Tone mapping

About: Tone mapping is a research topic. Over the lifetime, 1713 publications have been published within this topic receiving 48490 citations.

Non-linear tone mapping apparatus and method and computer readable medium stored thereon computer executable instructions for performing the method

Abstract: The present invention provides non-linear tone mapping apparatus and method and a computer readable medium stored thereon computer executable instructions for performing the method The non-linear tone mapping apparatus according to the present invention comprises a luminance value computing unit for computing a luminance value of each pixel of an object image using an image information of each pixel; a computing unit for computing a light adaptive value of each pixel using the image information and luminance value of each pixel, the light adaptive value representing the degree of response to brightness of the image in the image information of each pixel; and a converting unit for converting the image information of each pixel of the object image using a ratio of the image information of each pixel to the light adaptive value

Image quality improvement of multi-projection 3D display through tone mapping based optimization

Abstract: An optical 3D screen usually shows a certain diffuse reflectivity or diffuse transmission, and the multi-projection 3D display suffers from decreased display local contrast due to the crosstalk of multi-projection contents. A tone mapping based optimizing method is innovatively proposed to suppress the crosstalk and improve the display contrast by minimizing the visible contrast distortions between the display light field and a targeted one with enhanced contrast. The contrast distortions are weighted according to the visibility predicted by the model of human visual system, and the distortions are minimized for the given multi-projection 3D display model that enforces constrains on the solution. Our proposed method can adjust parallax images or parallax video contents for the optimum 3D display image quality taking into account the display characteristics and ambient illumination. The validity of the method is evaluated and proved in experiments.

Brightness stratification-based quick trilateral filter tone mapping method

Abstract: The invention relates to a brightness stratification-based quick trilateral filter tone mapping method and belongs to the technical field of digital image processing Compared with the conventional trilateral filter tone mapping method, the method is improved only on the acquisition way of a smoothed horizontal gradient image L'x(p) and a smoothed vertical gradient image L'y(p) by: grading the pixel values of a horizontal gradient image L'x(p) and obtaining an image Wk(p) and an image Jk(p) according to formulae of Wk(p)=s(Lx(p)-Ik) and Jk(p)=Wk(p)Ix(p); performing smoothing treatment of thehorizontal gradient image L'x(p) by using the image Wk(p) and the image Jk(p) to obtain the smoothed horizontal gradient image L'x(p); and acquiring the smoothed vertical gradient image L'y(p) in thesame way Compared with the conventional trilateral filter tone mapping method, the method of the invention has the advantages of high processing speed and insusceptibility to image detail loss

A fast tone reproduction algorithm for high dynamic range image display

Abstract: This paper presents a simple, parameter-free solution for the tone reproduction of high dynamic range images on conventional display devices. Both theoretical analysis and experiments with a wide variety of images have shown that this algorithm produces compelling results by revealing details from the dark regions while preserving the contrast of the bright regions of an image. We also introduce an enhanced operator to improve the contrast of the bright regions.