Viewing wide angle images using dynamic tone mapping

Details Viewing wide angle images using dynamic tone mapping Viewing wide angle images using dynamic tone mapping

2011-07-19

2011-07-19

Mehta, Bhavesh M (Department: 2624)

Image analysis

Image enhancement or restoration

C382S100000, C382S274000

Reexamination Certificate

active

07983502

ABSTRACT:
A dynamic tone mapping technique is presented that produces a local tone map for a sub-image of a wide-angle, high dynamic range (HDR), which is used in rendering the sub-image for display. The technique generally involves first computing a global tone map of the wide-angle, HDR image in advance of rendering the sub-image. The global tone map is then used during rendering to compute a local tone map based on the average luminance and contrast of the pixels of the sub-image. In addition, the sub-image can be tone mapped as part of the rendering of a sequence of sub-images during a viewer-executed panning and/or zooming session. In this case, the local tone maps can be kept from changing too rapidly by adding a hysteresis feature to smooth out the intensity changes between successive sub-images.

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