This pilot project demonstrates the potential for JPEG compression within a digital teleophthalmology viewing system. These results indicate that JPEG compression at ratios as high as 113:1 has the potential to reduce storage requirements without interfering with the accurate and reproducible teleophthalmologic diagnosis of diabetic retinopathy. The application of JPEG compression at ratios of 55:1 and 113:1 did not significantly interfere with the identification of specific diabetic retinal pathology, diagnosis of level of retinopathy or recommended follow-up. Compress jpg-file to: (from 1 KB to 30.0 MB, default value is 200 KB) Compress jpg-file by: (can be specified from 1 to 99) Size reducing in megapixels: (Limiting the size to about 3-5 Megapixels. Reproducibility was good to excellent at both compression levels for the identification of diabetic retinal abnormalities (K = 0.45-1), diagnosis of level of retinopathy (kappa = 0.73-1) and recommended follow-up (kappa = 0.64-1). 1) Select image in BMP, GIF, JPEG, PNG, TIFF format: 2) Settings for jpeg-file compression to the desired size in kilobytes or in percentages. Exact agreement and weighted kappa statistics, a measure of reproducibility, were calculated.Įxact agreement between the compressed JPEG images and the TIFF images was high (75% to 100%) for all measured variables at both compression levels. The level of diabetic retinopathy and recommendations for clinical follow-up were also recorded. A reviewer in Edmonton randomly viewed all original TIFF images along with the compressed JPEG images in a masked fashion for image quality and for specific diabetic retinal pathology in accordance with Early Treatment Diabetic Retinopathy Study standards. The files were compressed approximately 55x and 113x their original size using JPEG compression. Following pupil dilation, seven 30 degrees fields of each fundus were digitally photographed at a resolution of 2008 x 3040 pixels and saved in uncompressed tagged image file format (TIFF). We investigated the application of Joint Photographic Experts Group (PEG) compression to digital retinal images to determine whether JPEG compression could reduce file sizes while maintaining sufficient quality and detail to accurately diagnose diabetic retinopathy.Īll 20 patients with type 2 diabetes mellitus assessed at a 1-day teleophthalmology clinic in northern Alberta were enrolled in the study. Teleophthalmology may provide a solution to overcome this problem. Canada's vast size and remote rural communities represent a significant hurdle for successful monitoring and evaluation of diabetic retinopathy.
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