Scanning camera
With scanning cameras , an increase in resolution is achieved by moving the CCD sensor in the camera housing. Using this method, attempts were made up to the year 2000 to increase the resolution of digital cameras , which at that time was still insufficient . There were essentially three different principles:
- Micro scanning : Several images are recorded, whereby the sensor is shifted in the area of less than one pixel each (see subpixel ). A new image with a higher resolution is interpolated from the resulting images.
- Macro Scanning : CCD line sensor is moved mechanically over an image area that is many times larger than its dimensions (cf. scanner camera ). This principle finds z. B. Use with the Zeiss UMK HighScan. Here, the image format of the analog aerial photography camera from Zeiss of 120 mm × 166 mm is scanned by four movable CCD sensors that run in parallel. The result is an image size of 15,000 × 11,000 pixels .
- Réseau Scanning : A CCD area sensor is shifted so that four réseau crosses arealwaysdisplayed. The réseau crosses areilluminatedby an LED and measured automatically.