35results about How to "No vignetting" patented technology

The invention discloses a seamlessly spliced photoelectronic imaging system with double lens using 25 area-array detectors. The photoelectronic imaging system is characterized in that a structure of two imaging systems and a prism beam splitting way are adopted; on a first lens, imaging of 17 area-array detectors is realized, wherein 9 area-array detectors are disposed on a main image surface, and 8 area-array detectors are disposed on four lateral image surfaces, specifically, 2 area-array detectors are disposed on each of the four lateral image surfaces respectively; on a second lens, imaging of 8 area-array detectors is realized, wherein 4 area-array detectors are disposed on a main image surface, and 4 area-array detectors are disposed on four lateral image surfaces, specifically, 1 area-array detector is disposed on each of the four lateral image surfaces respectively; the two imaging systems and the area-array detectors are combined to realize seamless splicing of the image surfaces which are formed by 25 area-array detectors in a 5*5 mode; a beam splitting prism is realized through combination of one rectangular pyramid mirror and four semi-rectangular pyramid mirrors; beam splitting on a beam splitting surface is realized by adopting half-transmission and half-reflection, so that equal-energy beam splitting is realized, and splicing vignetting of the area-array detectors is eliminated. The system disclosed by the invention can be applied to aeronautic and astronautic optical imaging and optical detection instruments and equipment, and is particularly suitable for aeronautic and astronautic surveying and mapping cameras with large fields of view and using ultra-large area-array detectors.

From an object side to an imaging surface along an optical axis, the lens comprises: a first lens with negative focal power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens, wherein the object side surface is a concave surface, and the image side surface is a convex surface; a diaphragm; a third lens, wherein the object side surface and the image side surface are convex surfaces; a fourth lens, wherein the object side surface and the image side surface are concave surfaces; a fifth lens, whichhas positive focal power, wherein the object side surface and the image side surface are convex surfaces; a sixth lens, which has negative focal power, wherein the object side surface is a convex surface near the optical axis, and the image side surface is a concave surface near the optical axis. The infrared confocal wide-angle lens meets the conditional expressions that FOV is larger than or equal to 160 degrees and smaller than or equal to 180 degrees, and f / TTL is larger than 0.2 and smaller than 0.3, wherein FOV represents the maximum field angle of the infrared confocal wide-angle lens, f represents the effective focal length of the infrared confocal wide-angle lens, and TTL represents the distance from the object side face of the first lens to the imaging face on the optical axis.

The invention discloses a lens shadow correction method for imaging a camera into a circular picture, which specifically comprises the following steps of: dividing an imaging circle into a central circle and fan-shaped regions surrounding the central circle, correcting the color and the brightness of each fan-shaped region by taking the color and the brightness of the central circle as references, and enabling the color correction gain to be the color of the central circle / the color of the fan-shaped regions, the brightness correction gain is the brightness of the center circle / the brightness of the fan-shaped region. According to the method, the shadow compensation area is divided for the circular imaging picture by adopting a mode of adding the central circle and the sector area, and color compensation and brightness compensation are adopted for the shadow area, so that the color and the brightness of the circular picture are uniform, no dark corner exists around the image, and the image effect is improved.