High dynamic range processing
AssigneeGvbb Holdings S.A.R.L.
InventorsJeroen Rotte, Dirk Snoeck-Henkemans, Petrus Gijsbertus Centen
Life of this patent
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Abstract
An apparatus for HDR image processing is provided. The apparatus determines an imaging sensitivity value. The apparatus then compares subsets of imaging information with the determined imaging sensitivity value and applies a gamma correction to each subset of imaging information using a gamma low contrast curve or a gamma high contrast curve based on the comparison to obtain the gamma corrected subset of imaging information.
Claims29
An image processor for adjusting luminosity of a high-dynamic range (HDR) image based on imaging sensitivity of a device configured to display the HDR image, the image processor comprising:
- electronic memory configured to store at least one gamma low contrast curve and at least one a gamma high contrast curve;
- an imaging apparatus for generating image data of a captured HDR image;
- an imaging sensitivity determiner configured to determine an imaging sensitivity value of a display device based on a input value of the display device that provides a predetermined output luminance at the display device;
- an image information comparator configured to compare the determined imaging sensitivity value of the display device with a luminance value of the generated image data;
- a gamma curve selector configured to select the at least one gamma low contrast curve when the luminance value is less than the determined imaging sensitivity value of the display device and select the at least one gamma high contrast curve when the luminance value is greater than the determined imaging sensitivity value of the display device;
- an image corrector configured to correct the image data of the captured HDR image by applying the selected at least one gamma high contrast curve or the selected at least one gamma low contrast curve to the generated image data to adjust the luminosity of the HDR image;
- and
- an image display configured display the adjusted HDR image on the display device,
- wherein the imaging sensitivity determiner is configured to determine the imaging sensitivity value of the display device when the input value results in the predetermined output luminance as a set breakpoint of candela per square meter (cd/m2) at the display device.
An image processor for adjusting luminosity of a high-dynamic range (HDR) image based on imaging sensitivity of a device configured to display the HDR image, the image processing system comprising:
- electronic memory for storing a plurality of gamma contrast curves;
- an imaging apparatus for generating image data of a captured HDR image;
- an imaging sensitivity determiner configured to determine an imaging sensitivity value of a display device;
- an image information comparator configured to compare the determined imaging sensitivity value of the display device with a luminance value of the generated image data to generate a gamma curve selection determination;
- an image data converter configured to convert the generated image data from linear imaging information to logarithmic imaging information, with the luminance value being determined from the logarithmic imaging information;
- a gamma curve selector configured to select at least one gamma contrast curve from the plurality of gamma contrast curves based on the generated gamma curve selection determination;
- and
- an image corrector configured to correct the image data of the captured HDR image by applying the selected at least one gamma contrast curve to the generated image data to adjust the luminosity of the HDR image.
An image processor for setting a luminosity of an image based on an imaging sensitivity of a display device, the image processor comprising:
- a luminance adjustment selector configured to select at least one luminance adjustment modifier by comparing a luminance of a captured image with an imaging sensitivity of a display device to determine an optimal luminance level for the captured image when displayed on the display device, wherein the luminance adjustment selector selects at least one gamma low contrast curve when the luminance of the captured image is less than the imaging sensitivity and at least one gamma high contrast curve when the luminance of the captured image is greater than the imaging sensitivity;
- and
- an image enhancer configured to generate an enhanced image by applying the selected at least one gamma high contrast curve or the selected at least one gamma low contrast curve to the captured image, such that the generated enhanced image is configured with the optimal luminance level when displayed on the display device;
- and
- an image display of the display device that is configured to display the generated enhanced image.
Dependencies are inferred from the claim text.