Categories: Python | S60 | Code Examples | How To

This page was last modified 16:34, 30 June 2008.

From Forum Nokia Wiki

With the recent launch of Nokia Computer Vision pylib. We can take photos and play around it with a greater range of functionalities. The code below shows how to take a photo using the pycamera (NokiaCV and utilities). Recently we all came to know about a bug using the take_photo of the camera module so this new feature will help a lot in that case.

import e32
 
import pycamera
import sysinfo
 
print "Constructing camera object 0"
cam = pycamera.Camera(0)
 
print "Reserving camera"
cam.Reserve()
 
print "Powering on"
cam.PowerOn()
 
print "Preparing to capture"
 
# (640, 480), (1024, 768), (1600, 1200)
cam.SetResolution((2592, 1944))
 
# EFormat16bitRGB444 , EFormat16BitRGB565, EFormat32BitRGB888 , EFormatFbsBitmapColor16M
# EFormatFbsBitmapColor16MU , EFormatFbsBitmapColor4K , EFormatFbsBitmapColor64K , EFormatJpeg , EFormatMonochrome , EFormatUserDefined
# EFormatYUV420Interleaved,EFormatYUV420Planar,EFormatYUV420SemiPlanar,EFormatYUV422,EFormatYUV422Reversed,EFormatYUV444  
cam.SetFormat(pycamera.EFormatExif)
 
# 5 to 101
cam.SetJpegQuality(101)
 
# 0(Auto) , 50, 100, 200, 400, 800, 1600
cam.SetISO(50)
 
# EExposureManual , EExposureAperturePriority , EExposureAuto,EExposureBacklight,EExposureBeach,EExposureCenter,EExposureInfra,EExposureNight,EExposureProgram,EExposureShutterPriority,EExposureSnow,EExposureSport,EExposureSuperNight,EExposureVeryLong
cam.SetExposureMode(pycamera.EExposureCenter)
 
# - 8 to 9 by step of 0.25
cam.SetExposureCompensation(-4)
 
# EWBAuto , EWBBeach , EWBCloudy , EWBFlash , EWBFluorescent , EWBManual , EWBShade , EWBSnow , EWBTungsten,
#cam.SetWBMode(EWBDayLight)
 
# EFlashAuto , EFlashFillIn,EFlashForced , EFlashLManual , EFlashRedEyeReduce , EFlashSlowFrontSync , EFlashSlowRearSync
#cam.SetFlash(EFlashNone)
 
cam.PrepareForCapture()
 
lock = e32.Ao_lock()
 
photo = None
 
def photo_callback(arg):
    global photo
    print "photo received!"
    print type(arg)
    photo = arg
    lock.signal()
    
cam.SetPhotoCallback(photo_callback)
 
def viewfinder_callback(arg):
    print "viewfinder frame!"
 
cam.SetViewfinderCallback(viewfinder_callback)
 
print "Starting viewfinder"
cam.StartViewfinder()
 
e32.ao_sleep(1)
 
K = 1
 
import appuifw
 
for i in range(K):
    print "Taking photo", i
    print "Free memory: ", sysinfo.free_ram()
    cam.TakePhoto()
    lock.wait()
    canvas = appuifw.Canvas(event_callback = lambda ev: None,
                            redraw_callback = lambda ev: None)
    oldBody = appuifw.app.body
    appuifw.app.body = canvas
    im = pycamera.DecodeJpeg(photo)
    canvas.blit(im)
    
 
e32.ao_sleep(1)
 
appuifw.app.body = oldBody
 
print "Stopping viewfinder"
cam.StopViewfinder()
 
print "Powering off"
cam.PowerOff()
 
print "Releasing"
cam.Release()
 
print "Deleting camera object"
del cam