구차니의 잡동사니 모음

LD 렌즈 적용해서 IR 색수차(?) 보정해준다는 의미

간단하게 촛점이 뭉개지는게 덜해져요 정도가 될거 같기도 하고?

[링크 : http://www.oemcameras.com/blog/ir-corrected-vs-standard-lenses/]

[링크 : https://en.wikipedia.org/wiki/Dispersion_(optics)]

ccd는 영상을 받는 방법이라고 한다면

cmos는 반도체 공정이긴 하지만 좀 심하게 많이 다른 의미로 쓰는 듯?

아무튼 ccd는 데이터가 아날로그로 나오지만 글로벌 셔터개념이라면

cmos는 셀 별로 adc가 달려서 디지털로 나온다. 하지만 기본은 롤링 셔터. 글로벌 셔터도 가능

[링크 : http://petapixel.com/2016/05/10/infographic-difference-cmos-ccd-sensors/]

[링크 : http://www.diffen.com/difference/CCD_vs_CMOS]

[링크 : https://www.teledynedalsa.com/imaging/knowledge-center/appnotes/ccd-vs-cmos/]

방송용 카메라의 경우 front focus ring과 back focus ring이 존재하는데

back focus ring을 조절하면 zoom in/out 시에도 촛점을 놓치지 않고 잘 잡는 듯?

[링크 : https://www.youtube.com/watch?v=qIYvYvkblMs]

[링크 : http://nofilmschool.com/2011/12/set-backfocus-video-camera]

[링크 : https://www.youtube.com/watch?v=28NPkAJGC6s]

If you find that your focus is sharp when you are zoomed in but soft when zoomed out, your back focus needs adjusting. This normally only happens to cameras with detachable lenses — consumer-level camera users shouldn't have to worry about it.

Technical Note: Back focus refers to the "focal flange length". This is the distance between the rear lens element and the CCD.

[링크 : http://www.mediacollege.com/video/camera/focus/back-focus.html]

[링크 : https://www.videouniversity.com/articles/adjusting-the-back-focus-of-a-lens/]

물론 back focusing과 front-focusing은 촛점을 잡을때 심도에 따른 구분인걸로.. back focus와는 또 다른 용어 같고...

Back-focusing and front-focusing is when the auto-focus consistently is slightly off in either direction.

[링크 : http://photo.stackexchange.com/questions/900/what-is-back-focusing]

inner focus 는 또 다른 용어 같은데.. 어렵네..

An internal focus lens (sometimes known as IF) is a photographic lens design in which focus is shifted by moving the inner lens group or groups only, without any rotation or shifting of the front lens element.

[링크 : https://en.wikipedia.org/wiki/Internal_focusing]

크게 쓸일이 느껴지진 않지만....

그래도 지원하는게 의외로 얼마 안되는구나..

[링크 : http://support-kr.canon-ci.co.kr/contents/KR/KR/8201440300.html]

사이즈는... 영어고 크기는 한글? ㅋㅋ

센서 사이즈는 대개 대각선 인치 단위인데

크기는 가로세로 mm 단위

그나저나.. 1인치 라고 해도 의외로 크진 않겠구나 싶어지네..

2/3 인치만 해도 CCTV에서 크다고 하는데..

암만 그래봤자 APS-C(canon) 보다 작다는게...

[링크 : http://photohistory.tistory.com/11906]

결론(?)은 HPF(High Pass Filter) 인가?

The simplest way to detect microcontrast is through a high pass filter (HPF). In the areas in focus, the detail will trigger a threshold set in the HPF, while out of focus areas wont's do so for being totally blurred in terms of high spatial frequencies.

[링크 : http://forum.luminous-landscape.com/index.php?topic=56246.0]

The simple recipe is to convolve with a Laplacian of Gaussian kernel (3x3, with 8 in the middle surrounded by -1 and take the abs(result)) .

[링크 : http://photo.stackexchange.com/questions/32388/how-can-i-focus-peak-a-photograph]

[링크 : http://cpn.canon-europe.com/.../flash_exposure_lock_and_compensation.do]

[링크 : http://ran.innori.com/655]

  [링크 : http://ran.innori.com/662] 추천

[링크 : http://morningcoffee.pe.kr/xe/Photo_Lecture/30758]

[링크 : http://mena.tistory.com/481]

[링크 : http://www.monthlyphoto.com/digital/photoshop_view.asp?m_seq=2&s_seq=49&page=]