immersive Studio and select Process Images
Creating the Equirectangular and Cube Images Immersive Studio Use Select Image Folder to select the images for processing Chose an Output Directory for the results Check Process HDR if HDR has been used Check Export to Cube Faces Check Stitch Images Click Process
Creating the Equirectangular and Cube Images Immersive Studio The Status will display Processing then change to Done when complete The Cube Images will be in the directory specified as the Output Directory ready for import into Cyclone
Importing the Cube Images into Cyclone Open the Scan World, right click on the Images folder and select Import Browse to the folder that holds the Cube Images and highlight all 6 Click Open
Importing the Cube Images into Cyclone Open the Model Space containing the Point Clouds that are to be texture mapped Use the Pick Mode tool to select the Model Space to be texture mapped Select Edit Object \ Appearance > \ Texture Map Browser Click the Add Cube Map Images icon on the Texture Map Browser Browse to and highlight the Images folder that contains the Cube Images in the Select Project with Cube Map Images panel
Importing the Cube Images into Cyclone Click OK The Texture Editor together with the Back Cube Image should be displayed (This may take a few seconds, especially if 4096 x 4096 Cube Images are being used) Navigate in the Model Space to where the first Matching Point is to be selected Click on the Cube Image to select the Pick (Notice the zoom to enable accurate picking) Use the Pick Mode tool to select the same point in the Model Space Click the Add Constraints icon in the Texture Editor: panel
Importing the Cube Images into Cyclone The Constraint is added to the Texture Editor: with the appropriate Cube Image name Right click the Cube Image to select a different one from the Menu as required Repeat the process by selecting a Pick in the Cube Image then in the Model Space for additional constraint Points (A minimum of three matching Picks is required)
Importing the Cube Images into Cyclone Once a minimum of three Picks are selected, the Compute icon will become live Click the Compute icon in the Texture Editor: when three or more points have been matched Close the Texture Editor: and Texture Map Browser Ensure that the Global Texture Map option in View is active Use the Pick Mode tool to select the Model Space Select Edit Object \ Appearance > \ Apply Colour Map > \ Image Texture Map
istar Panoramas for HDS Point Clouds