User Manual MV1-D1312(I) CameraLinkÂ®Series - Machine Vision

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4 FunctionalitySome thinner CameraLink ® cables have a predefined direction. In these cablesnot all twisted pairs are separately shielded to meet the RS644 standard. Thesepairs are used for the transmission of the RX/TX and for the CC1 to CC4 lowfrequency control signals.Figure 4.17: LFSR test pattern received at the frame grabber and typical histogram for error-free datatransmissionFigure 4.18: LFSR test pattern received at the frame grabber and histogram containing transmission errorsCameraLink ® cables contain wire pairs, which are twisted in such a way that thecable impedance matches with the LVDS driver and receiver impedance. Excessstress on the cable results in transmission errors which causes distorted images.Therefore, please do not stretch and bend a CameraLink cable.In robots applications, the stress that is applied to the CameraLink ® cable is especially high dueto the fast movement of the robot arm. For such applications, special drag chain capable cablesare available. Please contact the Photonfocus Support for consulting expertise. AppropriateCameraLink ® cable solutions are available from Photonfocus..30
4.4 Image Correction4.4.1 OverviewThe camera possesses image pre-processing features, that compensate for non-uniformitiescaused by the sensor, the lens or the illumination. This method of improving the image qualityis generally known as ’Shading Correction’ or ’Flat Field Correction’ and consists of acombination of offset correction, gain correction and pixel interpolation.Since the correction is performed in hardware, there is no performance limitationof the cameras for high frame rates.The offset correction subtracts a configurable positive or negative value from the live imageand thus reduces the fixed pattern noise of the CMOS sensor. In addition, hot pixels can beremoved by interpolation. The gain correction can be used to flatten uneven illumination or tocompensate shading effects of a lens. Both offset and gain correction work on a pixel-per-pixelbasis, i.e. every pixel is corrected separately. For the correction, a black reference and a greyreference image are required. Then, the correction values are determined automatically in thecamera.Do not set any reference images when gain or LUT is enabled! Read the followingsections very carefully.Correction values of both reference images can be saved into the internal flash memory, butthis overwrites the factory presets. Then the reference images that are delivered by factorycannot be restored anymore.4.4.2 Offset Correction (FPN, Hot Pixels)The offset correction is based on a black reference image, which is taken at no illumination(e.g. lens aperture completely closed). The black reference image contains the fixed-patternnoise of the sensor, which can be subtracted from the live images in order to minimise thestatic noise.Offset correction algorithmAfter configuring the camera with a black reference image, the camera is ready to apply theoffset correction:1. Determine the average value of the black reference image.2. Subtract the black reference image from the average value.3. Mark pixels that have a grey level higher than 252 DN (@ 10 bit) as hot pixels.4. Store the result in the camera as the offset correction matrix.5. During image acquisition, subtract the correction matrix from the acquired image andinterpolate the hot pixels (see Section 4.4.2).4.4 Image Correction 31
Page 1: User ManualMV1-D1312(I) CameraLink
Page 5 and 6: Contents1 Preface 71.1 About Photon
Page 8 and 9: CONTENTS6
Page 10 and 11: 1 PrefaceReproduction of this manua
Page 12 and 13: 2 How to get started (CameraLink ®
Page 14: 2 How to get started (CameraLink ®
Page 18 and 19: 3 Product SpecificationMV1-D1312(I)
Page 20 and 21: 3 Product Specification60%QERespons
Page 22 and 23: 3 Product Specification20
Page 24 and 25: 4 FunctionalitySimultaneous readout
Page 26 and 27: 4 FunctionalityBlack Level Adjustme
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Page 40 and 41: 4 FunctionalityROI Dimension [Stand
Page 42 and 43: 4 FunctionalityWidth ROI-X (MV1-D13
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Page 46 and 47: 5 Hardware Interface5.1.3 Trigger a
Page 48 and 49: 5 Hardware InterfaceSerial communic
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Page 52 and 53: 5 Hardware Interface5.4 Trigger5.4.
Page 54 and 55: 5 Hardware InterfaceFor the delay i
Page 56 and 57: 6 The PFRemote Control Tool• PFCA
Page 58 and 59: 6 The PFRemote Control Tool6.5.3 Ma
Page 60 and 61: 7 Graphical User Interface (GUI)7.1
Page 66 and 67: 7 Graphical User Interface (GUI)Gai
Page 76 and 77: 7 Graphical User Interface (GUI)If
Page 78 and 79: 7 Graphical User Interface (GUI)76
Page 80 and 81: 8 Mechanical and Optical Considerat
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8 Mechanical and Optical Considerat
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9 Warranty82
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10 References84
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$#%"!A PinoutsFigure A.2: Power sup
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A Pinouts88
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User Manual MV1-D1312(I) CameraLinkÂ®Series - Machine Vision

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