69results about How to "Uniform resolution" patented technology

The present invention corrects the insufficient peripheral light amount due to the lens shading and correcting the non-uniformity of light amount at the periphery due to a distortion resulting from a precision of the lens or a poor mounting precision of the lens. A peripheral light amount correction circuit is structured by an image synchronization signal generation circuit, a coordinate conversion circuit and a luminance value correction computing circuit. An integrated value of luminance values is calculated at the coordinate conversion circuit to extract light amount information. Coordinate values to be input to the luminance value correction computing circuit are generated based on an integrated / averaged value of the light amount information. In the luminance value correction computing circuit, peripheral light amount correction functions are converted based on the input coordinate values from the coordinate conversion circuit to perform appropriate correction on the input image.

The invention relates to a method for designing an optical system as an oblique camera lens. The method comprises: an initial system consisting of an primary initial mirror, an initial secondary mirror, and an initial third mirror is established; a new object-image relationship is established, a plurality of first characteristic light rays are selected, the plurality of first characteristic lightrays are tracked forwardly from object space to an image sensor, a plurality of characteristic data points of a to-be-calculated third reflector are calculated based on the plurality of first characteristic light rays and the new object-image relationship while the primary initial mirror and the initial secondary mirror are kept to be unchanged, and curved-surface fitting is carried out on the plurality of characteristic data points to obtain a third reflector; and a plurality of view fields and a plurality of second characteristic light rays are selected, the plurality of second characteristic light rays are tracked to the object space reversely from the image sensor, a plurality of second characteristic data points of a to-be-calculated primary reflector are calculated based on the plurality of second characteristic light rays and the new object-image relationship, and curved-surface fitting is carried out on the plurality of second characteristic data points to obtain a primary reflector.

A oblique camera lens includes: a primary mirror configured to reflect a light ray to form a first reflected light; a secondary mirror located on a first path of light reflected from the primary mirror and configured to reflect the first reflected light to form a second reflected light; a tertiary mirror located on a second path of light reflected from the secondary mirror and configured to reflect the second reflected light to form a third reflected light; and an image sensor located on a third path of light reflected from the tertiary mirror and configured to receive the third reflected light; wherein each of the first reflecting surface and the third reflecting surface is a sixth order xy polynomial freeform surface; and a field of view of oblique camera lens in an Y-axis direction is greater or equal to 35° and less than or equal to 65°.