WO2017001878A1

WO2017001878A1 - High definition multispectral-multi-chanel imaging camera system

Info

Publication number: WO2017001878A1
Application number: PCT/IB2015/001099
Authority: WO
Inventors: Fulvio Jacocagni; Jacopo DELLA ROSA
Original assignee: Fulvio Jacocagni
Priority date: 2015-07-02
Filing date: 2015-07-02
Publication date: 2017-01-05

Abstract

This invention is an optical system based on X dichroic mirrors to divide the light spectrum coming from optic input of the camera to X + I light bands. The light of each band is received from a specific image sensor. The invention is to replace the existing system based on prisms correcting defects.

Description

"HIGH DEFINITION MULTISPECTRAL-MULTTCl lANEL IMAGING CAMERA SYSTEM'

Applicant: Jacocagni F lvi , Ilvlibuchweg 259, AG 5462 Siglisdorf,

Switzerland

Inventors; Jacocagni Fulvio, Holibuckweg 259, AG - 5462 Siglisdorf,

Switzerland

Jacopo Delia Rosa, Sudstrasse 54, ZH - 8157 Dielsdorf Switzerland Description

Area of application

't he present invention relates to an optical system for capture multiband- multispectral photos and video (Ultraviolet - Visible - InfraTCed).

Background art

The current systems in the multichannel photo-video camera use a set of prisms, called Philips prism (FIG. 1 ). The set of multiple prisms allovvs to divide the light into three or more bands (FTG. 1 N. 1 ,2,3).

The current system, has some construction faults (white shading, shading to the colour of off-focus images, variations caused by polarization, the lens flares problem). In particular in the total reflection points (FIG. 1 N. 4) there is the problem of polarization,

Introduction on invention

This invention consists in an optical system alternative to the use of the prism tliat allows to overcome the abovementioned technical errors. Brief description of drawings

Additional features and benefits of the invention will become more apparent throngli thc detailed description of one type but not exclusive implementation of a system, illustrated for ηυη-linrilrng example with the help of the drawing tables in which:

The FIG. 1 is a view of the current optical system based on prisms;

1 . Image sensor of the red band

2. Image sensor of the blue band

3. Image sensor of the green band

4. Point of total reflection

5. Optical input of the camera

The FIG. 2 is a view of the system, object of a patent, using dichroic mirrors in place of the prism system;

1. Dichroic mirror reflecting the band of red

2. Dichroic mirror reflecting the band of blue

3. Image sensor of the red band

4. Image sensor of the green band

5. Image sensor o f the blu e band

6. Optical input of the camera Detailed description

The system deletes the abovementioned technical errors using a series of dichroic mirrors not polarizing. The dichroic mirror is a particular filter which, treated with an appropriate set of thin films of transparent material, reflects a range of wavelengths and passes the remaining. Typical example is the use of two metal oxides Ti0₂-Si0₂. The innovation is the substitution of the prism Philips and other solutions formed by a greater number of prisms, through the use of Hal dichroic mirrors not polarizing.

The system consists of a series of X dichroic mirrors located exactly on the optical axis of the system of the camera, Each mirror is specialized in the reflection of a range of wavelengths and the transmission of the remaining. Each mirror has a specific location and an inclination which allows to deflect the range of light reflected toward an image sensor HD (High Definition) that converts the light received into an electrical signal (ex. CCD sensor or CMOS high-definition).

The mirrors are fixed to a mechanical clement which acts as an optical table. The distances and angles arc calculated for each specific system so that incoming light is focused on the active surface of each sensor. The sensors arc aligned with each other and form the image coming from optical input of the camera. The system then is intended to generate an image with more information than the traditional method with a single CCD. Also the mirrors are adequately treated in order to avoid the problem of polarization of the light that happens in the system composed by the prisms.

According to the purpose of application, the images obtained are individually recorded because they arc useful to the next analysis of particular intervals. The number of mirrors and the required interval is variable because it dq^ends upon the specific purpose of the user. For example, in the context of precision agriculture, they arc required of the camera that records simultaneously and separately, from a minimum of 3 bands (red, green and near infrared), 2 mirrors, to 8 bands, 7 mirrors, different. In this context the different acquired images for each band show the user a different state vegetation and soil.

The optical system (FIG. 2) has two mirrors (FIG 2 N. 1 ,2). This system is usually said RGB because the light, which comes from the optical system of inpt (FIG 2 N. 6), is divided into three basic components: red, green and blue. The first mirror (FIG 2 N. 1 ) is calculated to reflect light in the range of red (620-750 lira) and pass the remaining wavelengths. The mirror is inclined at an suitable angle and reflects Hie red light that will be recorded from a particular sensor CCD / CMOS high definition (FIG 2 N. 3). The wavelengths of the remaining light will impact on the second dichroic mirror (PIC 2 No 2) which is calculated to reflect the wavelengths relative to blue light (450-475 tvm). Also the second mirror is inclined to deflect the blue light on the specific sensor CCD / CMOS (KlG 2 N. 5). The remaining light will impact on the third sensor CCD / CMOS (FTG 2 N. 4), which in tins case will be the green light (495-570 nm),

Possible uses of this invention are: in precision agriculture, archeology, industrial control, military applications for surveillance, in medicine, scienti lic analysis and in 95 all other fields that require a specific multichannel-camera.

Also this system is ideal for the use of the camera on small systems unmanned aerial vehicle (UAV - drones) because the use of dichroic mi rors, in place of the set of prisms, makes a sig ificant saving of weights.

From what described it is clear that the instrument according to the invention readies

1 0 the intended purposes.

The invention is subject to many changes and variants, that fall within inventive idea stated in the enclosed claims. All the details may be replaced with other technically equivalent elements, and the materials may vary according to the needs, without departing from the scope of this invention,

105 Even if the object has been described with particular reference to the attached figures, the reference numbers are used in the pictures and in the claims to improve the intelligence of the invention and do not constitute any limitation of the claimed scope.

Claims

110 Claims

CLAIM 1 . An optical system for photo-video capture, or other equipment thai use the system of division of light, that:

- Mukes use of optical filters to divide the light into bands (FIG. 2 N. 1 ,2);

- Makes use of devices to capture images of single bands (FIG. 2 N. 3,4,5);

1 15 - Makes use of types of lixings to keep the placement of the previous filters and devices

characterised in that

2. system as claimed in claim 1 , characterized in that said the number of the filters may vary from n. 1 to X according to the number of ranges of wavelengths that is to

120 be recorded.

3. system as claimed in claim 1, characterized in that said the filters used are specialized to reflect efficiently wavelengths of excitement and let through wavelengths of emission .

4. system as claimed in claim 1 , characterized in that said the filters are located 25 following a specific angle and position calculated in according to each specific device.

5. system as claimed in claim 1 , characterized in that said the fi lter structure is made so that the polarizing effect can be avoided.

6. system as clainied in claim 1 , characterized in that said the devices that capture30 the images are located following a specific angle and position calculated in according to each specific equipment.

7. system as claimed in claim 1 , characterized in that said the (liters are fixed to a mechanical element. 35