Incoherent light correlator of inverted image projection relation
An incoherent light and correlator technology, applied in optics, instruments, optical components, etc., can solve the problems of adjusting the position of the image plane, difficult disassembly and assembly, offset, etc., to save costs, avoid difficult disassembly and assembly, and reduce the occupation. effect of space
Inactive Publication Date: 2010-12-15
SHANGHAI UNIV OF ENG SCI
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The backlight source 1 is the most bulky device in the optical path of the correlator, and it is not easy to disassemble and assemble. The vibration and collision during the installation process may cause the position of the installed device to shift. In addition, if the input image and the reference image are similar in size, The position of the object plane will be far away from the lens, and it is difficult to find such a long optical platform to place both the correlator and the object on the object plane; the object plane in Figure 3(b) is outside the reference image, which is a virtual The object plane is only the conjugate plane of the image plane, it does not actually exist, and it is impossible to adjust the position of the image plane by using the imaging of the object on the object plane
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[0016] According to attached figure 1 The incoherent optical correlator shown in the inverse projection relationship has an input image 2, an object plane 3, a reference image 4, an imaging lens 5, and an image plane in sequence along the direction of propagation of the diffuse reflection plane wave emitted by the diffuse scattering backlight 1. 6; The object plane 3 is located at the intersection of the diagonal lines between the input image plane 2 and the reference image plane 4 .
[0017] The input image plane 2 is close to the back of the diffuse scattering backlight plane 1; the side length a of the input image 2 is equal to the side length A of the backlight 1; the input image 2 is inverted, thereby ensuring that it is in the reference image The projection of the plane is an orthographic image.
[0018] The object plane 3 is located at the intersection of the two diagonal lines between the input image plane 2 and the reference image plane 4; the side length c of the ef...
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An incoherent light correlator with inverted image projection relationship is characterized in that an input image, an object plane, a reference image, an imaging lens and an image plane are sequentially arranged along the propagation direction of a diffuse reflection plane wave emitted from a diffuse reflection backlight source; the input image is inverted and is projected on a reference image plane in an inverted manner according to the pinhole imaging principle; the object plane is positioned at the intersection point of two diagonal lines of an input image plane and the reference image plane between the input image plane and the reference image plane and is a real object plane not shielded by a backlight source; and the imaging type of the object image is independent from the input image and the scale of the input image. Accordingly, the position of the image plane can be conveniently adjusted by arranging an object at the real determined position. The invention has the advantagesof simple structure, easy installation and debugging and wide application prospect in optical information processing field.
Description
technical field [0001] The invention relates to an optical projection correlator, in particular to an incoherent optical correlator for optical information processing. technical background [0002] The incoherent optical correlator is another optical correlation scheme different from the matched filtering and joint transformation correlation of the 4f system. The incoherent optical correlator uses the diffuse scattering characteristics of incoherent light to perform lens transformation on all aspects of the translation image. Superimposition, to directly obtain the correlation result of two images, has broad application prospects in optical information processing. However, in practical applications, due to errors in the installation process, the position of the device needs to be adjusted, and the positions of the two main surfaces of the lens are difficult to determine by measurement, especially the position of the image plane is the most difficult to determine. The best wa...
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IPC IPC(8): G02B27/42G02B27/46G06E3/00
Inventor 陈戍
Owner SHANGHAI UNIV OF ENG SCI