C / C++ / MFC

2-Aug-09 22:22

Hi all,

Anyone has the C source code for Sobel - edge detection filter for bitmap color image.

Pls support me the complete souce code.

HimanshuJoshi2-Aug-09 22:47

HimanshuJoshi

2-Aug-09 22:47

Google[^] gave me This[^]. What did it gave to you?

adichavan2-Aug-09 23:16

2-Aug-09 23:16

thanx but i wana code in c not in cpp.

Michael Schubert2-Aug-09 23:57

Michael Schubert

2-Aug-09 23:57

adichavan wrote:
i wana code

if youz wana code youz gonna have to writez it or search for itz...

Chandrasekharan P3-Aug-09 0:05

Chandrasekharan P

3-Aug-09 0:05

adichavan wrote:
i wana code

Go Ahead!!!! who is stopping you..

adichavan3-Aug-09 1:39

3-Aug-09 1:39

i had write code in c i m new in image processing i stard studing it since last 1 month uptil now i read my image its header i displayed it & perform convlution with sobel operater the code is running but cant show the complit o/p if u dont want to help then live it OK i just want to compaire my code with other & dat cpp code i allready studied

adichavan3-Aug-09 1:42

3-Aug-09 1:42

rather i rhink u dont know anythink about image processing

Chandrasekharan P3-Aug-09 2:02

Chandrasekharan P

3-Aug-09 2:02

There are 4,820,000 results when you google your subject. If you need more help i can give you a link have a look at it. [^]

Which way should I select when save image from browser

CPallini3-Aug-09 0:37

CPallini

3-Aug-09 0:37

Then remove the unwanted pp and go on... Roll eyes | :rolleyes:

You know C++ code maybe converted into C one.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

shi baoshi2-Aug-09 22:02

Re: Which way should I select when save image from browser

2-Aug-09 22:02

I want to develop a tool .The function is when I drag a image from browser on it which can save image to my desktop or manger(rename ) the image.

with google and other's help,I gain the HGLOBAL data from clipboard with pDataObject->GetGlobalData (CF_DIB) and I also can get the URL of image.but when I want to save this image to my desktop and I find two way can do this:

1.Save the data of CF_DIB format
The problem is:
I gain a string of binary system from CF_DIB data, how can i save it as image without changed it? I try to save all of those image to my desktop as format of bmp,it's can do the work but seem not good for the image on the desktop often larger then the browser.so I think it's not a good mothod to do this.for I have to save file without change I should save the format of image sam as browsers' ,but with many format like gif,jpg and so on....so I want to find a easy way how can I save image without changed it.

2. Download the image
The problem is:
Many URL is not right which can not find the image correctly,may be need parse it.

So The last questions is which way should I select can better solve my problem ?

Thanks in advance for your help and sorry for my English.
notenking

Code-o-mat3-Aug-09 0:29

Re: Which way should I select when save image from browser [modified]

3-Aug-09 0:29

For your first solution i would check out CxImage[^].
For your second i would try using WinInet[^].

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

shi baoshi3-Aug-09 16:15

Re: Which way should I select when save image from browser

3-Aug-09 16:15

Thanks Code-o-mat.
I try to use CxImage before ask this question and find it's not a best solution when drag a picture from browser ,since the size of image may be changed ,So I want to know it's really need I do like this? any other easy way can I do?

Best Regards
notenking

modified on Tuesday, August 4, 2009 12:11 AM

Code-o-mat3-Aug-09 21:06

Re: Which way should I select when save image from browser

3-Aug-09 21:06

How do you mean "the size of image may be changed"? You could try using GDI+[^] too, and how about the second options, downloading the original image?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

shi baoshi3-Aug-09 21:45

Re: Which way should I select when save image from browser

3-Aug-09 21:45

"the size of image may be changed" :
For example,when i save a image which is bmp format,and I use a method like this

HGLOBAL hg = pDataObject->GetGlobalData (CF_DIB);

CFile file;
file.Open(_T(deskpath+"//"+"temp.bmp"),CFile::modeCreate|CFile::modeWrite);
SaveToFile(hg,file);
file.Close();

when I get the image and find it larger than the original image,I thinks the reason may be for the way I save.and also I should save different format with differ method. so i thinks when I save a image with my method and I with changed it.but I don't want to change it,However ,I do not know what's should I do? use other libary like CxImage can solve this?

"download the original image": I can gain the url of the image ,so I think if I can not get the original image with the first solution and I can download it. but....It's also seem not easy for some of URL is not correct,may be need prase to get the true URL.

So I feel confused which is the easy way to get the correct image?

notenking

Code-o-mat3-Aug-09 22:43

Re: Which way should I select when save image from browser

3-Aug-09 22:43

Well, one way you could go is to use CreateDIBSection[^] using the BITMAPINFO[^] structure and the pixel data you get with CF_DIB[^]. Once you have a HBITMAP handle you can use CxImage's CreateFromHBITMAP and then CxImage's Save methods to save your image in any format you like. There are probably more efficient ways but this is the first one i could think of.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

shi baoshi3-Aug-09 23:09

Re: Which way should I select when save image from browser [modified]

3-Aug-09 23:09

Yes，Code-o-mat Thank you,It's a way to solve it.I'll try later.

and I also want to know did the size of image will be changed do like this ? Frown | :(

Code-o-mat3-Aug-09 23:16

Re: Which way should I select when save image from browser

3-Aug-09 23:16

I doubt it but to tell you the truth i still don't quite understand how you mean that the image size changes... do you mean that for example you drag a 800x600 image on your application and it saves a smaller, let's say 400x300 pixels image? Are you sure that in the drag operation you get the original image as a DIB and not some scaled-down preview? Also, if you have a site with small images as links to their big versions, then dragging the image will surely contain the original, small image's URL, not the bigger version's.

[EDIT] You mean the filesize, don't you? The file you save is smaller than the file in your browser's cache, right? Well, did you try opening the BMPs you saved? Does for example Paint open them OK? If you simply take the CF_DIB data and just write it to a file that shouldn't actually produce a valid Bitmap since Bitmaps have to begin with a BITMAPFILEHEADER[^] structure and CF_DIB does not contain that. Could this be what you mean?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

modified on Tuesday, August 4, 2009 5:22 AM

shi baoshi4-Aug-09 4:47

Re: Which way should I select when save image from browser

4-Aug-09 4:47

Yes,Code-o-mat,Sorry for my English,It's filesize changed Smile | :)

,but it become larger than the orignial.
actually ,I want to know how can I get the image without CF_DIB data ,if I have to take CF_DIB data without any select,can the image be saved as cache?

Thanks Code-o-mat for your patient.
notenking

Code-o-mat4-Aug-09 6:14

Re: Which way should I select when save image from browser

4-Aug-09 6:14

If you drag a JPG or PNG image (since BMP formats are rarely used on websites i supose you are experimenting with those) and then save it as a BMP (from the CF_DIB) then it is no wonder the file size is bigger since JPG and PNG are compressed while the BMP (from the DIB) is not. When you save the DIB data to file you are actually not getting the very same file your browser downloaded (maybe unless it originally was a BMP) but you convert the image from JPG or PNG to uncompressed Windows Bitmap format, thus the filesize will be bigger. If you are using the CxImage aproach you are still not saving the very original file but what you are doing -in case of a JPG for example- is to let the browser decompress the JPG and store the pixel data into a DIB and then re-compressing that DIB back into a JPG again and saving that to file and nothing garantees that you will receive a "perfect copy" of the original JPG image.

shi baoshi wrote:
I want to know how can I get the image without CF_DIB data ,if I have to take CF_DIB data without any select,can the image be saved as cache?

I'm not sure i understand what you mean here but i guess what you want is to get the image from the browser's cache and copy it to wherever. I currently have no idea how you could figure out where the browser cached the image, but imho relying on that is not necesarily a good idea. I'm not sure how IE or any other browser handles caching but what if for example caching is turned off by the user completely? Could be that the browser does not save the image to any local file but only stores it in memory. I'd say if you want the very original file as it is, your best bet is still downloading it yourself again, i think using WinInet could be much of a help to you with that. You said that you tried the download aproach already but there were problems with the URLs. What problems? Could these maybe handled by Wininet's InternetOpenURL[^] function?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

shi baoshi4-Aug-09 16:04