VISHIST
(Statement)
Obtain the histogram (brightness distribution) of the screen.
VISHIST <window number>, <coordinate X>, <coordinate Y>
<window number>
Specifies the window number (0 to 511).
<coordinate X>
Specifies the X coordinate (0 to 511).
<coordinate Y>
Specifies the Y coordinate (0 to 479).
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Specifies the process area with a window.
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If the designated window position is out of screen, the execution will result in an error.
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The only possible window shape that you may designate is a rectangle with 0 degrees. If another window shape is designated, an error will result.
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The processing object is the screen designated with VISWORKPLN.
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It is possible to read the processing result with the VISREFHIST instruction.
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The memory stores the processing result. It will be kept until this instruction is executed again.
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For this instruction, a µVision board (option) is required.
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WINDMAKE R,1,100,100,0,2
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'Set window 1 to rectangle
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CAMIN 1
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'Obtain a camera image from the storage memory
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VISWORKPLN 0
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'Set the processing object screen for storage memory 0
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VISHIST 1,100,100
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'Execute the histogram for window 1 with the coordinates
'(100, 100) as the home position
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FOR I1 = 0 TO 255
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I2 = VISREFHIST(I1)
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'Assign the distribution data of
'the brightness value I1 to I2
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VISLOC 10, 10
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'Set the display position
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VISDEFCHAR 1,1,3
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'Designate the display character size
'and the display mode
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VISPRINT "Distribution data=";I2
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NEXT I1
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