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Hvad er opløsning af det menneskelige øje? Hvor mange megapixel?
For det første, jeg vil gerne starte med stat at det menneskelige øje er en analog struktur og det er ikke helt muligt at måle det med en digital sigt pixelstørrelse. Vision center i hjernen kan ikke pereive den lys oplysninger fra øjne som en film gardin. Opretter et billede ved at kommentere oplysningerne lys fra hjernen. Dette billede er konstant opdateret, afhængigt af hastigheden af neuroner, der går ind i hjernen, dvs nerand celler.
For eksempel, hvis vi anser det for en værdi af fps (indramme per other), er 30fps i en video film tilstrækkelig for vores øjne at se billedet helt flydende. Men det betyder ikke, at det menneskelige øje er 30fps. Det menneskelige øje har en vis tærskelværdi, og når du ser på en forbipasserende-objekt, der er hurtigere end værdien, det kan ikke fange hans bevægelser og ser det som intet er gået. Ved hjælp af kameraer med høje lukkertider anvendte nu til dags, kan bevægelsen af en kugle være let examained i millisekunder.
Vi kan gøre en simpel test for hastigheden af det menneskelige øje. For det første bringe lodret scanning-frekvens af din computerskærm til CRT (cathode tube) til 60 Hz. For at gøre dette, Højreklik på skrivebordet og vælg egenskaber, og følg derefter fanerne skærm for at få adgang til indstillingerne for Hz. Efter at have det til 60 Hz, kig på skærmen i en afstand af 30cm, fokusere på et objekt på siden af skærmen, men se skærm med øjet spids. Du vil opdage, hvordan skærmen opdateringshastighed, som du normalt ikke føler, når du ser lige er scannet fra top til bund. Hvis du bemærker 60 Hz, mens du ser på det normalt, kan du prøve det på 75 Hz. Jeg kan klare det selv til 75 Hz, men jeg kan ikke se nogen mere sideovergange ved 85 Hz og ovenfor. Hastigheden af øjet kan variere fra person til individuelle. Mennesker, der følger konstant detaljerede og levende ting med deres øjne og arbejde meget carely med høj-eye reflekser er set hurtigere.
Nethinden med de lys sensorer i vore øjne er en membran, bestående af en neurale struktur. Lys sensorer i nethinden er størrelsen af de digitale kameraer samt sensorer. I virkeligheden, i pit del af nethinden (fovea), antallet af disse sensorer er mere end andre regioner og lyset falder på nethinden er komprimeret i hjernen. At 's hvorfor vi ser på os nogle gange og vi se måde er de. Antallet af lyssensor celler i vores øjne (eller sige pixel) er ikke tilgivet af kvaliteten af vision, så længe det er over en vis kritisk værdi. Fordi hjernen fuldender billedet. Selvom vi ikke har det ene øje, vores billedopløsning er ikke deccreased, bare en lille smule dybde følelse forsvinder. Vi kan ikke se en del af billedet mangler, selv i tilfælde, hvor størstedelen af de lys celler i øjet ruained, kaldet "Nethindeløsning". Vi kan se på det sådan her: du lukke halvdelen linsen på dit kamera, men du stadig se billedet fuld; Fordi kameraets processor fuldender den manglende del.
For at udtrykke det øje vision kapacitet som megapiels, er det nødvendigt at teste for øjnene af receptorer i pixels, tænker om hvilken detaljeringsgrad hjernen kan oprette. Det menneskelige øje er en lille orgel og det gør alle tingene med en lille mængde lys, der kommer på den. Men linser af høj-megapixel kameraer er ganske stort, og afhængigt af det, de ser meget mere oplyste områder i en mørk scene end det menneskelige øje. Det er muligt at sige klart, at hvis du tager den højeste megapixel sats med en eye-størrelse linse og derefter trække fotografiet og sammenligne det med det samme landskab, er jeg sikker på det menneskelige øje kan være flere detaljer og. Fotografi taget af digital maskinen vil forstå at det kan fange en masse mindre detaljer, hvis det er ved at blive fotograferet og undersøges på samme måde, at mennesker ses uden zoom.
Derfor, det menneskelige øje er et organ, der er også perfekt til at blive sammenlignet med billedet af kunstige linser. Men digitale data kan udtrykkes som megapiels. Hvis de betingelser, der er nævnt ovenfor, kan beregningen udføres ved at placere en værdi af ca. Men vi bør ikke kunne synes, at begrebet megapiels er intet, men et begreb, der viser, hvor mange pixels der faktisk vises i en scene. Selvfølgelig, flere pixels vil det se, den nærmere det er, men hvis du vil sammenligne den andel af det menneskelige øje, er det nødvendigt at insider som en vigtig forskning om og investiggate og eksperimenterende i laboratorieforhold.
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svenska
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việt
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