WO2015163831A1 - A programmable logic circuit for night sight systems - Google Patents
A programmable logic circuit for night sight systems Download PDFInfo
- Publication number
- WO2015163831A1 WO2015163831A1 PCT/TR2014/000125 TR2014000125W WO2015163831A1 WO 2015163831 A1 WO2015163831 A1 WO 2015163831A1 TR 2014000125 W TR2014000125 W TR 2014000125W WO 2015163831 A1 WO2015163831 A1 WO 2015163831A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- programmable logic
- logic circuit
- block
- image
- distribution
- Prior art date
Links
- 230000006870 function Effects 0.000 claims description 23
- 238000009826 distribution Methods 0.000 claims description 22
- 238000012546 transfer Methods 0.000 claims description 18
- 238000013461 design Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000012886 linear function Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/40—Image enhancement or restoration using histogram techniques
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/90—Dynamic range modification of images or parts thereof
- G06T5/92—Dynamic range modification of images or parts thereof based on global image properties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
- H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2200/00—Indexing scheme for image data processing or generation, in general
- G06T2200/28—Indexing scheme for image data processing or generation, in general involving image processing hardware
Definitions
- the present invention relates to a programmable logic circuit, which is developed for day and night sight systems (thermal camera, day tv camera, etc.), is designed using hardware description language, can be implemented, and is capable of making the details on an image visible without requiring any other intelligent device.
- the Chinese patent document no. CN102158653 discloses a device and method for acquiring a data with high dynamic range in real time.
- the said invention functions with an embedded image processing system.
- the device comprises an FPGA logic device, a CCD (Charge Coupled Device) imaging array, a video dedicated A/D chip, a coprocessor DSP (Digital Signal Processor) and a SRAM (static random access memory).
- the image with high dynamic range is generated in real time.
- the quality of the image shot by the CCD is improved.
- the Japanese patent document no. JPH10210424 discloses a conversion device which can control image quality and can convert the video signal into the desired clock frequency.
- the sharpness degree of an image edge is controlled by processing the data that is inputted to the FPGA from a personal computer.
- using both a programmable logic circuit and a processor makes the design structure complex and requires designing a communication mechanism for the two units. Using different processors on different projects leads to making the same design again, and causes increase of design, verification and documentation periods and loss of inefficiency.
- the objective of the present invention is to provide a programmable logic circuit, which is developed for day and night sight systems (thermal camera, day tv camera, etc.), is designed using hardware description language, can be implemented, and is capable of making the details on an image visible without requiring any other intelligent device.
- a programmable logic circuit developed to fulfill the objective of the present invention is illustrated in the accompanying figure wherein:
- Figure 1 is the schematic view of the programmable logic circuit.
- a programmable logic circuit which is developed for day and night sight systems, is designed using hardware description language, can be implemented, and is capable of making the details on an image visible without requiring any other intelligent device; basically comprises
- At least one filter block (2) which is adapted to find the low frequency and high frequency image contents of the unprocessed input video
- At least one statistics block (3) which is adapted to find histogram (distribution) of the low frequency image content
- At least one histogram ram (4) which is adapted to store the histogram of the low frequency image content
- At least one coefficient finder block (5) which is adapted to compute the transfer function that is used to increase the output video contrast with respect to the intended distribution
- at least one coefficient ram (6) which is adapted to store the coefficients
- at least one transfer function block (7) which is adapted to generate the enhanced video according to the transfer function and to add high frequency components to the video
- the programmable logic circuit (1) comprises a filter block (2) which is adapted to find the low frequency and high frequency image contents of the unprocessed input video, a statistics block (3) which is adapted to find histogram (distribution) of the low frequency image content, and a histogram ram (4) which is adapted to store the histogram of the low frequency image content.
- the programmable logic circuit (1) further comprises a coefficient finder block (5) which is adapted to compute the transfer function that is used to increase the output video contrast with respect to the intended distribution, a coefficient ram (6) which is adapted to store the coefficients, a transfer function block (7) which is adapted to generate the enhanced video according to the transfer function and to add high frequency components to the video, and an interface block (8) which is adapted to allow connection to the serial interface.
- a coefficient finder block (5) which is adapted to compute the transfer function that is used to increase the output video contrast with respect to the intended distribution
- a coefficient ram (6) which is adapted to store the coefficients
- a transfer function block (7) which is adapted to generate the enhanced video according to the transfer function and to add high frequency components to the video
- an interface block (8) which is adapted to allow connection to the serial interface.
- the programmable logic circuit (1) "IP” produces output data according to "Rayleigh” distribution with default values. If a different output data distribution is desired, the intended distribution values can be written into the distribution logs in the statistics block (3) via the interface block (8) and video output can be provided in this distribution.
- mathematical formulation of the function implemented by the programmable logic circuit (1 ) of the present invention is as follows: histogram value of an unprocessed image (ranging from 0 to L) can be represented with the function hist_input(i); total pixel number on the image can be computed by hist _ input(i) cumulative histogram value, normalized to "1" for any value, represented as cum_hist_input(n) is computed by hist _ input(i) ⁇ hist _ input(i)
- hist_input(i) values are calculated by the statistics block (3) provided on the programmable logic circuit (1) of the present invention, and are stored in the coefficient ram (6) for values 0 to L and by adding up the number of image data used in this calculation, the total histogram value, cum_hist_input(L) value is computed.
- the coefficient finder block (5) which is located on the programmable logic circuit (1), computes the cum_hist_input(i) value corresponding to the cum_hist_out(i) value for each value from 0 to 255 (256 values) in order to equalize the cum_hist_out(i) value and cum_hist_out(i) value and thus the transfer function block (7) calculates T(i).
- the coefficient finder block (5) stores these values in the coefficient ram.
- the transfer function block (7) located on the programmable logic circuit (1) generates the enhanced image data according to the transfer function for each value of the unprocessed image data.
- thermal cameras usually have 8 bit video output, as this color depth represents the value human eye can recognize.
- 8 bit video output 256 point piecewise transfer function is used and this way the most real-like distribution is attained for 8 bits at the video output.
- Using a 256 point piecewise function causes to use more logic gates, however an output distribution which is closest to the desired distribution is achieved.
- the image is divided into its low frequency and high frequency components by the two dimensional filter block (2), the edge information in the high frequency components is reinforced and is added to the processed (enhanced) image; so sharper images are achieved.
- the programmable logic circuit (1) in another embodiment, thanks to the programmable logic circuit (1), a synchronous design is implemented. So the delay values between the logic circuits can be controlled and the design can be implemented on different vendor programmable logic circuits. Furthermore, the video data transmitted by the video synchronization signals can be processed and it can work with any video format since the only requirement is 8192 clock cycles gap time between two consecutive frames. In another embodiment of the invention, the programmable logic circuit (1) of the present invention generates an output video in the same format with the format of the input video; and as 256 point piecewise linear function is used for transfer function, best output image distribution is achieved. Furthermore, video output with different distributions can be allowed by the interface block (8).
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Logic Circuits (AREA)
- Image Processing (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/TR2014/000125 WO2015163831A1 (en) | 2014-04-21 | 2014-04-21 | A programmable logic circuit for night sight systems |
TN2016000467A TN2016000467A1 (en) | 2014-04-21 | 2014-04-21 | A programmable logic circuit for night sight systems. |
UAA201504866U UA130283U (en) | 2014-04-21 | 2014-04-21 | A programmable logic circuit for night sight systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/TR2014/000125 WO2015163831A1 (en) | 2014-04-21 | 2014-04-21 | A programmable logic circuit for night sight systems |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015163831A1 true WO2015163831A1 (en) | 2015-10-29 |
Family
ID=50933470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/TR2014/000125 WO2015163831A1 (en) | 2014-04-21 | 2014-04-21 | A programmable logic circuit for night sight systems |
Country Status (3)
Country | Link |
---|---|
TN (1) | TN2016000467A1 (en) |
UA (1) | UA130283U (en) |
WO (1) | WO2015163831A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108040111A (en) * | 2017-12-13 | 2018-05-15 | 北京北信源软件股份有限公司 | A kind of apparatus and method for supporting natural language interaction |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10210424A (en) | 1997-01-20 | 1998-08-07 | Sony Corp | Rate conversion device and image-pickup device |
WO2004054238A1 (en) * | 2002-12-06 | 2004-06-24 | Koninklijke Philips Electronics N.V. | Gamma correction |
CN102158653A (en) | 2011-05-03 | 2011-08-17 | 东华大学 | Device and method for acquiring digital image with high dynamic range in real time |
US20130125184A1 (en) | 2006-04-24 | 2013-05-16 | Geno Valente | System and Methods for the Simultaneous Display of Multiple Video Signals in High Definition Format |
CN103177429A (en) * | 2013-04-16 | 2013-06-26 | 南京理工大学 | FPGA (field programmable gate array)-based infrared image detail enhancing system and method |
US8515196B1 (en) * | 2009-07-31 | 2013-08-20 | Flir Systems, Inc. | Systems and methods for processing infrared images |
-
2014
- 2014-04-21 TN TN2016000467A patent/TN2016000467A1/en unknown
- 2014-04-21 UA UAA201504866U patent/UA130283U/en unknown
- 2014-04-21 WO PCT/TR2014/000125 patent/WO2015163831A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10210424A (en) | 1997-01-20 | 1998-08-07 | Sony Corp | Rate conversion device and image-pickup device |
WO2004054238A1 (en) * | 2002-12-06 | 2004-06-24 | Koninklijke Philips Electronics N.V. | Gamma correction |
US20130125184A1 (en) | 2006-04-24 | 2013-05-16 | Geno Valente | System and Methods for the Simultaneous Display of Multiple Video Signals in High Definition Format |
US8515196B1 (en) * | 2009-07-31 | 2013-08-20 | Flir Systems, Inc. | Systems and methods for processing infrared images |
CN102158653A (en) | 2011-05-03 | 2011-08-17 | 东华大学 | Device and method for acquiring digital image with high dynamic range in real time |
CN103177429A (en) * | 2013-04-16 | 2013-06-26 | 南京理工大学 | FPGA (field programmable gate array)-based infrared image detail enhancing system and method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108040111A (en) * | 2017-12-13 | 2018-05-15 | 北京北信源软件股份有限公司 | A kind of apparatus and method for supporting natural language interaction |
Also Published As
Publication number | Publication date |
---|---|
UA130283U (en) | 2018-12-10 |
TN2016000467A1 (en) | 2018-04-04 |
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