Converting byte array of 16 grey degrees into 256-grey-degree format
i am trying to get image from fingerprint scanner through c# application, but when transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred (that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the transferring.
So converting that byte stream back to image i am using following code:-
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
pictureBox2.Image = returnImage;
But it is giving me error as
"Parameter not valid"
for :
Image returnImage = Image.FromStream(ms);
I am getting around 500 bytes of data. Could any one please provide any solution so that image when uploaded to PC, the 16-grey-degree image can be extended to 256-grey-degree format i.e. 8-bit BMP format.
c#
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
add a comment |
i am trying to get image from fingerprint scanner through c# application, but when transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred (that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the transferring.
So converting that byte stream back to image i am using following code:-
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
pictureBox2.Image = returnImage;
But it is giving me error as
"Parameter not valid"
for :
Image returnImage = Image.FromStream(ms);
I am getting around 500 bytes of data. Could any one please provide any solution so that image when uploaded to PC, the 16-grey-degree image can be extended to 256-grey-degree format i.e. 8-bit BMP format.
c#
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Image.FromStreamor one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into aImageobject is another. Which one do you require help with? Both?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10
add a comment |
i am trying to get image from fingerprint scanner through c# application, but when transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred (that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the transferring.
So converting that byte stream back to image i am using following code:-
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
pictureBox2.Image = returnImage;
But it is giving me error as
"Parameter not valid"
for :
Image returnImage = Image.FromStream(ms);
I am getting around 500 bytes of data. Could any one please provide any solution so that image when uploaded to PC, the 16-grey-degree image can be extended to 256-grey-degree format i.e. 8-bit BMP format.
c#
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
i am trying to get image from fingerprint scanner through c# application, but when transferring through UART, to quicken speed, only the upper 4 bits of the pixel is transferred (that is 16 grey degrees). And two adjacent pixels of the same row will form a byte before the transferring.
So converting that byte stream back to image i am using following code:-
MemoryStream ms = new MemoryStream(byteArrayIn);
Image returnImage = Image.FromStream(ms);
pictureBox2.Image = returnImage;
But it is giving me error as
"Parameter not valid"
for :
Image returnImage = Image.FromStream(ms);
I am getting around 500 bytes of data. Could any one please provide any solution so that image when uploaded to PC, the 16-grey-degree image can be extended to 256-grey-degree format i.e. 8-bit BMP format.
c#
c#
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
edited Aug 6 '13 at 9:06
Soner Gönül
80.4k27148276
80.4k27148276
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
asked Aug 6 '13 at 9:05
sami manchndasami manchnda
16112
16112
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Image.FromStreamor one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into aImageobject is another. Which one do you require help with? Both?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10
add a comment |
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Image.FromStreamor one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into aImageobject is another. Which one do you require help with? Both?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Image.FromStream or one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into a Image object is another. Which one do you require help with? Both?– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Image.FromStream or one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into a Image object is another. Which one do you require help with? Both?– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10
add a comment |
1 Answer
1
active
oldest
votes
You could transform the nibbles into bytes and then use the transformed data, like so:
public byte NibblesToBytes(byte data)
{
byte result = new byte[data.Length*2];
int i = 0;
foreach (var bits in data)
{
// You may need to reverse these two lines, depending on data format:
result[i++] = (byte)((bits & 0x0F) << 4);
result[i++] = (byte)(bits & 0xF0);
}
return result;
}
Those bytes will be greyscale values. To convert each value to an RGB value, you would need to set each of the R, G and B values to the greyscale value (I expect that you already know that, but I mention it just in case).
But you will need to do more than just this. You will need header information and so on.
These threads might help with that:
Create Bitmap from a byte array of pixel data
Convert byte Array or File Storage to Bitmap Image
edited May 23 '17 at 12:11
Community♦
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f18075907%2fconverting-byte-array-of-16-grey-degrees-into-256-grey-degree-format%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You could transform the nibbles into bytes and then use the transformed data, like so:
public byte NibblesToBytes(byte data)
{
byte result = new byte[data.Length*2];
int i = 0;
foreach (var bits in data)
{
// You may need to reverse these two lines, depending on data format:
result[i++] = (byte)((bits & 0x0F) << 4);
result[i++] = (byte)(bits & 0xF0);
}
return result;
}
Those bytes will be greyscale values. To convert each value to an RGB value, you would need to set each of the R, G and B values to the greyscale value (I expect that you already know that, but I mention it just in case).
But you will need to do more than just this. You will need header information and so on.
These threads might help with that:
Create Bitmap from a byte array of pixel data
Convert byte Array or File Storage to Bitmap Image
edited May 23 '17 at 12:11
Community♦
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
add a comment |
You could transform the nibbles into bytes and then use the transformed data, like so:
public byte NibblesToBytes(byte data)
{
byte result = new byte[data.Length*2];
int i = 0;
foreach (var bits in data)
{
// You may need to reverse these two lines, depending on data format:
result[i++] = (byte)((bits & 0x0F) << 4);
result[i++] = (byte)(bits & 0xF0);
}
return result;
}
Those bytes will be greyscale values. To convert each value to an RGB value, you would need to set each of the R, G and B values to the greyscale value (I expect that you already know that, but I mention it just in case).
But you will need to do more than just this. You will need header information and so on.
These threads might help with that:
Create Bitmap from a byte array of pixel data
Convert byte Array or File Storage to Bitmap Image
edited May 23 '17 at 12:11
Community♦
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
add a comment |
You could transform the nibbles into bytes and then use the transformed data, like so:
public byte NibblesToBytes(byte data)
{
byte result = new byte[data.Length*2];
int i = 0;
foreach (var bits in data)
{
// You may need to reverse these two lines, depending on data format:
result[i++] = (byte)((bits & 0x0F) << 4);
result[i++] = (byte)(bits & 0xF0);
}
return result;
}
Those bytes will be greyscale values. To convert each value to an RGB value, you would need to set each of the R, G and B values to the greyscale value (I expect that you already know that, but I mention it just in case).
But you will need to do more than just this. You will need header information and so on.
These threads might help with that:
Create Bitmap from a byte array of pixel data
Convert byte Array or File Storage to Bitmap Image
edited May 23 '17 at 12:11
Community♦
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
You could transform the nibbles into bytes and then use the transformed data, like so:
public byte NibblesToBytes(byte data)
{
byte result = new byte[data.Length*2];
int i = 0;
foreach (var bits in data)
{
// You may need to reverse these two lines, depending on data format:
result[i++] = (byte)((bits & 0x0F) << 4);
result[i++] = (byte)(bits & 0xF0);
}
return result;
}
Those bytes will be greyscale values. To convert each value to an RGB value, you would need to set each of the R, G and B values to the greyscale value (I expect that you already know that, but I mention it just in case).
But you will need to do more than just this. You will need header information and so on.
These threads might help with that:
Create Bitmap from a byte array of pixel data
Convert byte Array or File Storage to Bitmap Image
edited May 23 '17 at 12:11
Community♦
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
edited May 23 '17 at 12:11
Community♦
11
edited May 23 '17 at 12:11
Community♦
11
edited May 23 '17 at 12:11
Community♦
11
11
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
answered Aug 6 '13 at 9:11
Matthew WatsonMatthew Watson
73k692178
73k692178
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
add a comment |
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
Thanks a lot for the help
– sami manchnda
Aug 6 '13 at 10:45
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f18075907%2fconverting-byte-array-of-16-grey-degrees-into-256-grey-degree-format%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Well what format is the data in?
– Jon Skeet
Aug 6 '13 at 9:07
Image.FromStreamor one of its siblings that deal with other sources actually expect a fully formatted image file, ie. a full Jpeg or PNG file, not just the raw pixel values. There's a lot more to an image file format than just the pixels. Now, decoding nibbles (4 bits) to bytes is one problem, but getting it into aImageobject is another. Which one do you require help with? Both?– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:09
Additionally, around 500 bytes of data, consisting of 2 4-bit nibbles each, translates to around 1000 pixels. How big is the image? 40*25?
– Lasse Vågsæther Karlsen
Aug 6 '13 at 9:10