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aous72 / OpenJPH

Open-source implementation of JPEG2000 Part-15 (or JPH or HTJ2K)
BSD 2-Clause "Simplified" License
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Feature: Support ROI based rendering #112

Open chafey opened 11 months ago

chafey commented 11 months ago

Currently OpenJPH supports full image frame decoding. This works great for standard image sizes but does not work for very large size images (e.g. > 10,000 width x 10,000 height) as is found in Digital Pathology and satellite imaging. For these large images, the ability to extract a region of interest (ROI) is required to access the full resolution data without exhausting memory (and using unnecessary compute). This functionality is also a requirement to support JPIP. JPIP window rendering functionality would be a good source of requirements for the ROI rendering API (e.g. how to specify the ROI, resolution, quality)

Note this functionality would also require being able to support sparse cacheing/reading of HTJ2K bitstreams to minimize memory use. This could be done by reading from the file itself directly or over the network via JPIP or HTTP Byte streams

aous72 commented 11 months ago

Hi Chris,

Thank you for putting this in. I think it is useful to have this. I will try to do it in the next few weeks.

Cheers, Aous.