Blackfly - CYLOD

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Point Grey Blackfly Technical Reference 8 Blackfly Attributes 8.12 Sharpness The Blackfly supports sharpness adjustment, which refers to the filtering of an image to reduce blurring at image edges. Sharpness is implemented as an average upon a 3x3 block of pixels, and is only applied to the green component of the Bayer tiled pattern. For sharpness values greater than 1000, the pixel is sharpened; for values less than 1000 it is blurred. When sharpness is in auto mode and gain is low, then a small amount of sharpening is applied, which increases as gain decreases. If gain is high, a small amount of blur is applied, increasing as gain increases. When the camera is outputting raw Bayer data, Sharpness is disabled by default. Otherwise, the default setting is enabled. Access this feature using: GenICam Analog Control FlyCapture Example: Setting Sharpness Using the FlyCapture API 8.13 Gamma and Lookup Table The Blackfly supports gamma and lookup table (LUT) functionality. Sensor manufacturers strive to make the transfer characteristics of sensors inherently linear, which means that as the number of photons hitting the imaging sensor increases, the resulting image intensity increases are linear. Gamma can be used to apply a non-linear mapping of the images produced by the camera. Gamma is applied after analog-to-digital conversion and is available in all pixel formats. Gamma values between 0.5 and 1 result in decreased brightness effect, while values between 1 and 4 produce an increased brightness effect. By default, Gamma is enabled and has a value of 1.25. To obtain a linear response, disable gamma. For 8-bit, gamma is applied as: OUT = 255*(IN/255)^1/gamma When Gamma is turned on, Lookup Table is turned off. When Lookup Table is turned on, Gamma is turned off. Lookup Table allows the user to access and control a lookup table (LUT), with entries stored on-board the camera. The LUT is modified under the following circumstances: • Camera reinitialization • Changing the current video mode or current video format • Changing gamma The LUT can define 2 banks where each bank contains 1 channel. A channel defines a table with a length of 2 Input_ Depth entries where each entry is Output_Depth bits wide. Channel table entries are padded to 32-bits. Each bank may be read only, write only or both read and write capable as shown by the LUT_Bank_Rd_Inq and LUT_ Bank_Wr_Inq fields. The active bank is set by writing to the Active_Bank field of the LUT_Ctrl register. Revised 12/13/2012 Copyright ©2012 Point Grey Research Inc. 54
Point Grey Blackfly Technical Reference 8 Blackfly Attributes The Bank_X_Offset_Inq register gives the offset to start address of the array of channel tables in each bank. Multiple channels can be used to process color video pixel data. Lookup Table Data Structure Each bank of channels is composed of entries padded to a complete 32-bits. Each bank is organized as show in the table below. Cn: Channel Number En : Entry Number C(0)E(0) … … C(0)E(2 Input_Depth -1) C(1)E(0) … … C(1)E(2 Input_Depth -1) … … … C(Number_of_Channels-1)E(0) … … C(Number_of_Channels-1) E(2 Input_Depth -1) Related Knowledge Base Articles Title Article How is gamma calculated and applied? Knowledge Base Article 391 Access this feature using: GenICam CSR FlyCapture Analog Control LUT: 80000h – 80048h (IIDC 1.32) Example: Setting Gamma Using the FlyCapture API 8.14 Image Flip/Mirror The camera supports horizontal image mirroring. Revised 12/13/2012 Copyright ©2012 Point Grey Research Inc. 55
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Blackfly - CYLOD

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