Kumvetsetsa Pixelisi za Digital mu kujambula
Ngati muyang'ana pazithunzi za kamera iliyonse ya digito mudzawona awiri mndandanda wa chiwerengero cha pixel: chogwira ntchito ndi chenicheni (kapena chiwerengero).
Nchifukwa chiyani pali ziwerengero ziwiri ndipo zimatanthauza chiyani? Yankho la funso limeneli ndi lovuta ndipo limakhala lokongola luso, choncho tiyeni tiyang'ane payekha.
Kodi Pixels Yothandiza Ndi Chiyani?
Zithunzi zamakono a kamera zimakhala ndi pixeli zingapo, zomwe zimasonkhanitsa photons (magetsi a kuwala). Photodiode ndiye amatembenuza photons kuti azigwiritsira ntchito magetsi. Pixel iliyonse ili ndi photodiode imodzi yokha.
Ma pixel ogwira mtima ndi ma pixel amene akugwiradi deta. Iwo ali othandiza ndi kutanthawuza, njira zowonjezera "zopambana pakupanga zotsatira zofunidwa kapena zotsatira zolingalira." Awa ndi pixels omwe akugwira ntchito pojambula chithunzi.
Chithunzithunzi chachilendo, mwachitsanzo, kamera ya 12MP ( megapixel ) ili ndi nambala yofanana ya pixels (11.9MP). Choncho, ma pixel ogwira ntchito amatanthawuza malo a sensa yomwe mapiritsi a 'kugwira ntchito' akuphimba.
Nthaŵi zina, sizithunzithunzi zonse za sensor zingagwiritsidwe ntchito (mwachitsanzo, ngati lens silingakhoze kutsegula mtundu wonse wa sensor).
Kodi Zenizeni Zenizeni ndi Ziti?
Chiwerengero chenicheni cha pixel chajambulira kamera chimaphatikizapo kuti (pafupifupi) 0.1% ya pixel yasiyidwa pambuyo powerenga pixel yothandiza. Amagwiritsidwa ntchito kudziwa mapiri a fano ndi kupereka mauthenga a mtundu.
Ma pixel otsalawa akuyang'ana pambali pa chithunzi chajambula ndipo amatetezedwa kuti asalandire kuwala koma adagwiritsidwabe ntchito ngati mfundo yomwe ingathandize kuchepetsa phokoso. Amalandira chizindikiro chomwe chimauza chithunzithunzi kuti pali "mdima" wamtundu wanji pamene akuwonekera ndipo kamera imalipiritsa izo mwa kusintha kusintha kwa ma pixel opambana.
Zomwe zikutanthawuza kwa inu ndikuti nthawi yayitali, monga yotengedwa usiku, iyenera kuchepetsa phokoso la phokoso m'madera akuya a chithunzichi. Panali ntchito zambiri zamatenthete pamene shutter ya kamera inali yotseguka, zomwe zinapangitsa ma pixel apansi kuti ayambe kugwira ntchito, kuwuza makina a kamera kuti pangakhale malo ambiri a mthunzi omwe angakhale nawo.
Kodi Pixels za Interpolated ndi ziti?
Chinthu chinanso chodetsa nkhaŵa ndi makina a kamera ndi chakuti makamera ena amatha kutanthauzira chiwerengero cha ma pixels a sensor.
Mwachitsanzo, kamera 6MP ikhoza kutulutsa zithunzi 12MP. Pankhaniyi, kamera imapanga mapikseli atsopano pafupi ndi ma megapixels 6 omwe analandidwa kuti apange ma digapixels 12 a zowonjezera.
Kukula kwa fayilo kumawonjezeka ndipo izi zimabweretsa chifaniziro chabwino kuposa ngati mutasintha pazithunzi za mapulogalamu a mapulogalamu chifukwa chakuti kutanthauzira kwachitika pamaso pa JPG.
Komabe, nthawi zonse n'kofunika kukumbukira kuti interpolation silingayambe kulenga deta yomwe siinatengedwe poyamba. Kusiyanitsa kwa khalidwe pogwiritsa ntchito kutanthauzira mawu mu kamera kuli pamtunda.