Color Imaging - Getting the Best from Multi-Sensor Prism Cameras

Color Imaging - Getting the Best from Multi-Sensor Prism Cameras Paritosh Prayagi Christian Felsheim Product Manager VP Sales EMEA 2017 – H2 Color Imaging Technologies Overview Cameras with On-Pixel Filtering Multi-line Cameras Multi-Sensor Prism Cameras R Optics G Bayer-Pattern Sensor B Imec Mosaic hyperspectral sensor On-Pixel-Filtering Cameras Bayer-Pattern Compact on-sensor color filtering High volume -> low price Sensors with high pixel count available offering large field-of-view (FOV) Most of the light hitting the sensor is blocked and thus lost Color information needs to be interpolated from neighbouring pixels Cross talk between neighbouring pixel resulting in color channel cross talk GbBGbB RGrRGr Inter True Inter- GbBGbB polated green polated RGrRGr 3 Multi-Line Cameras Full color information in every pixel Compact on-sensor color filtering Flexibel: 2 – n lines possible Line scan, only Halo artefacts when • camera is not oriented perpendicular to web • objects are moving unpredictable (e.g. free-fall objects) • 3D objects imaged HALOHALOHALOHALO 4 Multi-Sensor Prism Cameras Full color information in every pixel ! Better color contrast and differentiation R Line and Area scan cameras available No halo effects Light is sperated not blocked off -> high sensitivity No crosstalk between color channels Optics G Full color resolution Customizable color seperation Higher price B Optimized lens required Larger housing Limited pixel count resulting in smaller FOV 5 Getting the Best out Muli-Sensor Prism Cameras R • Select the right lens • Optimize S/N and color contrast • Optimize color seperation Optics • Optimize color channel bandwidth G • On-camera color processing functions • Robostness of Prism Cameras B 6 Lenses Optimized for Multi-Sensor Cameras Single-Sensor Lens Multi-Sensor Lens Smaller angle to optical axis Lens Lens exit pupil exit pupil Single-sensor lenses have a smaller exit pupil, Multi-sensor lenses have a larger exit pupil, resulting into a larger angle of light rays passing resulting into a smaller angle of light rays passing through the dichroic prism through the dichroic prism 7 Chromatic Abberations Caused by Lenses NOT Optimized for Multi-Sensor Cameras 240 180 120 • Prism introduces colour 60 shading 0 (0,23) (1023,23) • Colour shading caused by 256 dichroic filters 192 • Degree of colour shading 128 depends on angle of light 64 rays passing through the 0 (0,371) (1023,371) dichroic layer 256 • Single sensor lenses have 192 128 small exit pupil, resulting 64 into larger angle of light 0 rays passing through (0,748) (1023,748) dichroic layer 240 256 240 180 192 180 120 128 120 60 64 60 0 0 0 8 (26,0) (24,767) (495,0) (495,767) (1004,0) (1004,767) Lenses Optimized for Multi-Sensor Cameras do not Drop in MTF Single-Sensor Lens Multi-Sensor Lens 3 CCD/CMOS lens Single Single sensor lens https://www.fujifilmusa.com/shared/bin/3CCD%20Camera%20Lens.pdf 9 Manufactureres offering Multi-Sensor optimized Lenses 10 Optimize S/N and Color Contrast Silicon Sensitivity Decays in Blue and Red Sony Pregius IMX 249 Absolute QE Absolute 11 Otimize S/N and Color Contrast Adjust gain and exposure time seperately CCD Output Gain Optimized Gain and Exposure Time Optimized 100 % -3dB Level -6dB Signal Signal Signal Noise Noise 0 % Noise B G R B G R B G R +3dB 0dB +6dB +2dB 0dB +3dB 7ms 5ms 9ms Gain and exposure time can be adjusted for every sensor / color channel seperately in ordere optimize S/N and color contrast 12 Optimized S/N and Color Contrast Bayer Pattern Multi-Sensor Prism Camera 13 Optimize Color Separation Steepen filter bandwidth Bayer Pattern Camera 1.0 R 0.8 0.6 0.4 Relative Response Relative 0.2 0 400 450 500 550 600 650 700 Optics G Wavelength (nm) Prism Camera 1.0 0.8 0.6 0.4 B Relative Response Relative 0.2 0 14 400 450 500 550 600 700 Wavelength (nm) Optmized Color Differentiation Bayer Pattern Multi-Sensor Prism Camera 15 Optimize Color Channel Width Shape bandwidth by adding filters Standard Shaped Bands CCD 1 CCD 2 CCD 3 CCD 1 CCD 3 CCD 2 Optics λ1 λ2 λ3 λ1 λ2 λ3 16 Optimize Color Channel Width Bandwidth shaped to fluorescence dye emission band 17 Other Color Channel Bandwidth Seperations 3 Sensor B-G,R,NIR 2 Sensor RGB + NIR 2 InGaAs Sensors SWIR Sugar Salt Rel. Sensitivity Rel. 300 400 500 600 700 800 900 1000 Wavelength [nm] 4 Sensor B,G,R,NIR 3 Sensor RGB,NIR,NIRSimulation_20170727 100 900 nm – 1400 nm 1400 nm – 1700 90 nm 80 70 60 50 40 30 Rel. Sensitivity Rel. Transmission [%] Transmission 20 10 0 300 400 500 600 700 800 900 1000 300 400 500 600 700 800 900 1000 18 Wavelength [nm] Wavelength [nm] On-Camera Color Processing Functions Some prism cameras offer on-head features to further improve color imaging: I • Color Space Conversion – RGB to L*a*b – RGB to HSI – RGB to CIE-XYZ – RGB to sRGB, Adobe RGB – Hue enhancement 19 Robustness of Prism-Cameras in Industrial Applications ?? Ask for vibration and shock and temperatur stability !! +45°C VIBRATION SHOCK 3G 50G -5°C Highly Robust Prism Industrial Cameras are Available ! 20 JAI Color Imaging Portefolio All technologies available from one supplier AREA SCAN CAMERAS LINE SCAN CAMERAS APEX 3 SWEEP+ 3 & 4 R-G-B Sensor R-G-B + NIR Sensor FUSION Dual WAVE Dual Bayer RGB/NIR SWIR (InGaAs) Monochrome Sensor SWIR SPARK Perfor- SWEEP TriTri-- Bayer RGB mance COLOR linear Monochrome linear GO SWEEP Mono Bayer RGB Compact MONOCHROME Monochrome chrome 21 THANK YOU for seeing the possibilities Christian Felsheim Paritosh Prayagi [email protected] [email protected] www.jai.com.

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