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Giup em voi!!

 
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thanhpfiev02



Joined: 27 Sep 2006
Posts: 3
PostPosted: Wed Sep 27, 2006 3:35 am    Post subject: Giup em voi!! Reply with quote
Em dang tap tach buoc vao linh vuc xu li anh. Em dang lam mot project xu li anh ma khong tim duoc cau truc file anh jpg nhu the nao.Em co search tren net roi nhung khong tim thay gi phu hop.
Cac anh chi xa gan co the giup em duoc khong?
Chan thanh cam on nhe! Very Happy
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azerty



Joined: 27 Sep 2006
Posts: 1
Location: USA
PostPosted: Wed Sep 27, 2006 6:49 pm    Post subject: Re: Giup em voi!! Reply with quote
thanhpfiev02 wrote:
Em dang tap tach buoc vao linh vuc xu li anh. Em dang lam mot project xu li anh ma khong tim duoc cau truc file anh jpg nhu the nao.Em co search tren net roi nhung khong tim thay gi phu hop.
Cac anh chi xa gan co the giup em duoc khong?
Chan thanh cam on nhe! Very Happy


Em co the dung lenh imread va imwrite de doc va viet jpg file thanh ma tran trong Matlab. Em help imread va help imwrite de biet them chi tiet.

Khong biet anh co tra loi dung cau hoi cua em khong?
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diec



Joined: 16 Sep 2006
Posts: 17
PostPosted: Wed Sep 27, 2006 9:33 pm    Post subject: Reply with quote
Em co the tim hieu ve JPEG tai http://www.code.ucsd.edu/~pcosman/253jpeg05.pdf
Cau truc cua JPEG tai http://www.jpeg.org/public/jfif.pdf
Chuc em ne'n tot Wink
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thanhpfiev02



Joined: 27 Sep 2006
Posts: 3
PostPosted: Thu Sep 28, 2006 3:48 am    Post subject: Reply with quote
Em cam on cac anh chi rat nhieu.
Em muon hoi them co phai khi muon xu li cac anh ,vi du nhu loc, nen, zoom,... nguoi ta thuong chuyen tat ca cac file anh ve dinh dang bmp de thuc hien?
Em dang lam loc anh(VC++6.0), lam bmp duoc roi, muon lam them cac dang khac nhung thac mac vay nen moi nho anh chi giup dum! Very Happy
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diec



Joined: 16 Sep 2006
Posts: 17
PostPosted: Thu Oct 05, 2006 6:56 pm    Post subject: Reply with quote
Chao em,
Lam duoc voi bmp thi coi nhu la tat ca roi Wink Doi hoi chi nua nhi Very Happy
Tat ca cac dinh dang khac deu co the chuyen doi qua lai voi nhau, dieu quan trong la chat luong anh co bi suy giam hay khong (chac chan la khi chuyen dinh dang goc sang mot dinh dang khac, chi co giam chat luong ma thoi, may man thi bao toan chat luong) Crying or Very sad
Mot so luu y:
+ Tot nhat la phai dam bao anh goc la anh original (chua bi nen, chua bi xu ly gi ca, mot so file anh bmp cung chua dam bao la no la anh goc (lo nguoi ta da chuyen tu jpg sang bmp thi sao nhi Wink) Neu dung anh da bi xu ly de lam anh goc thi hau qua kho luong lam Wink
+ Khi luu anh (dung imwrite) thi gia tri cua pixel se bi lam tron (round) nen vi vay tinh PSNR tren bien truoc khi luu anh, neu thuc hien tinh PSNR sau khi luu anh (imwrite, then imread to get the pixel matrix) thi di nhien se khong dung.
+ Khi insert mot buc anh vao document (Ms word or Latex), phai dam bao la anh con y nguyen chat luong (hihi, mot so phan mem se du dong nen cac anh duoc insert duoi dang jpeg day).
+ Insert xong roi, nhung chua het dau kho. Phai in ra thu, doi khi nhin tren monitor thi rat tot, nhung ma in ra thi improvement cua anh khong the hien duoc, the thi may Prof. tuong minh gian lan thi chet Wink
+ Van chua het, khi dem di bao ve (presentation), phai test truoc de xem thang projector co xin khong, vi doi khi chieu len, khong thay duoc improvement cua anh minh da xu ly dau. (luc do chi con cach bung cai monitor cho cac prof trong committee xem thoi) Laughing
+ Enhancement theo yeu cau phai co PSNR>0.5 dB de nhin duoc bang mat thuong. Hi hi, nhung ma dieu nay doi khi khong dung cho moi truong hop. PSNR lon chua chac la tot, vi cuoi cung visual quality nhan duoc boi mat tran moi la quan trong.
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audiodsp



Joined: 15 Nov 2006
Posts: 19
PostPosted: Fri Jan 25, 2008 3:23 am    Post subject: Reply with quote
Can someone please translate this. I will even pay someone to do it. This is valuable info that we can't read.

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