Method for converting input image data into output image data, image conversion unit for converting input image data into output image data, image processing apparatus, display device
First Claim
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1. A method for converting input image data into output image data comprising the act of:
- splitting the input image data into at least two signals, a first signal comprising regional contrast data and a second signal comprising detail data;
stretching a dynamic range of the first signal to provide a stretched first signal;
stretching a dynamic range of the second signal to provide a stretched second signal, wherein the dynamic range of the first signal is stretched to a higher degree than the dynamic range of the second signal;
combining the stretched first and second signals to from a combined signal;
analyzing the input image signal to identify groups of pixels forming highlights in the image, wherein the dynamic range of an output signal is bound by an upper value,converting pixel data for said identified groups of pixels are converted into a third signal such that the third signal covers a dynamic range extending upwards above the said upper value to an upper maximum pixel value; and
combining the third signal with the combined signal to form the output signal; and
outputting the output signal.
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Abstract
In a method, unit and display device the input image signal is split into a regional contrast signal (VRC) and a detail signal (VD), followed by stretching separately the dynamic ranges for both signals, wherein the dynamic range for the regional contrast signal is stretched with a higher stretch ratio than the dynamic range for the detail signal. Preferably the stretch ratio for the detail signal is near 1 or preferably 1. In preferred embodiment highlights are identified and for the highlights the dynamic range is stretched to an even higher degree than for the regional contrast signal.
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Citations
11 Claims
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1. A method for converting input image data into output image data comprising the act of:
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splitting the input image data into at least two signals, a first signal comprising regional contrast data and a second signal comprising detail data; stretching a dynamic range of the first signal to provide a stretched first signal; stretching a dynamic range of the second signal to provide a stretched second signal, wherein the dynamic range of the first signal is stretched to a higher degree than the dynamic range of the second signal; combining the stretched first and second signals to from a combined signal; analyzing the input image signal to identify groups of pixels forming highlights in the image, wherein the dynamic range of an output signal is bound by an upper value, converting pixel data for said identified groups of pixels are converted into a third signal such that the third signal covers a dynamic range extending upwards above the said upper value to an upper maximum pixel value; and combining the third signal with the combined signal to form the output signal; and outputting the output signal. - View Dependent Claims (2, 3, 4)
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5. A non-transitory computer readable medium comprising computer instructions which, when executed by a computer, configure the computer to perform a method for converting input image data into output image data, the method comprising the acts of:
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splitting the input image data into at least two signals, a first signal comprising regional contrast data and a second signal comprising detail data; stretching a dynamic range of the first signal to provide a stretched first signal; stretching a dynamic range of the second signal to provide a stretched second signal, wherein the dynamic range of the first signal is stretched to a higher degree than the dynamic range of the second signal; combining the stretched first and second signals to from a combined signal; analyzing the input image signal to identify groups of pixels forming highlights in the image, wherein the dynamic range of an output signal is bound by an upper value, converting pixel data for said identified groups of pixels are converted into a third signal such that the third signal covers a dynamic range extending upwards above the said upper value to an upper maximum pixel value; and combining the third signal with the combined signal to form the output signal; and outputting the output signal.
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6. An image conversion unit for converting input image data into output image data, comprising:
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a splitter configured to split the input image data into at least two signals, a first signal comprising regional contrast data and a second signal comprising detail data; a stretcher configured to stretch the dynamic range of at least the first signal to provide a stretched first signal, wherein the dynamic range of the first signal is stretched to a higher degree than applied to the second signal; a combiner configured to combine the stretched first and second signals to from a combined signal; an identifier configured to analyze the input image signal and to identify groups of pixels forming highlights in the image, wherein the dynamic range of an output signal is bound by an upper value, a mapper configured to map pixel data for said identified groups of pixels into a third signal such that the third signal covers a dynamic range extending upwards above the said upper value to an upper maximum pixel value; and a further combiner configured to combine the third signal with the combined signal to form the output signal. - View Dependent Claims (7, 8)
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9. A display device comprising an image processing apparatus comprising:
- a receiver configured to receive input image data;
an image conversion unit configured to convert the input image data into output image data; and a display screen configured to render the output image data, wherein the image conversion unit comprises; a splitter configured to split the input image data into at least two signals, a first signal comprising regional contrast data and a second signal comprising detail data; a stretcher configured to stretch the dynamic range of at least the first signal to provide a stretched first signal, wherein the dynamic range of the first signal is stretched to a higher degree than applied to the second signal; a combiner configured to combine the stretched first and second signals to from a combined signal; an identifier configured to analyze the input image signal and to identify groups of pixels forming highlights in the image, wherein the dynamic range of an output signal is bound by an upper value, a mapper configured to map pixel data for said identified groups of pixels into a third signal such that the third signal covers a dynamic range extending upwards above the said upper value to an upper maximum pixel value; and a further combiner configured to combine the third signal with the combined signal to form the output signal. - View Dependent Claims (10, 11)
- a receiver configured to receive input image data;
Specification