Nguygn Thi Thanh TSm vd Dtg Tgp chl KHOA HQC & C 6 N G NGHS 99(11) 103 108 MOT GIAI PHAP M 6 I CHO BAI TOAN TH6NG KE S6 LUgfNG SINH VIEN DV Ldp str DVNG PHirofNG PHAP PHAT HIEN KHUON MAT NguyJn Thj Th[.]
Nguygn Thi Thanh TSm vd Dtg Tgp chl KHOA HQC & C6NG NGHS 99(11): 103-108 MOT GIAI PHAP M I CHO BAI TOAN TH6NG KE S6 LUgfNG SINH VIEN DV Ldp str DVNG PHirofNG PHAP PHAT HIEN KHUON MAT NguyJn Thj Thanh Tdm', Nguyen Viin T&\, Nguyen Thj Tfnh, Le Thu Trang Trudng Dgi hpc Cdng ngh^ Ihdng lin vd Truyin thdng - DII Thdi Ng TOM TAT Thdng ke sd lugng sinh vi6n dy Idp Id m^t nhu ciu thyc te dat tgi cdc trudng dgi hpc Hien nay, phucmg phap thu thdp s6 li§u m^t cdch d^c l§p v^ s6 lugng sinh vign dy ldp v§n dugc thyc hi^n thd cfing bang cdch d^m tryc ti^p tgi Idp hpc Ddy Id c6ng vi§c t6n thdi gian vd gdy phi^n todi, inh hudng din gid hpc nfin vi^c thu thdp dtt li^u m$t cich d$c ldp vin chua dugc thyc hifn thudng xuyen Trong bii bdo ndy, chung toi d^ xuil viec sd: dyng phuong phdp phdt hi?n khuon m^t tir inh de dim s6 sinh vifin dy Idp Chung tfii da thyc nghidm vi^c dp dyng phuang phdp phit hi§n khuon mat cda Viola-Jones mfii tmdng Ifip hpc tir d6 phdn tich, ddnh gid khd nang dp dyng tr6n thyc te Kit qud thyc nghidm phdn tich cho thiy gidi phdp chung tfii d^ xuit Id khd thi, diing hudng Tir khfia: bdi todn thong kc, phuang phdp phdt hien khuon m$t Viola-Jones GI6I THIEU Hau het cac trudng dai hpc deu cd nhu cdu thdng ke, phan tich sd lupng sinh vien dy Idp Sd lieu ndy giup cdc bd phan qudn ly nam dugc tinh hinh tham gia hpc tap cua sinh vien timg Idp, mtrc dp hap dan cua bai gidng vd nhieu khia canh khdc Hien viec thu thap du' lieu ve sd lugng sinh vien du Idp mdt each ddc lap, vdi mgt dp dii Idn hau nhu vdn chua dugc thyc hien bdi vi nhimg khd khan, philn phiic Vdi each ldm hien tgi, viec thu thap dir lieu thudng dugc thuc hien bdi cac nhan vien bang each di den dim true tiip tai cdc Idp vao gid hgc Cach ldm tdn cdng sire, nhan luc ddng thdi gay gidn dogn, dnh hudng ddn gid hpc Viec dem tryc tiip hodn cdnh phai nhanh chdng de dd dnh hudng din Idp hgc cung din den sai sdt Vi vay, chiing tdi de xuat mgt giai phap mdi cho viec thu thap dCr lieu Id sii dyng may anh hogc camera ky thuat sd de thu dnh Idp hgc rdi sii dung he thdng tu ddng phat hien khudn mat di hd trg vi?c thu thap sd Ii?u mpt cdch nhanh chdng va chinh xdc Trong nhung nam gin day, phdt hien va nhgn dgng khudn mgt la chu di nghien ciiu thu hut su quan tam cua nhiSu nhd khoa hgc cd tren khia canh nghien ciru phuong phap co bdn cung nhu cac nghien cuu iing dung Da cd ' Tel: 0973 002640, Email ntttam@ictu edu nhieu phuong phap phdl hien, nhan dgng khudn mat dupe nghien ciiu va di xuit [1] Trong do, phuong phdp Viola-Jones [2] dugc ddnh gid Id phuong phap tdt va dugc sir dyng rgng rai hien [3] Theo thdng ke vd xep hgng ciia Microsoft Academic Search [4], bdi bao dau tien trinh bay phuong phdp ViolaJones [5] dugc trich dan 3279 lugt (sd lieu ngdy 10/11/2012) va sd lugng trich ddn van dang lien luc tang Bdi bao ndy xip thir mudi ve sd lugng trich dan ITnh vuc thj gidc mdy tinh, diing thir nhdt bai toan phdt hien khudn mat va phat hien ddi lugng Cdc bai bdo khdc vi phuong phdp ndy [6][2] diu cd hdng nghin lugt trich ddn Diiu dd chirng Id phuong phdp Viola-Jones ngdy cang dugc danh gid cao vd su dyng rgng rai CJ bai bao nay, chiing tdi nghien ciiu dp dyng phuong phdp Viola-Jones viec dem sd lupng sinh vien dy Idp NhiJng ddng gdp cua chung tdi trinh bdy bai bao bao gdm: - Di xuit gidi phap mdi cho bdi todn thdng ke sd lugng sinh vien du Idp sir dyng phuong phap phat hign khudn mat; - Ddnh gia hieu qua ciia phuong phap ViolaJones mdi trudng Idp hpc thdng qua thyc nghiem tir dua kit lugn vi tinh kha thi vd hieu qud ciia giai phdp da de xudt Phdn cdn lai cua bdi bao dugc trinh bay theo ciu true nhu sau: Phin trinh bay gidi phap 103 Nguyen Thi Thanh Tfim vd Dig Tgp chl Kl IOA HQC & C N G N G H $ 99(11): 103-108 giai quyet bdi loan Ihong ke so lugng sinh vien dy ldp sii dyng phuoiig phap phdt hi?n khudn mdt Phan gidi ihipu so luge phuong phap Viola-Jones md chung tdi sir dyng Phan trinh bdy ket qud thyc nghi?m vd nhO'ng phan tfch kit ludn cua chiing tdi dp dyng phuong phdp Viola-Jones mdi trudng Idp hpc Kel lugn vd hudng nghien ciru tiep Iheo dugc trlnh bay Irong phan DE XUAT GIAI PHAP GlAl QUYET BAI TOAN THONG KE SO LUONG SINH VIEN DU LCJP Hinh Id so md td gidi phdp md chiing tdi dc xuat Dudi day Id md td chi liet tirng budc so do: Thu Ihgp dnh du li^u l&p hgc: Thay vi tryc tiep dem so lupng sinh vien tren ldp nhu cdch lam truyen thong, chimg tdi dc xuat hai each Idm tiiy theo diiu ki?n co sd vat chit noi dp dung Cach 1: Nhdn vien thu Ihgp dU li?u sir dyng mdy dnh ky thugt sd de chyp dnh Idp hpc Vdi cdng nghe hien nay, cd nhung loai mdy anh cd gdc chup rdng cho phep thu dugc anh chira loan bd sinh vien tir cira Idp Dir lieu anh thu dugc Id dau vao cho budc ly dgng phat hipn khudn mat va hieu chinh kit qua Uu diim cua each Idm so vdi each Iam truyen thdng la khdng Idm mil nhiiu thdi gian, hgn che den muc thip nhal Idm gidn doan vi?c day va hpc Cdch 2: Sii dung he thong camera gdn lgi cdc phdng hpc Vi^c sir dyng camera de thu thgp anh diJ lieu se mang Igi hi?u qua cao hon DO' lieu dnh dugc thu nhgn liic thdi tai thdi diem mong mudn cac liet hgc dang dien thdng qua he thong mgng Cdch Idm khdng Idm anh hudng den gid hgc Trong trudng hgp ndy, can trang bj h? thdng camera nhung bil lai khdng can nhan vien di chyp anh, xa ly phdl hi^n khuon mdt: Sau da cd diJ lieu dnh Idp hpc, h? Ihong se nhgn anh dau vdo vd tu dpng phdt hipn khudn mdt Budc dugc thuc hien bdi mpt chiic ndng chuong trinh phan mem se dupe xay dyng Ket qud dnh ddu dugc hien thj vdi cdc viing dupe ddnh diu dupe cho Id khudn mdt (cd the diing hogc sai) Nhu da phan lich phan 1, chiing ldi di xuit sii dyng phuong phdp Viola-Jones cho chiic nang 104 Hinh \ Md hinh hogt dgng ciia hi thdng thong ki sd lugng sinh viin du lap su dung phuang phdp phdt hiin khudn mgt Hi^u chinh kit qud phdl hi^n khuon mgt: Anh dau vdo thu nhgn mdi trudng thyc te cd nhieu yeu to phiirc tgp nhu tu the ngdi ciia sinh vien khac (hudng cua khudn mat ngudi trudc ngdi lip mgt ngudisau ) Chiic nang lu dong phat hign khudn mat cd the thyc hi^n khdng chinh xdc, nham hodc bd sdt Hien nay, chua cd phuong phdp phdl hien khuon mgt dugc diing 100% Chiic nang hieu chinh ket qud ty dgng phdt hi?n khudn mat dugc Ihyc hi?n bdi ngudi qudn ly chuong trinh mpt cdch de dang, nhanh chdng vdi cac thao tac click chgn tren anh Ltru trir so lugng sinh vien d\t Idp: Sau ngudi quan ly hi^u chinh Igi kel qua ciia viec phat hi?n khudn m^t de thu dugc ket qua chinh Kdc, so ligu dugc td chirc luu tri? CO sd dii Ii?u dugc thiit ke hgp ly va c6 the phoi hgp vdi cdc he thong khac lien quan NhO'ng vj tri khudn mdt tren anh cung dugc luu tru" Tat ca cac thdng tin cd thi dugc hien thj, hi^u chinh, khai thdc tuong lai .Xir ly, phan lich thong ke so lugng sinh vien d{r lap: Tiiy theo nhu cau, cac chirc nang thong ke, phan lich, bao cdo se dugc trang bj chuong trinh Day Id viec Iam mang linh chuyen mon phyc vy cho tiiy timg myc Nguyen Thj Thanh TSm vd Dig Tgp chf KHOA HQC & CONG NGH$ dich cua viec thdng ke sd lugng hgc sinh, sinh vien Ngoai ra, cdc ket qud, s6 li^u cd the dugc sir dung d nhiSu cdng vi?c khdc tiip theo, PHUONG P H A P VIOLA -JONES Nam 2001, Paul Viola va cOng sy cdng bo mpt phuong phap phdt hien ddi tugng theo hudng tiep can hgc may sii dyng Boosted Cascade cua cdc dac trung Haar-like [S] Phuong phdp ban dau nhim myc dfch gidi quyil bai toan phdl hi8n khudn mgt Phuong phdp kit hgp nhiiu bp phan Idp mgt ciu tnic Cascade, Hinh Mdi mil cita ciu true Cascade Id mpt bg phan ldp day, bp phan ldp thyc hign phan m