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An important parameter is the Triggering Delay value. A value of 0 is meant for ultrafast motion detection (fi. lightning). In this mode, the shoot-button will be pressed half before detection is started, so the actual shooting is very fast. Disadvantage is that (in Auto-mode) the focus/aperture/shutter will be fixed before the moving object is detected (except when using all manual settings like manual focus/aperture/shutter). |
An important parameter is the Triggering Delay value. A value of 0 is meant for ultrafast motion detection (fi. lightning). In this mode, the shoot-button will be pressed half before detection is started, so the actual shooting is very fast. Disadvantage is that (in Auto-mode) the focus/aperture/shutter will be fixed before the moving object is detected (except when using all manual settings like manual focus/aperture/shutter). |
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− | If you choose a value > 0, the shoot-button will not be half-pressed before detection, so the moving object's focus/aperture/shutter will be set after motion is detected. Important: you should be careful that the value is big enough to avoid shoot-looping after first detection. A value of at least |
+ | If you choose a value > 0, the shoot-button will not be half-pressed before detection, so the moving object's focus/aperture/shutter will be set after motion is detected. Important: you should be careful that the value is big enough to avoid shoot-looping after first detection. A value of at least 16 (=1.6 secs) will be ok. |
If you want to motion-detect for longer periods, you should disable the power-save options of your camera, so that your camera will not power-off after a certain time. |
If you want to motion-detect for longer periods, you should disable the power-save options of your camera, so that your camera will not power-off after a certain time. |
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Revision as of 12:26, 5 April 2008
Motion/Lightning Detect
- Written for/on: Canon A640
- Also works on: Other Canon AXXX (Not tested), Canon A720 (tested)
Motion/Lightning Detect by Johan Van Barel (http://www.vanbarel.com)
The purpose of this script is to take pictures when motion is detected. The screen will be divided into a number of Rows and Columns. The Treshold value determines the treshold for detection. Recommended experimental values are 10=Lightning, 12=Sunshine, 24=Cloudy, 36=Dawn/Dusk. Motion can be detected in the following Modes: 0=U, 1=Y, 2=V, 3=R, 4=G, 5=B. The Pixel Blocksize determines how many pixels are seen as one block. Smaller blocks are more accurate but detection will be slower.
An important parameter is the Triggering Delay value. A value of 0 is meant for ultrafast motion detection (fi. lightning). In this mode, the shoot-button will be pressed half before detection is started, so the actual shooting is very fast. Disadvantage is that (in Auto-mode) the focus/aperture/shutter will be fixed before the moving object is detected (except when using all manual settings like manual focus/aperture/shutter). If you choose a value > 0, the shoot-button will not be half-pressed before detection, so the moving object's focus/aperture/shutter will be set after motion is detected. Important: you should be careful that the value is big enough to avoid shoot-looping after first detection. A value of at least 16 (=1.6 secs) will be ok. If you want to motion-detect for longer periods, you should disable the power-save options of your camera, so that your camera will not power-off after a certain time.
Documentation/Help (save as MotionDetect.txt" file to your /CHDK/SCRIPTS/ folder)
Select P, Tv, Av, M or C mode on your Canon A640.
Parameters:
- Number Of Columns (Default=6)
- Number Of Rows (Default=4)
- Treshold (0-255) (Default=24) recommended values: 10=Lightning, 12=Sunshine, 24=Cloudy, 36=Dawn/Dusk
- Comparison Interval (mSec) (Default=1)
- Triggering Delay (.1 Sec) (Default=0) recommended values: 0=Ultrafast(Lightning), 16=Normal, 32=Slow
- Pixel BlockSize (Default=8) number of pixels as one block (smaller size is more accurate but slower)
- Detection Mode (Default=1) values: 0=U, 1=Y, 2=V, 3=R, 4=G, 5=B
- Initial Delay (Sec) (Default=1)
Script Code (save as "MotionDetect.bas" to your /CHDK/SCRIPTS/ folder)
rem Johan Van Barel 05-04-2008 rem Motion/Lightning-Detect for Canon A640 @title Motion Detect @param a Cols @default a 6 @param b Rows @default b 4 rem Treshold: 10=Lightning, 12=Sunshine, 24=Cloudy, 36=Dawn/Dusk @param c Threshold (0-255) @default c 24 @param d Interval (mSec) @default d 1 rem Delay: 0=Ultrafast(Lightning), 16=Normal, 32=Slow @param e Delay (.1 Sec)(0=UltraFast) @default e 0 @param f BlockSize @default f 8 @param g Mode(U=0,Y=1,V=2) @default g 1 @param h Initial Delay (Sec) @default h 1 if a<1 then a=1 if b<1 then b=1 if c<0 then c=0 if e<0 then e=0 if f<1 then f=1 if g<0 then g=0 if g>5 then g=5 if r<0 then r=0 if h<0 then h=0 e=e*100 rem time in msecs md will detect x=5000 sleep h*1000 i=0 while 1 if e=0 then press "shoot_half" do get_prop 205 p until p=1 endif t=0 md_detect_motion a, b, g, x, d, c, 1, t, 0, 1, 1, a, b, 0, f, e if t>0 then click "shoot_full" do get_prop 205 p until p<>1 i=i+1 print "Pic", i, "(blocks="; t; ")" endif wend