67results about How to "Increase brightness level" patented technology

The invention provides a human visual perception simulation-based self-adaptive low-illumination image enhancement method. The method is put forwards based on characteristics of low brightness and low contrast of a low-illumination color image and through researching an automatic adjustment process of pupils and photoreceptor cells for an environment. The method includes the following steps that: the adjustment process of the pupils for light is simulated, and the total brightness level of the image is improved; and the self-adaptive adjustment and control ability of eye vision for a low-illumination environment is simulated, and a nonlinear mapping model is designed to simulate the adjustment process of rod cells and cone cells, so that a bright and dark self-adaptation function can be obtained, and a bright and dark information fusing function is determined according to illumination distribution, and global self-adaptive adjustment is performed on brightness components; and the local contrast of the enhanced brightness image will be decreased, so that local self-adaptive contrast enforcement is performed on the image through adopting an exponential function; and finally, and color restoration is performed on the enhanced image. With the human visual perception simulation-based self-adaptive low-illumination image enhancement method of the invention adopted, the brightness, local contrast and detail information of the low-illumination color image can be effectively improved, and especially, the method has obvious effects in dark area and highlight area enhancement.

Disclosed is an illuminating optical system, which has a small etendue, longer service life, and a higher luminance. The system is provided with: a laser light source, which generates excitation light; a fluorescent body, which generates fluorescence when the excitation light is applied; a light tunnel, through which the excitation light inputted from one end is outputted from the other end toward the fluorescent body, and the fluorescence generated by means of the fluorescent body is outputted from said one end; and a dichroic mirror, which is provided between the laser light source and the light tunnel, and passes through the fluorescence or the excitation light, and reflects the other.

A display device includes: a wall defining a viewer-side space; an observed object arranged in an object-side space partitioned off the viewer-side space by a portion of the wall; an imaging optical system of real specular image including a semitransparent substrate with a plane of symmetry for defining the viewer-side space and the object-side space as the portion of the wall to image a real image of the observed object in the viewer-side space with light passing through the substrate; a screen surface having a function of diffuse reflection and provided with the substrate so as to face the viewer-side space; and a projector optical system projecting an image on the screen surface in the viewer-side space.