Leader SFR-Fit MTF Measurement Software

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Description

SFR-Fit is software for measuring the MTF (Modulation Transfer Function), which indicates the spatial frequency characteristics of a camera. MTF expresses how faithfully the contrast of the subject being imaged can be reproduced, and is the most important measurement item in evaluating camera performance. Until now, the most commonly used methods for measuring MTF were the slanted edge method based on ISO12233 and the sine wave contrast method using a Siemens star chart. SFR-Fit is a completely new MTF measurement method that uses a unique algorithm to handle images with large distortions, which have been difficult to measure in the past, and image processing such as sharpness and compression. It is ideal for evaluating cameras used in fields such as automobiles, surveillance, and medicine.

Features

  • Resistant to noise and image processingOne problem with the slanted edge method, which is generally used to measure MTF, is that the measured values in the high-frequency region are unstable when there is significant image noise. Also, when image processing such as sharpness and compression is applied, the linearity of the MTF calculation, which is the basis of the slanted edge method, is not satisfied, and the validity of the measured value may be lost. SFR-Fit adopts the sinusoidal contrast method and measures the contrast by the least-squares method. With this method, even if the captured image contains noise or harmonic components due to image processing, the fundamental component can be extracted and measured producing stable results that are not affected by noise or image processing.

  • Compatible with fisheye and ultra-wide-angle camerasThe sine wave contrast method was generally measured using a Siemens star chart, but this measurement method was not compatible with images with large distortions such as those obtained with an ultra-wide-angle camera using a fisheye lens. SFR-Fit solves the problem of the sine wave contrast method using the Siemens star chart by analyzing the distortion of the image and then measuring the MTF on the undistorted test pattern. This function enables MTF measurement that is resistant to noise and image processing and also accommodates distortion. In addition, since the process from image distortion analysis to measurement is automatically executed, it contributes to labor saving in inspection work.

  • Free placement of test chartsSFR-Fit uses a display as a test chart to measure the MTF with a test pattern aligned with the camera and test chart positions. The optimum test pattern is generated on a display placed in the desired test location, and accurate MTF is then measured. This allows for simple measurement of the periphery of an ultra-wide-angle camera. *1*1*1 Exact placement has conditions. For details, please refer to the instruction manual.

  • Can measure localized MTF in a region of interest (ROI)Since the test pattern is switched for each spatial frequency, the measurement area (ROI) is miniaturized and partial MTF can be measured. For example, you can arbitrarily set the measurement points such as the center of the image and the image height of 40% or 80%. The measurement area can be easily set by clicking and dragging with a mouse or entering numerical values.

  • Simple system configurationThe equipment required for measurement is only a PC with SFR-Fit installed and a display used as a test chart. After connecting the camera to be inspected and completing the software settings, simply press the start button and the MTF measurement results will be displayed. MTF plot data and MTF values will be saved as a CSV format file. It is also possible to save images and test patterns during measurement.

function

  • Display channel selection functionMeasurement results can be displayed for each luminance and R.G.B channel. It is possible to display all components at the same time as well as independent display for each component.

  • Graph unit selection functionThere are three selectable result units: line pair per millimeter (LP/mm), cycle per pixel (cycle/pixel), and line width per picture height (LW/PH). Line Pairs Per Millimeter indicates the number of black and white line pairs displayed per millimeter. Cycles per pixel is the unit of spatial frequency normalized by the pixel pitch of the image sensor, indicating the number of cycles of the pattern displayed per pixel. For example, if a sine wave pattern is drawn with 10 horizontal pixels, there is 0.1 cycle per pixel, so 0.1 cycle per pixel. Since at least 2 pixels are required to represent one cycle, the highest frequency is 0.5 cycles per pixel. Per Picture Height indicates the number of scans per image height.

  • Selectable Data PointsYou can display the measured values in the graph of the measurement results. Just click anywhere on the graph to display the measured value, so you can easily read the MTF value. In addition, since it is possible to display multiple points at the same time, the measurement value of each point can be checked instantaneously.

  • Bar chart sampling waveform displayIt is possible to display sampling waveforms for each spatial frequency, brightness, and R.G.B channel of the generated bar chart. The horizontal axis of the graph is the sampling point (resolution varies with spatial frequency). The vertical axis is the luminance level after linearization. The sampling waveform display of SFR-Fit corresponds to the edge profile of the slanted edge method, and can be used, for example, to check the influence of image processing, the occurrence of aliasing, and the saturation of luminance.

Introduction Video

Introducing the SFR-Fit(YouTube)

CES2023 Leader Electronics Corporation Exhibit Report

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Description
Content

SFR-Fit is software for measuring the MTF (Modulation Transfer Function), which indicates the spatial frequency characteristics of a camera. MTF expresses how faithfully the contrast of the subject being imaged can be reproduced, and is the most important measurement item in evaluating camera performance. Until now, the most commonly used methods for measuring MTF were the slanted edge method based on ISO12233 and the sine wave contrast method using a Siemens star chart. SFR-Fit is a completely new MTF measurement method that uses a unique algorithm to handle images with large distortions, which have been difficult to measure in the past, and image processing such as sharpness and compression. It is ideal for evaluating cameras used in fields such as automobiles, surveillance, and medicine.

Features

  • Resistant to noise and image processingOne problem with the slanted edge method, which is generally used to measure MTF, is that the measured values in the high-frequency region are unstable when there is significant image noise. Also, when image processing such as sharpness and compression is applied, the linearity of the MTF calculation, which is the basis of the slanted edge method, is not satisfied, and the validity of the measured value may be lost. SFR-Fit adopts the sinusoidal contrast method and measures the contrast by the least-squares method. With this method, even if the captured image contains noise or harmonic components due to image processing, the fundamental component can be extracted and measured producing stable results that are not affected by noise or image processing.

  • Compatible with fisheye and ultra-wide-angle camerasThe sine wave contrast method was generally measured using a Siemens star chart, but this measurement method was not compatible with images with large distortions such as those obtained with an ultra-wide-angle camera using a fisheye lens. SFR-Fit solves the problem of the sine wave contrast method using the Siemens star chart by analyzing the distortion of the image and then measuring the MTF on the undistorted test pattern. This function enables MTF measurement that is resistant to noise and image processing and also accommodates distortion. In addition, since the process from image distortion analysis to measurement is automatically executed, it contributes to labor saving in inspection work.

  • Free placement of test chartsSFR-Fit uses a display as a test chart to measure the MTF with a test pattern aligned with the camera and test chart positions. The optimum test pattern is generated on a display placed in the desired test location, and accurate MTF is then measured. This allows for simple measurement of the periphery of an ultra-wide-angle camera. *1*1*1 Exact placement has conditions. For details, please refer to the instruction manual.

  • Can measure localized MTF in a region of interest (ROI)Since the test pattern is switched for each spatial frequency, the measurement area (ROI) is miniaturized and partial MTF can be measured. For example, you can arbitrarily set the measurement points such as the center of the image and the image height of 40% or 80%. The measurement area can be easily set by clicking and dragging with a mouse or entering numerical values.

  • Simple system configurationThe equipment required for measurement is only a PC with SFR-Fit installed and a display used as a test chart. After connecting the camera to be inspected and completing the software settings, simply press the start button and the MTF measurement results will be displayed. MTF plot data and MTF values will be saved as a CSV format file. It is also possible to save images and test patterns during measurement.

function

  • Display channel selection functionMeasurement results can be displayed for each luminance and R.G.B channel. It is possible to display all components at the same time as well as independent display for each component.

  • Graph unit selection functionThere are three selectable result units: line pair per millimeter (LP/mm), cycle per pixel (cycle/pixel), and line width per picture height (LW/PH). Line Pairs Per Millimeter indicates the number of black and white line pairs displayed per millimeter. Cycles per pixel is the unit of spatial frequency normalized by the pixel pitch of the image sensor, indicating the number of cycles of the pattern displayed per pixel. For example, if a sine wave pattern is drawn with 10 horizontal pixels, there is 0.1 cycle per pixel, so 0.1 cycle per pixel. Since at least 2 pixels are required to represent one cycle, the highest frequency is 0.5 cycles per pixel. Per Picture Height indicates the number of scans per image height.

  • Selectable Data PointsYou can display the measured values in the graph of the measurement results. Just click anywhere on the graph to display the measured value, so you can easily read the MTF value. In addition, since it is possible to display multiple points at the same time, the measurement value of each point can be checked instantaneously.

  • Bar chart sampling waveform displayIt is possible to display sampling waveforms for each spatial frequency, brightness, and R.G.B channel of the generated bar chart. The horizontal axis of the graph is the sampling point (resolution varies with spatial frequency). The vertical axis is the luminance level after linearization. The sampling waveform display of SFR-Fit corresponds to the edge profile of the slanted edge method, and can be used, for example, to check the influence of image processing, the occurrence of aliasing, and the saturation of luminance.

Introduction Video

Introducing the SFR-Fit(YouTube)

CES2023 Leader Electronics Corporation Exhibit Report

The LT4611 is a 1U full rack size sync generator that can operate in synchronization with GPS, BDS, PTP, CW, and internal reference signals, as well as Genlock that supports external analog video synchronization signals.It supports analog video sync signals, AES / EBU digital audio output, word clock, and time code, and also supports 3G / HD / SD-SDI output and 12G-SDI output compatible with 4K and 8K.In addition, it supports the PTP grand master function and PTP slave function, and can manage the optimum synchronization system according to the system.The genlock function is equipped with a STAY IN SYNC function that retains the phase when an abnormality occurs in the input analog video synchronization signal, and the power supply unit performs redundant operation, enabling highly reliable system construction.LT4611 has slimmed down the standard functions from the standard specifications of the LT4610, the SDI output function, audio output function, and three of the six analog sync signal output systems to be prepared as optional product. Functions can be added as needed, allowing you to configure the system with specifications that meet your objectives.

Features

  • Genlock FunctionVarious output signals can be synchronized by applying NTSC/PAL black burst signals, which are analog video sync signals, and HDTV tri-level sync signals.NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported.
  • Stay-in-Sync and Slow Lock FunctionsA Stay-in-Sync function is available in case errors occur at the genlock input. In addition, a slow lock function is available to reduce the shock that occurs when genlock is performed again based on stay-in-sync. This makes it possible to construct an extremely reliable synchronization system.
  • Analog Video Sync Signal OutputThree analog video sync signals can be output (up to six using an option). The phase of each output can be adjusted independently.NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported.
  • GPS/BDS SynchronizationGNSS antenna can be connected to generate and output signals by locking to the frequency and clock obtained from the GPS or BDS.
  • PTPPTP synchronization corresponds to the grandmaster and slave functions.You can choose reference signal from PTP, GPS, analog BB or internal.
  • Time Code I/OThe ATC (LTC) can be embedded in LTC outputs from internal time, GPS, LTC, and VITC time information, and SDI signal outputs, or VITC in analog video synchronous signal outputs.
  • Triple-rate SDI ReadySDI signal output supports 3G-SDI (level A and level B), HD-SDI (including dual link), and SD-SDI. There are two independent outputs of SDI signal at output terminals. The pattern and phase can be set separately for each. (However, only a single output is available for 3G-SDI level B and HD dual link.)
  • Lip Sync PatternsThis option can output lip sync patterns in which the video and audio are synchronized. In combination with a waveform monitor that features a lip sync function, such as the Leader’s LV5600, it is possible to measure the offset between the video and audio in SDI signal transmissions.
  • 12G-SDI SupportFour output connectors can be added to support 12G-SDI, 3G-SDI (level A, level B) and HD-SDI (including dual links).In addition, it corresponds to the 8K video signal by adding 8K software option.
  • Audio EmbeddingThe LT 4611 can embed 32 channels (stream 1, stream 2, 4 channels each × 4 groups) of audio signals for 3G-SDI level B and 16 channels (4 channels × 4 groups) of audio signals for 3G-SDI level A, HD-SDI, and SD-HDI. The frequency, level, and the click can be set for each channel.
  • AES/EBU Signal OutputThe LT 4611 can output a 48 kHz AES/EBU signal synchronized with the video signals. It is also equipped with a muted AES/EBU signal output.
  • Word-Clock Signal OutputThe LT 4611 can output a 48 kHz word-clock signal synchronized with video signals.
  • Real Time ClockThe real time clock is backed up by a battery. There is no need to reset the clock even when the power is turned off and on.
  • EthernetSNMP is supported. When an error is detected, a TRAP is generated. Further, the LT4610 can be controlled through HTTP.
  • Preset Memory FunctionUp to 10 presets can be saved. Convenient registered presets can be recalled during operation. The LT 4611 can be started with the same settings every time.
  • External Memory SupportLogo data and preset data can be written and saved from the front panel using USB memory devices.
  • Redundant Power SupplyTwo power supplies are built in to provide redundancy. When errors occur in power supply units, alarms are indicated on the LT4610 front panel. Errors can also be output as alarms using SNMP traps.
  • Web BrowserYou can use ETHERNET to control the instrument from a web browser.

The LT4610 is a 1U full rack size sync generator that can operate in synchronization with GPS, PTP, CW, and internal reference signals, as well as Genlock that supports external analog video synchronization signals.It supports analog video sync signals, AES / EBU digital audio output, word clock, and time code, and also supports 3G / HD / SD-SDI output and 12G-SDI output compatible with 4K and 8K.In addition, it supports the PTP grand master function and PTP slave function, and can manage the optimum synchronization system according to the system.The genlock function is equipped with a STAY IN SYNC function that retains the phase when an abnormality occurs in the input analog video synchronization signal, and the power supply unit performs redundant operation, enabling highly reliable system construction.

Features

  • Genlock FunctionVarious output signals can be synchronized by applying NTSC/PAL black burst signals, which are analog video sync signals, and HDTV tri-level sync signals.NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported.
  • Stay-in-Sync and Slow Lock FunctionsA Stay-in-Sync function is available in case errors occur at the genlock input. In addition, a slow lock function is available to reduce the shock that occurs when genlock is performed again based on stay-in-sync. This makes it possible to construct an extremely reliable synchronization system.
  • Analog Video Sync Signal OutputSix analog video sync signals can be output. The phase of each output can be adjusted independently.NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported.
  • GPS/BDS SynchronizationGNSS antenna can be connected to generate and output signals by locking to the frequency and clock obtained from the GPS or BDS.
  • PTPPTP synchronization corresponds to the grandmaster and slave functions.You can choose reference signal from PTP, GPS, analog BB or internal.
  • Time Code I/OThe ATC (LTC) can be embedded in LTC outputs from internal time, GPS, LTC, and VITC time information, and SDI signal outputs, or VITC in analog video synchronous signal outputs.
  • Triple-rate SDI ReadySDI signal output supports 3G-SDI (level A and level B), HD-SDI (including dual link), and SD-SDI. There are two independent outputs of SDI signal at output terminals. The pattern and phase can be set separately for each. (However, only a single output is available for 3G-SDI level B and HD dual link.)
  • Lip Sync PatternsThis option can output lip sync patterns in which the video and audio are synchronized. In combination with a waveform monitor that features a lip sync function, such as the Leader’s LV5600, it is possible to measure the offset between the video and audio in SDI signal transmissions.
  • 12G-SDI SupportFour output connectors can be added to support 12G-SDI, 3G-SDI (level A, level B) and HD-SDI (including dual links).In addition, it corresponds to the 8K video signal by adding 8K software option.
  • Audio EmbeddingThe LT 4610 can embed 32 channels (stream 1, stream 2, 4 channels each × 4 groups) of audio signals for 3G-SDI level B and 16 channels (4 channels × 4 groups) of audio signals for 3G-SDI level A, HD-SDI, and SD-HDI. The frequency, level, and the click can be set for each channel.
  • AES/EBU Signal OutputThe LT 4610 can output a 48 kHz AES/EBU signal synchronized with the video signals. It is also equipped with a muted AES/EBU signal output.
  • Word-Clock Signal OutputThe LT 4610 can output a 48 kHz word-clock signal synchronized with video signals.
  • Real Time ClockThe real time clock is backed up by a battery. There is no need to reset the clock even when the power is turned off and on.
  • EthernetSNMP is supported. When an error is detected, a TRAP is generated. Further, the LT4610 can be controlled through HTTP.
  • Preset Memory FunctionUp to 10 presets can be saved. Convenient registered presets can be recalled during operation. The LT 4610 can be started with the same settings every time.
  • External Memory SupportLogo data and preset data can be written and saved from the front panel using USB memory devices.
  • Redundant Power SupplyTwo power supplies are built in to provide redundancy. When errors occur in power supply units, alarms are indicated on the LT4610 front panel. Errors can also be output as alarms using SNMP traps.
  • Web BrowserYou can use ETHERNET to control the instrument from a web browser.

Rear Panel

The LV5300A WAVEFORM MONITOR is compact without sacrificing performance, supporting SDI signals from SD through 12G rates and including physical layer testing. The LV5300A is a 3U half-rack, short-depth waveform monitor with a built-in 7-inch touch screen display and a full array of buttons and control knobs.The waveform, vector, picture, audio, and eye pattern displays enable simple yet comprehensive measurements and quality control of the widest range of audio and video formats. The status display allows you to assess errors and system stability with both event logs and long-term charts. Audio embedded in SDI signals can be shown on the level, Lissajous, and status displays.

The LV5300A has a DC power input, which enables it to be used in locations where AC power supplies are not available. Moreover, the LV5300A can be battery-operated by installing a battery mount option. With its combination of touch screen, dedicated buttons and knobs, and user-defined screen layouts the LV5300A allows complex measurement and monitoring tasks to be quickly completed in almost any environment.

Features

  • Supports various signal inputsIt supports SD-SDI, HD-SDI, 3G-SDI, 6G-SDI, 12G-SDI single link, 4K 3G-SDI dual link.
  • Excellent operabilityThe LV5300 adopts a 7-inch full HD panel with a touch panel function.
  • Eye pattern displayFrom SD-SDI to 12G-SDI.  In the physical layer measurement of the SDI signal some eye pattern display, jitter display is possible.
  • Customizable layoutVarious items such as video signal waveforms, vector waveforms, and pictures of input signals can be laid out in any position with your favorite size.
  • SDI signal generation functionSDI signal generation function can handle from HD-SDI to 12G-SDI.
  • HDRThe HDR signal level monitoring and the level management at the assumed luminance (Nits) in a display considering OOTF are possible.
  • Focus AssistWe developed a new focus detection algorithm based on nonlinear super-resolution technology; accordingly the focus with high sensitivity can be detected even with low-contrast images, which were conventionally difficult to detect.
MULTI video signal measurement display
SDI status display
Event Log
Phase comparison
Vector variable scale
5BAR Gamut Display
5BAR Gamut Display
5BAR Gamut Display
CINELITE cursor measurement
Cine Light Advance
CINELITE advance vector marker
Cine zone
Cine zone
Cine zone
Cine zone
CINEZONE luminance search function
Audio bar graph display
WEB browser
Mouse operation
Touch panel operation

Rear Panel

The LR2731 is a rack mount adapter used to install a LV7300 rasterizer in a 19-inch EIA standard rack.

Because one side is a blank panel, use it to install a single LV7300.

The LT 4600A multi-format video generator is a compact, 1U half-rack size SDI video signal generator that supports the triple-rate SDI (3G-SDI/HD-SDI/SD-SDI) format. In addition to test pattern output including color bars and SDI check fields, the LT 4600A is equipped with numerous features such as ID characters, QVGA logo marks, safety area markers, audio embedding, genlock function for external reference input signals, and three analog black signal outputs.

Features

  • Triple-rate SDI ReadySupports 3G (level A and level B), HD (including dual link), and SD. The LT 4600A provides two outputs for two signals. The pattern and timing of each signal can be adjusted separately. (However, only one signal can be output for 3G-B and HD (DL).)
  • ID Character OverlayID characters can be overlaid at any position on the display. In addition, ID characters can be scrolled horizontally or displayed in a blinking state for checking whether the display has frozen.
  • Logo Mark OverlayA logo mark up to 320 (dot) × 240 (line) in size (QVGA size) can be overlaid at any position on the display. Logo marks are 4-level monochrome data converted from bitmap data.
  • Safety Area Markers90% and 80% safety area markers can be overlaid on the display. For 3G and HD, a 4:3 aspect marker can also be overlaid.
  • Pattern ScrollingEquipped with a function for scrolling patterns in eight directions. The speed can also be adjusted.
  • Audio EmbeddingThe LT 4600A can embed 32 channels (link A, link B, 4 channels each × 4 groups) of audio signals for 3G-B and 16 channels (4 channels × 4 groups) of audio signals for 3G-A, HD, and SD. The frequency, level, and the like can be set for each channel.
  • Lip Sync PatternsThe LT 4600A can output lip sync patterns in which the video and audio are synchronized. By using Leader’s LV 5770 (A), LV 5800 (A), or LV 7770, the user can accurately measure the lip sync of the video and audio in SDI signals.
  • Genlock FunctionThe LT 4600A can synchronize with NTSC/PAL black burst signals and HD tri-level sync signals. NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported. Furthermore, a Stay-in-Sync function is available in case errors occur at the genlock input.
  • Analog Black OutputEquipped with three pairs of independent black burst signal outputs. The timing can be adjusted by selecting a NTSC/PAL black burst signal or a HD tri-level sync signal whose clock frequency is the same as in the SDI output format. NTSC/PAL black burst signal with field reference pulse and NTSC black burst signal with 10 field IDs are also supported.
  • Word-Clock OutputEquipped with one 48 kHz word-clock output synchronized with video signals.
  • AES/EBU Serial Digital Audio OutputEquipped with two 48 kHz AES/EBU outputs synchronized with video signals.
  • EthernetStandard support for SNMP makes it easy to integrate the LT 4600A in a network environment.
  • External MemoryFirmware updating and user data writing and saving are possible by connecting USB memory devices on the front panel.
  • Preset SettingsUp to 10 presets can be saved. You can recall a preset to start the LT 4600A with the same settings every time.
  • AC Power Supply90 to 250 VAC, 25W max. power consumption
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