Effect of pixel size and compression on metric quality of digital aerial images

Juha Jaakkola; Eija Honkavaara

doi:10.1117/12.182908

17 August 1994 Effect of pixel size and compression on metric quality of digital aerial images

Juha Jaakkola, Eija Honkavaara

Proceedings Volume 2357, ISPRS Commission III Symposium: Spatial Information from Digital Photogrammetry and Computer Vision; (1994) https://doi.org/10.1117/12.182908
Event: Spatial Information from Digital Photogrammetry and Computer Vision: ISPRS Commission III Symposium, 1994, Munich, Germany

Abstract

The effect of memory space reduction methods on metric quality of digital aerial images has been investigated. The methods used to reduce the data volume are increasing the pixel size and compressing the image by JPEG and ALP (adaptive Laplacian pyramid). Metric image quality was investigated on different objects using different measuring methods. The quality was examined by defining absolute errors and relative changes of the images. Choosing the pixel size, compression method, and compression ratio depends on the application. Important factors to be noted are the required accuracy, measuring method, and the size and type of the objects to be measured. On the test data (7.5 micrometers images) the pixel size could be doubled to 15 micrometers and compression ratio 1:10 used without any remarkable effect on the metric quality of the image. For most photogrammetric applications the pixel size 15 - 30 micrometers would be appropriate. When reduction was 1:1...1:10, compression methods caused smaller distortions than increasing the pixel size. However, when the reduction was bigger, the optimal result was achieved using larger pixel size and light compression.

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Juha Jaakkola and Eija Honkavaara "Effect of pixel size and compression on metric quality of digital aerial images", Proc. SPIE 2357, ISPRS Commission III Symposium: Spatial Information from Digital Photogrammetry and Computer Vision, (17 August 1994); https://doi.org/10.1117/12.182908

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KEYWORDS

Image compression

Aluminium phosphide

Image quality

Image filtering

Image resolution

Visualization

Analog electronics

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