Desert Star FrogEye FC-2 Operator's Manual
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Contents
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Page 138. Trigger Modes, Motion Imagery and Compression SettingsFrogEye™ offers trigger modes and image compression methods to support both individual stills and motion imagery.Trigger ModesTrigger modes are selected through the Trigger menu.• Auto is the most common setting. A still image is acquired as soon as the trigger button is pressed. Motionsequence acquisition starts after about ½ second and continues until the trigger button is released.• Motion causes a motion sequence to start as soon as the trigger button is pressed. Offers fastest response formotion sequences.• Delay shots a single still about five seconds after pressing the trigger. A yellow square appears in the upper rightcorner of the viewfinder and slowly turns orange. The square turns red at the moment of image acquisition. Thismode is useful for long telephoto operation on tripod. The delay period allows tripod vibrations to subside beforethe image is acquired.Compression SettingsFrogEye™ can store raw images or compress images using multiple formats. The selection is made independently forStill and Motion images using the respective menu.• RAW is generally recommended for still images. While the file size islargest (669 KB for the NVD sensor and 2041KB for the color sensor),this format maintains all image information including small detail andthe full brightness range. RAW is not available for motion imagery.• JPG (JPEG) is available in LOW, MED, HIGH and BEST settings.LOW produces the smallest file, while BEST produces the best imagequality. File size varies from about 60KB to about 1000 KB for thecolor sensor. JPEG is only available for still images.• BTC (block truncation coding) is a fast compression method suitablefor motion imagery. BTC will maintain and sharpen edges, and is thusa good choice for imaging structures and machinery. It is available inHIGH and BEST settings, with file sizes of about 50 KB to 250 KB forthe color sensor. Block truncation coding is the only file formatavailable for motion imagery. A BTM file extension indicates the file ispart of a motion sequence.Image Detail in available compression settings:RAW (2041 KB) BTC High (138 KB) BTC Best (226 KB) JPEG Low (54 KB) JPEG Med (108 KB) JPEG High (353 KB) JPEG Best (991 KB)Motion ImageryFrogEye™ motion imagery shoots images at a constant rate from about 3.5 to 13 frames per second, depending on thesensor and compression selection. Motion imaging is available in the Auto and Motion trigger modes described above.Image quality is determined by the compression setting in the Motion menu. Select High for lower memory use and aslightly higher frame rate or Best for best image quality. Memory consumption is roughly 400/500 KB per second with theHigh setting and 600/800 KB per second with the Best compression setting for the NVD and color sensor respectively.The principal purpose of motion imagery is to obtain many shots of a target during a short period of opportunity.Advantages are an improved probability of a ‘good shot’ of a moving target and the minimization of operator exposure.Motion imagery is also useful to document motion sequences.Motion imagery is stored as individual image files with a .BTM extension. The imgConvert utility will sort each sequenceinto its own folder. |
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