Image processing of computerised visual field data.

New approach to estimating variability in visual field data using an image processing technique.

AIMS A new framework for evaluating pointwise sensitivity variation in computerised visual field data is demonstrated. METHODS A measure of local spatial variability (LSV) is generated using an image processing technique. Fifty five eyes from a sample of normal and glaucomatous subjects, examined on the Humphrey field analyser (HFA), were used to illustrate the method. RESULTS Significant c...

Sampling systems for visual field assessment and computerised perimetry.

Three successive stages in the representations of the visual image are studied by computations from the best available data. The results are embodied in projections, drawn automatically. These projections are related to the assessment of visual disability and the dimensions of lesions in the retina and visual pathway. Fields can be assessed visually with the aid of graticules or directly during...

Visual Colour Image Processing

In this paper, we propose a colour image processing method by combining modern signal processing technique with knowledge about the properties of the human colour vision system. Colour signals are processed differently according to their visual importance. The emphasis of the technique is on the preservation of total visual quality of the image and simultaneously taking into account computation...

Computerised evaluation of visual fields.

This report describes a method for conversion of visual fields from Goldmann perimeter charts to computer use, including area calculation, graphic display, and storage in the patient's data base. The computer program enables one to calculate and display several isoptres of each chart, as well as visual fields with scotomas or composed of islands. This method makes it possible to follow in an ac...

Computerised image handling in pathology.