digitalcamera digital camera 1
October 12, 2010
Justlikeaconventionalcamera, adigitalcamerahasaseriesoflensesthatfocusli ghttocreateanimageofascene.Butinsteadoffocusingthis lightontoapieceoffilm, itfocusesitontoasemiconductor devicethatrecordslightelectronically.Amicroprocesso rthenbreaksthiselectronicinformationdownintodigital data.
With conventional cameras, digital camera is a lens through the process accumulate to form the light, like the scene. However, digital cameras, the light does not accumulate in the film, but accumulate in the form of electronically stored light signal flags signal flags on the semiconductor devices. After the micro-renew, converts these electrical information into digital data. ImageSensors
Theimagesensoremployedbymostdigitalcamerasisacharg ecoupleddevice (CCD). Somelow-endcamerasusecomplement arymetaloxidesemiconductor (CMOS) technology.WhileCMO Ssensorswillalmostcertainlyimproveandbecomemorepop / / arinthefuture, theyprobablywon replaceCCDsensorsin higher-enddigitalcameras.
Image sensor
Eve are using a digital camera image sensor is a CCD device (charge coupled device). Some low-end cameras using CMOS craft. Although the function of the CMOS sensor is bound to advance the future, and will be more popular. However, in the high-end digital camera CMOS sensor is unlikely to replace the CCD sensor. CCDsuseaspecialmanufacturingprocesstocreatetheabil itytotransportchargeacrossthechipwithoutdistortion. Thisprocessleadstoveryhigh-qualitysensorsintermsoff idelityandlightsensitivity.CMOSchips, ontheotherhand, usecompletelystandardmanufacturingprocessestocreat ethechip-thesameprocessesusedtomakemostmicroprocess ors.Becauseofthemanufacturingdifferences, therearese veralnoticeabledifferencesbetweenCCDandCMOSsensors.
CCD device with a remarkable distortion in the manufacturing process without charge to send out. In this process the CCD device fidelity and photosensitivity have very good quality. Instead CMOS devices using a full-scale manufacturing process, this process for the manufacture of Eve and Eve are micro-renew, the process is not device specific. Because of manufacturing differences, CCD sensor and CMOS sensor than the differences between. 1) CCDsensorscreatehigh-quality, low-noiseimages.CMO Ssensors, traditionally, aremoresusceptibletonoise.
2) CMOSsensorstraditionallyconsumelittlepower.CCDs, ontheotherhand, consumeasmuchas100timesmorepowerthan anequivalentCMOSsensor.
1) CCD sensor can occur high-quality, low-noise images. Conventional CMOS sensor is more susceptible to noise.
2) conventional CMOS low power consumption of sensor break; opposite the power consumption of CCD sensor break than neat CMOS sensor 100 times more. 3) CMOS – chipscanbefabricatedonjustaboutanystandard siliconproductionline, sotheytendtobeextremelyinexpe nsivecomparedtoCCDsensors.CCDsensorshavebeenmasspro ducedforalongerperiodoftime, sotheyaremoremature.
3) CMOS silicon chip can be produced at any scale manufacturing line. Is, compared to CCD sensors, CMOS sensors cheaper. However, the size of the CCD sensor Eve produced a very long time, so doubling its manufacturing skills mature.
Resolution
Sometypicalresolutions: thatyoufindindigitalcameras todayinclude:
1) 640 × 480pixels-Thisisthelowendonmost “real” cameras.Thisr esolutionisgreatifyouplantoe-mailmostofyourpictures tofriendsorpostthemonawebsite.Thisis307, 000totalpix els.
resolution camera to capture the details of the amount referred to as resolution, its embrace unit is pixels. The current digital cameras use some of the typical resolution of the following three kinds.
1) 640X480 pixels: This is Eve Eve are low-resolution camera. If you have contemplated the Eve Eve pictures by e-mail sent to a partner or on the site, this resolution is good. The total number of pixels is 307000. 2) 1216 × 912pixels-Ifyouareplanningtoprintyourimages, thisis agoodresolution.Thisisa “megapixel” imagesize-1, 1099, 000totalpixels.
3) 1600 × 1200pixels – Thisis “highresolution” – “Imagestakenwit hthisresolutioncanbeprintedinlargersizes, suchas8 × 10inches, withgoodres / / ts.Thisisalmost2milliontotal pixels.Youcanfindcamerastodaywithupto10.2millionpix els.
2) 1216X912 pixels: If you intend to print the image, the resolution is very good. The total number of pixels is 1109000.
3) 1600X1200 pixels: This is high-resolution In accordance with this resolution the image looks when printed Eve in place (such as: 8X10 inches) is also very good in the end its pixels total close to 2 million today, you can find the total of 12 million pixels camera.
Whatpictureresolutionwillgivemethebestqualityprint sonmyinkjetprinter? Kodakrecommendsthefollowingasmin imumresolutionsfordifferentprintsizes:
inkjet printer, what kind The picture resolution would be the best end? Kodak recommend a minimum resolution size differences. CapturingColor
Inordertogetaf / / lcolorimage, mostsensorsusefilterin gtolookatthelightinitsthreeprimarycolors.Onceallthr eecolorshavebeenrecorded, theycanbeaddedtogethertocr eatethef / / lspectrumofcolors.
color capture in order to obtain full color images, using filters Eve Eve craft will have sensors to differentiate into three primary colors of light once the light all these three documentary down can be added together and place the entire visible spectrum. Thereareseveralwaysofrecordingthethreecolorsinadig italcamera.Thehighestqualitycamerasusethreeseparate sensorseachwithadifferentfilteroverit.Lightisdirect edtothedifferentsensorsbyplacingabeamsplitterinthec amera.Thinkofthelightenteringthecameraaswaterflowin gthroughapipe.Usingabeamsplitterwo / / dbelikedividing anidenticalamountofwaterintothreedifferentpipes.
in digital cameras, there are three types of documentary base shade style. high-quality cameras use three self-sensors, each sensor has a disagreement over the filter in the camera placed spectroscopy, can lead to differences in light sensor, we can put light into the weather camera imagine water flowing through the pipeline. spectroscopic instrument using the same amount of water rationing as the differences between channels. Eachsensorgetsanidenticallookattheimage; butbecause ofthefilters, eachsensoronlyrespondstooneoftheprimar ycolors.Theadvantageofthismethodisthatthecamerareco rdseachofthethreecolorsateachpixellocation, Unfortun ately, camerasthatusethismethodtendtobeb / / kyandexpen sive.
each sensor sees image is exactly the same, nothing more because the filter (the present), each sensor responds only to the three primary colors in one color. The advantage of this style: In each pixel location, the camera documentary of each color, but unfortunately, the use of this style of camera and Eve and expensive. Asecondmethodistorotateaseriesofred, blueandgreenfi ltersinfrontofasinglesensor.Thesensorrecordsthreese parateimagesinrapidsuccession.Thismethodalsoprovide sinformationonallthreecolorsateachpixellocation; but sincethethreeimagesaren takenatpreciselythesame. mo ment, boththecameraandthetargetofthephotomustremains tationaryforallthreereadings . Thisisn practicalforc andidphotographyorhandheldcameras.
Another style is: a group of red, blue, green filter over the sensor to change. sensor rapid, sustained documentary three self-image, which supply kinds of style to each pixel position information on all three colors. nothing more, these three images is not the right time in uniform shooting; so, read this three times, the camera and guidelines necessary to link the image does not move For capture and hand-held cameras, this requirement is unrealistic.
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