MUMBAI, India, Sept. 22 -- Intellectual Property India has published a patent application (202647101810 A) filed by Koninklijke Philips N. V. on August 24, 2026, for Encoding And Decoding For Images.
Inventor includes Tichelaar, Johannes Yzebrand.
The application for the patent was published on September 18, 2026, under issue no. 38/2026.
Abstract: To obtain better color control in dynamic range mappings, which are e.g. useful in particular for HDR image coding and communication, the inventor proposes, for a corresponding innovative decoder, an encoder for encoding an original image (Im_MAST) of pixels, wherein a pixel has a primary brightness, wherein the original image is represented as a different communication image (Im_COMM) having for the pixel a secondary brightness, wherein the secondary brightness lies within a secondary range having a lower maximum brightnesses (ML_C) than an original maximum brightness (ML_V) of a primary range of the primary brightness, wherein the encoder comprises a first circuit (600) arranged to calculate an initial approximation of the secondary brightness (Y'_Ek_SDR) for a pixel being processed, the first circuit comprising: a largest color component determining circuit (506) arranged to for the pixel determine which is the largest one of a red, green and blue color component representing a color of the pixel, and outputting such largest color component (LC_i); a weight determination circuit (508) arranged to obtain a value of a control parameter (Ksi) and to calculate a first weight (A) by taking the minimum of the constant 1.0 and a result of a multiplication of the control parameter by a first intermediate value which is equal to the value of a second intermediate value minus 1.0, wherein the second intermediate value equals a division of the largest color component by an input luma (Y'_i) of the pixel; wherein the weight determination circuit is arranged to output the first weight and a second weight which is equal to 1.0 minus the first weight; a first multiplier determination circuit (604) arranged to output a luma-dependent multiplier (gd(Y')) which depends on the value of the input luma; a second multiplier determination circuit (607) arranged to output a largest component- dependent multiplier (gd(LC)) which depends on the value of the largest color component (LC_i); a first multiplication circuit (510) arranged to obtain a weighted luma multiplier (gd_W) by multiplying the luma-dependent multiplier (gd(Y')) by the second weight (1-A); a second multiplication circuit (511) arranged to obtain a weighted largest component multiplier (gd_LCW) by multiplying the largest component-dependent multiplier (gd(LC)) by the first weight (A); an adder (512) arranged to add the weighted largest component multiplier (gd_LCW) to the weighted luma multiplier (gd_W) to obtain a final multiplier (gFe); and a scaling multiplication circuit (513) to obtain the initial approximation of the secondary brightness (Y'_Ek_SDR) by multiplying the final multiplier (gFe) by the input luma (Y'_i); wherein the image encoder comprises a second circuit (700) arranged to yield an improved accuracy second approximation of the secondary brightness (Y'_iko) on the basis of a difference (DEL) between the input luma and an estimate of the input luma derived by luminance up- mapping the initial approximation of the secondary brightness (Y'_Ek_SDR) with a reciprocal value of the final multiplier (gFe).
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