Influence of Image TIFF Format and JPEG Compression Level in the Accuracy of the 3D Model and Quality of the Orthophoto in UAV Photogrammetry

The aim of this study is to evaluate the degradation of the accuracy and quality of the images in relation to the TIFF format and the different compression level of the JPEG format compared to the raw images acquired by UAV platform. Experiments were carried out using DJI Mavic 2 Pro and Hasselblad L1D-20c camera on three test sites. Post-processing of images was performed using software based on structure from motion and multi-view stereo approaches. The results show a slight influence of image format and compression levels in flat or slightly flat surfaces; in the case of a complex 3D model, instead, the choice of a format became important. Across all tests, processing times were found to also play a key role, especially in point cloud generation. The qualitative and quantitative analysis, carried out on the different orthophotos, allowed to highlight a modest impact in the use of the TIFF format and a strong influence as the JPEG compression level increases.

Read and Write Support for MevisLab Dicom/Tiff Format

MevisLab [2] is a development environment for medical image processing and visualization, which supports the reading and writing of combined dicom/tiff images. In this document we provide the source code (ImageIO factory) for the Insight Toolkit (ITK) framework [4]. This image IO plugin supports 2D, 3D and 4D scalar images.Note: this class depends on version GDCM 2.0 and above.

MORPHIAS: Molecular Phenotyping Image Analysis System

Visualizing metabolic phenotypes, tracking phenotype dynamics, and screening molecular interventions all require comprehensive, quantitative measures of micromolecular patterns across cell classes. In this project we develop an easy-to-use interface that permits the same sequence of operations as described in Marc and Jones [1] and is based on Cell Kit developed by Marc’s lab. Work products for this project include: user application software (Matlab), user manual and if possible, a web portal interface to allow internet access and application of the system. The MORPHIAS system will be implemented by means of a Matlab function which creates a GUI which allows the user to import molecular signature images (in TIFF format), and then to perform classification using a clustering algorithm, and to then perform data analysis on the result.

Photoshop and 12-bit Digital Microscope Camera Images

One problem facing owners of high-end digital microscope cameras and scanners is dealing with 12-bit TIFF format images. Because of a vagueness in the TIFF specification [1], some prograins do not load 12-bit TIFF images at all, or do not handle them gracefully. Unfortunately, Adobe Photoshop is one such program.A common problem with 12-bit images that do load in Photoshop is that the image appears to be totally black once loaded. This occurs when the camera stores the most significant bits of the image in the lower 12-bits of a 16-bit data space. Photoshop, when converting to its internal 16-bit representation, does not scale these properly, resulting in a low contrast image. This can present problems with viewing the images, or performing any processing or measurement steps that you might desire.

Papyrusdigitalisierung in Gießen

Ziel der 1999 bis 2001 von der DFG geförderten Digitalisierung der Gießener Papyri war die datenbankgestützte Digitalisierung, Erschließung und Bereitstellung der Sammlung im WWW. Die überprüften, korrigierten und ergänzten Datenbankeinträge beruhen auf den formalen und bibliographischen Angaben der in der Nachkriegszeit angelegten Inventare. Darüber hinaus wurden in Aufsätzen oder Monographien edierte Papyri inhaltlich erschlossen. Katalogisate dokumentarischer Papyri wurden mit ihren Einträgen im Heidelberger Gesamtverzeichnis der griechischen Papyrusurkunden Ägyptens und den über die Duke Database of Documentary Papyri erreichbaren Volltexten verlinkt. Die Datenbank basiert auf dem allegro-gestützten Programm HANS. Für die Digitalisierung wurden die verglasten Papyri verfilmt und im TIFF-Format auf CD-ROM gespeichert. Die WWW-Präsentation bietet die Digitalisiate im niedriger auflösenden JPEG-Format an.

Diagnosis of glaucoma using telemedicine – the effect of compression on the evaluation of optic nerve head cup–disc ratio

A photograph of the optic nerve head requires a lot of disk space (over 1 MByte) for storage and may require substantial bandwidth and time for transmission to a remote practitioner for a second opinion. To test whether compression degrades the image quality of the images, 302 slides were digitized at an optical resolution of 2400 pixels/inch (945 pixels/cm) and 30 bit/pixel. The images were saved both in non-compressed TIFF format and in compressed JPEG (compression ratio of 60) format. A blinded observer measured the optic nerve head cup–disc ratio for all three groups: the original slides, uncompressed TIFF and compressed JPEG images. The results showed that digital images were less accurate than slides. However, compression, even up to a ratio of 40, did not make matters worse.

HUBBLE SPACE TELESCOPE VIA THE WEB

The Space Telescope Science Institute (STScI) makes available a wide variety of information concerning the Hubble Space Telescope (HST) via the Space Telescope Electronic Information Service (STEIS). STEIS is accessible via anonymous ftp, gopher, WAIS, and WWW. The information on STEIS includes how to propose for time on the HST, the current status of HST, reports on the scientific instruments, the observing schedule, data reduction software, calibration files, and a set of publicly available images in JPEG, GIF and TIFF format. STEIS serves both the astronomical community as well as the larger Internet community. WWW is currently the most widely used interface to STEIS. Future developments on STEIS are expected to include larger amounts of hypertext, especially HST images and educational material of interest to students, educators, and the general public, and the ability to query proposal status.