CN203414766U

CN203414766U - FPGA (field programmable gate array) based full polarization imaging processing system

Info

Publication number: CN203414766U
Application number: CN201320506333.2U
Authority: CN
Inventors: 骆常见; 沈洁; 王慧斌; 徐淑芳; 陈哲
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2013-08-19
Filing date: 2013-08-19
Publication date: 2014-01-29
Anticipated expiration: 2023-08-19

Abstract

The utility model discloses an FPGA (field programmable gate array) based full polarization imaging processing system, which is characterized in that a full polarization information acquisition part is composed of a circular polarization camera and three linear polarization cameras; a full polarization information control and processing part is a core of the device and designed mainly based on an FPGA, and comprises a power supply, an SRAM 1, an SRAM 2, a FLASH configuration chip, an FPGA chip, a D/A converter, a serial interface and an LED (light-emitting diode); the output ends of the circular polarization camera and the three linear polarization cameras are connected with the FPGA chip through an I2C bus; the output end of the FPGA chip is connected with the LED and the D/A converter; the D/A converter is connected with an upper computer through the serial interface and a cable; the FPGA chip is further connected with the SRAM 1, the SRAM 2 and the FLASH configuration chip; and the power supply provides power for the full polarization information control and processing part. According to the FPGA based full polarization imaging processing system, underwater target full polarization information acquired by the four cameras is more conducive to recognition and detection of an underwater target than ordinary light intensity information and linear polarization information.

Description

Full polarization imaging disposal system based on FPGA

Technical field

The utility model relates to acquisition technology field, is specifically related to a kind of full polarization information acquisition processing system in underwater environment that is applied to.

Background technology

Under water in environment because water body is larger to the absorption of light and scattering process, luminous energy decays rapidly in water, makes Underwater Imaging present atomizing effect, contrast is poor.Polarized imaging system gathers the polarization information of target and background, because background is comparatively mixed and disorderly, cause background reflectance polarisation of light degree all lower, and the catoptrical degree of polarization of target is more much larger than background reflectance polarisation of light degree, therefore utilize target and background reflectance polarisation of light information difference can distinguish preferably target and background, therefore, based on polarization imaging equipment, polarization information collection under water will be had to wide application prospect in following undersea detection.

According to latest research achievement, circularly polarized light by water particle scattering after, circular polarization state will change, and circularly polarized light circular polarization state after target reflection changes less, therefore be different for linear polarization from the land polarization information acquisition system overwhelming majority, collection is more conducive to extract target information and target is surveyed to circular polarization of light component to realize under water when polarization information is gathered increase.Based on above description, a kind of full polarization information acquisition processing device under water arises at the historic moment.

Utility model content

Utility model object: for problems of the prior art and deficiency, the utility model provides the disposal system of the full polarization imaging based on FPGA, the full polarization information that can obtain immersed body by integrated harvester and the computing method of design liner polarization and circular polarization information.

Technical scheme: a kind of full polarization imaging disposal system based on FPGA, full polarization information collecting part is comprised of a circular polarization camera and three linear polarization cameras.It is the core of this device that full polarization information is controlled with processing section, mainly, based on FPGA design, comprise power supply, SRAM1(the first static RAM), SRAM2(the second static RAM), FLASH configuring chip, fpga chip, D/A digital to analog converter, serial line interface and a LED.The output terminal of a described circular polarization camera and three linear polarization cameras passes through I ²c bus is connected with fpga chip; The output terminal of described fpga chip connects respectively LED and D/A digital to analog converter; Described D/A digital to analog converter is connected host computer by serial line interface with cable; Described fpga chip also connects respectively SRAM1, SRAM2 and FLASH configuring chip; Described power supply is for controlling to full polarization information and processing section power supply.

Four cameras are at I ²synchronous acquisition target image under the control of C bus and trigger pulse, completes full polarization information collection.FPGA reads the parameter calculation that four width polarization image data in SRAM1 are carried out polarization image, by the image of circular polarization camera and three linear polarization collected by cameras, can calculate total light intensity, linear polarization component and the circular component of target, thereby complete polarization parameter, calculate.LED is used for indicating SRAM2 storage and output state.System outputs to D/A digital to analog converter by VGA output control module by data in SRAM2, then by serial line interface and cable, is connected to and on host computer, is shown image.

Beneficial effect: compared with prior art, full polarization imaging disposal system based on FPGA provided by the utility model, adopt four integrated polarization cameras of liner polarization and circular polarization, the full polarization information of synchronous acquisition target, rely on FPGA to realize the configuration to system each several part, and realize successively the output function of polarization image collection control, the storage of polarization parameter image and polarization parameter image.The recognition detection that the intensity signal that the full polarization information of submarine target of system acquisition is more common and linear polarization information are more conducive to submarine target.

Accompanying drawing explanation

Fig. 1 is the system construction drawing of the utility model embodiment;

Fig. 2 is fpga chip built-in function structural drawing of the present utility model;

Fig. 3 is the peripheral connection layout of the fpga chip of the utility model embodiment.

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model.

As shown in Figure 1, the full polarization imaging disposal system based on FPGA, mainly comprises full polarization information collecting part and full polarization information control and processing section.Full polarization information collecting part comprises a circular polarization camera, three linear polarization cameras.Full polarization information is controlled with processing section and is comprised power supply, SRAM1, SRAM2, FLASH configuring chip, fpga chip, LED, D/A digital to analog converter and serial line interface.

The output terminal of a circular polarization camera and three linear polarization cameras passes through I ²c bus is connected with fpga chip; The output terminal of fpga chip connects respectively LED and D/A digital to analog converter; D/A digital to analog converter is connected host computer by serial line interface with cable; Fpga chip also connects respectively SRAM1, SRAM2 and FLASH configuring chip; Power supply is for controlling to full polarization information and processing section power supply.

Three linear polarization cameras are respectively 0 degree polarization camera, 60 degree polarization cameras and 120 degree polarization cameras.

As shown in Figure 2, fpga chip functional module comprises information acquisition control module, polarization parameter computing module, polarization image read-write control module, polarization parameter read-write control module, VGA output control module.Describe the function of each module below in detail:

Information acquisition control module completes the control to full polarization information collecting part, and FPGA exposes by four cmos sensors of trigger pulse triggers simultaneously, I ²c bus gathers clock and configuration data to full polarization information collecting part input picture, and cmos sensor is according to field signal, row signal, pixel clock and the view data of exposure signal and image acquisition clock generating image.

Polarization image read-write control module completes storage and the read functions of view data in SRAM1, FPGA stores view data in SRAM1 into according to the field signal of image, row signal and pixel clock, after the storage sequential of view data finishes, polarization parameter computing module is the sequential that reads of carries out image data, for resolving of polarization parameter image.

Polarization parameter computing module completes resolving of polarization parameter, according to RANS, calculates I, Q, U, V, Dop ₁, Dop ₂, θ.

Polarization parameter read-write control module completes storage and the read functions of polarization parameter in SRAM2, the result that polarization parameter computing module resolves deposits in SRAM2, after SRAM2 is filled with, the output control bit OE of SRAM2 is set to significance bit, OE signal triggers FPGA output useful signal to LED, and LED brightens and represents that data are filled with output.

VGA output control module completes the output function of polarization parameter image, and the monitoring position in FPGA starts the output process of FPGA, under the output timing of VGA is controlled, exports successively the polarization parameter image in SRAM2.

As shown in Figure 3, cmos sensor model is MT9V139, fpga chip model is EP2C5T144, LED model is 10000MCD, SRAM model is 61LV25616, configuring chip model is EP1CS1, D/A chip model is THS8134A, battery size is the lithium battery of 18650 types, battery is powered to whole system, configuring chip receives after the clock signal DCLK of system, to FPGA download configuration program DATA, cmos sensor is under the control of exposure signal SDATA and system clock CLKIN, produce view data Data[0..9], field signal FRAME, row signal LINE, pixel clock signal PIXCLK, SRAM is according to the CE of FPGA input, OE, WE, UB, LB signal and corresponding address signal A[0..17], export 16 bit image data Data[0..15], D/A chip is under the control of clock signal clk, output rgb signal GY[0..7], RPr[0..7], BPb[0..7].

Implementation method under water of the present utility model is specific as follows:

Press system power supply switch, then, by being sealed in full polarization information harvester in bucker and being placed on the waters of illumination abundance, camera lens is partly aimed to selected target, gather the full polarization information of target.

The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvement, these improvement also should be considered as protection domain of the present utility model.

Claims

1. the full polarization imaging disposal system based on FPGA, is characterized in that: full polarization information collecting part is comprised of a circular polarization camera and three linear polarization cameras; It is the core of this device that full polarization information is controlled with processing section, mainly, based on FPGA design, comprises power supply, SRAM1, SRAM2, FLASH configuring chip, fpga chip, D/A digital to analog converter, serial line interface and a LED; The output terminal of a described circular polarization camera and three linear polarization cameras passes through I ²c bus is connected with fpga chip; The output terminal of described fpga chip connects respectively LED and D/A digital to analog converter; Described D/A digital to analog converter is connected host computer by serial line interface with cable; Described fpga chip also connects respectively SRAM1, SRAM2 and FLASH configuring chip; Described power supply is for controlling to full polarization information and processing section power supply.