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Chuan nen H.264 la gi?

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Chuan H.264

Chuan nen hinh anh la gi?
Chuan nen hinh anh duoc hieu don gian do la mot phuong thuc nen hinh anh nham lam giam luong du lieu cua mot tap tai lieu video. Phuong thuc nay duoc cac to chuc co uy tin tren the gioi cong nhan va dua vao su dung. vi vay no duoc coi la mot chuan.
Ten cua chuan nen do to chuc phat trien, quy dinh va dat ten.
Hien nay tren the gioi co nhieu chuan nen hinh anh ra doi theo thoi gian, cac chuan nen hinh anh cang ve sau cang co nhieu cai tien ve cong nghe nen. Tuc la luong du lieu hay noi cach khac kich thuoc cua tap tin video sau khi nen duoc giam nhieu hon so voi cac chuan nen truoc, nhung chat luong lai tot hon. Dong nghia voi dieu do la cac thuat toan va phuong thuc xu ly ngay cang phuc tap hon.
H.264 la gi?
h.264 la chuan nen mo duoc cong bo chinh thuc vao nam 2003, hien la chuan ho tro cong nghe nen tien tien va hieu qua nhat hien nay. Va no dang dan duoc dua vao thanh chuan nen tieu chuan cua nganh cong nghe an ninh giam sat bang hinh anh. H.264 no ke thua nhung uu diem noi troi cua nhung chuan nen truoc day. Dong thoi su dung nhung thuat toan nen va phuong thuc truyen hinh anh moi phuc tap, phuong phap nen va truyen hinh anh ma chuan H.264 su dung da lam giam dang ke du lieu va bang thong truyen di cua video.

camera quan sat

chuan H264

Voi cach nen va truyen thong tin bang chuan H.264 lam giam den 50% bang thong va kich thuoc file du lieu luu tru so voi cach nen thong thuong hien nay (chuan nen thong thuong hien nay dang duoc su dung rong rai la MPEG-4 part 2) va giam toi hon 80% bang thong va kich thuoc file du lieu luu tru so voi nen bang chuan Motion JPEG. Dieu do cho chung ta thay voi cung mot he thong neu chung ta su dung chuan nen moi chung ta co thoi gian luu tru gap doi va bang thong mang giam di mot nua, loi ich ma chung ta thay ngay do la chi phi cho luu tru du lieu video giam mot nua so voi dung he thong co chuan nen thong thuong. Ngoai ra viec truyen hinh anh chiem bang thong giam mot nua, vi vay chi phi danh cho the bang thong mang cung giam dang ke. Hoac chung ta co the tang chat luong hinh anh giam sat len gap doi nhung van dam bao duoc thoi gian luu tru nhu truoc day. Day la mot loi the rat lon, boi voi mot he thong an ninh lon, giai quyet van de bang thong mang va thoi gian luu tru la rat phuc tap. Voi chuan nen H.264 no da giai quyet duoc rat nhieu nhung kho khan nhu vay.

lap dat camera quan sat


Voi viec giam duoc bang thong cua chuan nen H.264 da thuc day cho dong camera do net cao (hay con goi la camera megapixel) co co hoi phat trien manh me. Voi nhung he thong giam sat quan trong can hinh anh ro net thi lua chon cac camera do net cao va dau ghi ho tro chuan nen H.264 la hoan toan hop ly.
Chuan nen H.264 duoc ky vong la con gio moi, tao them sinh khi de thuc day su pht trien cua nganh an ninh giam sat phat trien manh me hon.

San pham ky thuat

Mang
1. Chuan nen mang: H.264 / MPEG4 ? MJPEG
2. Nhieu Video Streaming (Encode Modes, IPS, Resolution) 3 (H.264, MJPEG, MPEG4)
3. LAN Port : YES
4. Wireless: NO
5. PoE: NO
6. Toc do mang LAN: 10/100 Based-T Ethernet
7. Ho tro cac giao thuc: DDNS, PPPoE, DHCP, NTP, SNTP, TCP/IP ....
8. Frame Rate : NTSC: 30, PAL: 25
9. So luong nguoi dung online: 10
10. An ninh: Voi nhieu cap bao ve mat khau cho nguoi dung truy cap
11. Web quan ly
12. (1) Voi cac trinh duyet web, chang han nhu Internet Explorer, Molizza FireFox....
13. (2) Mien phi phan mem CMS, Video Viewer, cho den 16 Camera cung mot luc dieu khien mang
14. ONVIF Tuong thich: Co

lap dat camera quan sat

  • Mar 12, 2012 @ 8:17 pm | delete
    Great lens you have here. Well done.
Show All

Camera

1. Cam bien hinh anh: 1/3 '' live MOS image sensor
2. Do phan giai: XVGA cho QVGA
3. Min chieu sang: 0,1 Lux / F1.5, 0 Lux (LED ON )
4. Toc do chup: 1/60 (1 / 50) den 1 / 100.000 giay.
5. He so nhieu: Hon 48 dB
6. Ong kinh: f4.0mm/ F1.5
7. Goc nhin 75
8. Chieu sang: den LED trang
9. Can bang trang : ATW
10. AGC: Tu dong
11. IRIS Mode: AES
12. Audio: co
13. Nguon dien
14. Nhiet do: 0 do den 40 do C

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tranducthanh

H264 la chuan nen mo duoc cong bo chinh thuc vao nam 2003, hien la chuanho tro cong nghe nen tien tien va hieu qua nhat hien nay. Va no dang dan duoc... more »

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