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FLIR Camera Adjustments

LWIR Video Camera

Application Note

FLIR Commercial Systems

70 Castilian Drive
Goleta, CA 93117

Phone: +1.805.964.9797

www.flir.com

Document Number: 102-PS242-100-01
Version: 110
Issue Date: June 2014

Содержание LWIR

Страница 1: ...ra Adjustments LWIR Video Camera Application Note FLIR Commercial Systems 70 Castilian Drive Goleta CA 93117 Phone 1 805 964 9797 www flir com Document Number 102 PS242 100 01 Version 110 Issue Date J...

Страница 2: ...ure 3 Linear AGC ITT Mean 127 Max Gain 8 7 Figure 4 Illustration of the Linear Histogram Mapping Function 8 Figure 5 Plateau 150 ITT Mean 127 Max Gain 8 9 Figure 6 Image Transform Table for Linear and...

Страница 3: ...en Plateau Equalization Information based and Information based Equalization algorithms 21 Figure 23 Illustration of Information Threshold 21 Figure 24 Illustration of Noise Suppression with DDE 23 Fi...

Страница 4: ...LIR cameras using the FLIR Camera Controller GUI Tau 2 Product Specification 102 PS242 40 Product specification and feature description Quark Product Specification 102 PS241 40 Product specification a...

Страница 5: ...What this means is the bit value which increases as pixels get brighter is on the x axis and the number of pixels in the image that have that bit value is on the y axis This is a way of plotting image...

Страница 6: ...ited The FLIR GUI provides auto presets that can be used to tune AGC to the specific scene 2 1 Introduction to Histograms The following histogram is the 14 bit data taken from a Tau 320 with a cold wa...

Страница 7: ...t typically used it will help illustrate the concept of using a transfer funciton to map from one space to another A typical linear intensity transfer table will map the middle 90 of the histogram to...

Страница 8: ...in which the tail rejection parameter selected is 5 The 8 bit values resulting from the above equations are clipped to a minimum value of 0 and a maximum value of 255 a ITT Midpoint 128 b ITT Midpoint...

Страница 9: ...d much more evenly Figure 5 Plateau 150 ITT Mean 127 Max Gain 8 Compare to Linear Histogram in Figure 3 The following plot shows the Image Transform Table for both Linear and Plateau Histogram Equaliz...

Страница 10: ...cene content that is not important It is important to note that higher plateau value distorts the correlation between physical temperature of the scene and level of grey in the image which is preserve...

Страница 11: ...will be more capable of seeing small changes in the scene If you are using analytics the performance will not likely be improved by this change and the default setting of 127 is recommended Figure 7...

Страница 12: ...in setting sets the upper limit of gain that the algorithm can use as it attempts to stretch the data to fill the full 8 bit range If the scene has a high level of contrast it will use much less gain...

Страница 13: ...will devote 60 of the available 8 bit shades to the sky leaving only 40 for the remainder of the image Plateau equalization limits the maximum number of gray shades devoted to any particular portion...

Страница 14: ...emperature in a given scene On the other hand when plateau value is set low the algorithm behaves more like a linear AGC algorithm there is little compression in the resulting 8 bit histogram The figu...

Страница 15: ...little effect For a very bland scene on the other hand it can significantly affect the contrast of the resulting image Figure 17 provides an example a Maximum Gain 6 b Maximum Gain 24 c 8bit Histogram...

Страница 16: ...st but it is important to note that more of the displayed image may be railed 8bit value 0 or 255 by moving the midpoint away from 128 This can be seen in the histogram of Figure 18 a ITT Midpoint 127...

Страница 17: ...ement ACE SSO Value The Smart Scene Optimization SSO value defines the percentage of the histogram that will be allotted a linear mapping Enabling this feature facilitates the avoidance of irradiance...

Страница 18: ...est ROI In some situations it is desirable to have the AGC algorithm ignore a portion of the scene when collecting the histogram For example if the Tau 2 core is rigidly mounted such that the sky will...

Страница 19: ...are in pixels For Tau 2 1 and later a single ROI is specified regardless of zoom see product specification Coordinates for the ROI are as follows Top Bottom 0 center of the window negative values are...

Страница 20: ...ntent lesser gray shades By assigning lesser gray shades to areas with less information e g sky sea roads the fixed pattern noise is reduced in these areas also allowing for more detail to be given to...

Страница 21: ...n the algorithm determining that more of the scene contains information resulting in more areas included in the Information based algorithm and given a higher weighting in the Information based Equali...

Страница 22: ...ss bias m where brightness bias is a user specified parameter 2 5 Digital Data Enhancement DDE The Tau 2 core provides an optional digital data enhancement DDE algorithm which can be used to enhance i...

Страница 23: ...n of Noise Suppression with DDE Notice fixed pattern noise is reduced in the image on the right a DDE index 0 b DDE index 70 Figure 25 Illustration of Detail Enhancement with DDE Note The recommended...

Страница 24: ...E index of x 255 In this case DDE Gain and DDE spatial threshold are adjusted dynamically o DDE spatial threshold ranges from 0 to 15 and represents the threshold of the pre filter smoothing filter ap...

Страница 25: ...Without Isotherms The Tau 2 4 and Quark 2 0 releases and later added a second set of palettes associated with isotherms The cameras detect and image the temperatures in a given scene Within the camer...

Страница 26: ...FLIR Camera Adjustments 102 PS242 100 01 Rev110 June 2014 Page 26 of 28 Figure 29 Isotherm LUT Scale Example WhiteHotIso...

Страница 27: ...RangeBHIso Hot Cold IceFireIso Hot Cold RainbowHCIso Hot Cold RedHotIso Hot Cold GreenHotIso Hot Figure 30 Look Up Table Options with Isotherms 4 0FFC Warning Indicator The camera displays an on scree...

Страница 28: ...minent Symbol can be set in the FLIR Camera Controller GUI using the FFC Warn Time setting in the Analog Video Tab Setting the Warn Time to less than 15 frames turns off the warning When using analyti...

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