Help me to do this "IMAQ"-2 image file attached

Dear friends
In this i attach my image file in Tif format & jpeg format
Please go through this vi
this vi it will display a image window when u click inside that window a square box will create, where ever u click it will create multiple box. i used imaq windraw function, u can see another image window in the front pannel also.
now my aim is to put a box over that spot with the spot as center and to extract the pixel values of the individual boxes,
now whats happening is when i run this program a image window is opening from the imaq windraw function in that 1ly i can able to put multiple box but that box is displayed in the image display in the front pannel also. but i cant put the box in the image window in the front pannel. if u click the mouse in the image window in the front pannel it will display the 25x25pixel values.
i want both to be done in a same window i want to put a multiple square box and the pixel values i want to extract seperately for the individual boxes. please help me give some ideas how to do this please modify this vi.
thank u
sasi
Attachments:
1.zip ‏279 KB

Sasi,
I am a little confused on what exactly you want to do and why you are using both WinDraw and an Image Display Control to show the image. It sounds like what you want to be able to do are the following 3 things:
1) Display the Image
2) Click on the image and have a rectangle overlay appear on image
3) Get the pixel values from that rectangle into an array
If I am understanding you correctly, then you should only display the image using one of the above display methods and have only a signal case structure in your code that adds the overlay to the image AND extracts the pixel values. I am a little unclear as to why you have decided to only get the pixel values if the user clicks on the Image Display and only draw the rectangle if the user clicks on the WinDraw display.
I have attached an image of a block diagram, which is what I think that you are trying to do. In the block diagram you can see that I have combined everything into one case structure so that whenever a user clicks on the Image Display (no WinDraw) then I add a rectangle overlay to my image and also get the pixel values for that area. If you want to keep track of the pixel values for each rectangle then you could use a shift register and build up a 3-D array with all of this information ... or write the data to file ... or use another method to keep that data for future use.
Regards,
Michael
Applications Engineer
National Instruments

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Please go through this vi
this vi it will display a image window when u click inside that window a square box will create, where ever u click it will create multiple box. i used imaq windraw function, u can see another image window in the front pannel also.
now my aim is to put a box over that spot with the spot as center and to extract the pixel values of the individual boxes,
now whats happening is when i run this program a image window is opening from the imaq windraw function in that 1ly i can able to put multiple box but that box is displayed in the image display in the front pannel also. but i cant put the box in the image window in the front pannel. if u click the mouse in the image window in the front pannel it will display the 25x25pixel values.
i want both to be done in a same window i want to put a multiple square box and the pixel values i want to extract seperately for the individual boxes. please help me give some ideas how to do this please modify this vi.
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Attachments:
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colorHash = new IntHashtable();
int k = 0;
for(int l = 0; l < height; l++) {
for(int i1 = 0; i1 < width; i1++) {
int j1 = rgbPixels[l][i1];
boolean flag = j1 >>> 24 < 128;
if(flag)
if(i < 0) {
i = k;
j = j1;
} else
if(j1 != j)
rgbPixels[l][i1] = j1 = j;
GifEncoderHashitem gifencoderhashitem = (GifEncoderHashitem)colorHash.get(j1);
if(gifencoderhashitem == null) {
if(k >= 256)
throw new IOException("too many colors for a GIF");
gifencoderhashitem = new GifEncoderHashitem(j1, 1, k, flag);
k++;
colorHash.put(j1, gifencoderhashitem);
} else {
gifencoderhashitem.count++;
byte byte0;
if(k <= 2)
byte0 = 1;
else
if(k <= 4)
byte0 = 2;
else
if(k <= 16)
byte0 = 4;
else
byte0 = 8;
int k1 = 1 << byte0;
byte abyte0[] = new byte[k1];
byte abyte1[] = new byte[k1];
byte abyte2[] = new byte[k1];
for(Enumeration enumeration = colorHash.elements(); enumeration.hasMoreElements();) {
GifEncoderHashitem gifencoderhashitem1 = (GifEncoderHashitem)enumeration.nextElement();
abyte0[gifencoderhashitem1.index] = (byte)(gifencoderhashitem1.rgb >> 16 & 0xff);
abyte1[gifencoderhashitem1.index] = (byte)(gifencoderhashitem1.rgb >> 8 & 0xff);
abyte2[gifencoderhashitem1.index] = (byte)(gifencoderhashitem1.rgb & 0xff);
GIFEncode(super.out, width, height, interlace, (byte)0, i, byte0, abyte0, abyte1, abyte2);
byte GetPixel(int i, int j) throws IOException {
GifEncoderHashitem gifencoderhashitem = (GifEncoderHashitem)colorHash.get(rgbPixels[j][i]);
if(gifencoderhashitem == null)
throw new IOException("color not found");
else
return (byte)gifencoderhashitem.index;
static void writeString(OutputStream outputstream, String s) throws IOException {
byte abyte0[] = s.getBytes();
outputstream.write(abyte0);
void GIFEncode(OutputStream outputstream, int i, int j, boolean flag, byte byte0, int k, int l,
byte abyte0[], byte abyte1[], byte abyte2[]) throws IOException {
Width = i;
Height = j;
Interlace = flag;
int k1 = 1 << l;
int j1;
int i1 = j1 = 0;
CountDown = i * j;
Pass = 0;
int l1;
if(l <= 1)
l1 = 2;
else
l1 = l;
curx = 0;
cury = 0;
writeString(outputstream, "GIF89a");
Putword(i, outputstream);
Putword(j, outputstream);
char c = '\uFF80';
c |= 'p';
c |= (byte)(l - 1);
Putbyte((byte)c, outputstream);
Putbyte(byte0, outputstream);
Putbyte((byte)0, outputstream);
for(int i2 = 0; i2 < k1; i2++) {
Putbyte(abyte0[i2], outputstream);
Putbyte(abyte1[i2], outputstream);
Putbyte(abyte2[i2], outputstream);
if(k != -1) {
Putbyte((byte)33, outputstream);
Putbyte((byte)-7, outputstream);
Putbyte((byte)4, outputstream);
Putbyte((byte)1, outputstream);
Putbyte((byte)0, outputstream);
Putbyte((byte)0, outputstream);
Putbyte((byte)k, outputstream);
Putbyte((byte)0, outputstream);
Putbyte((byte)44, outputstream);
Putword(i1, outputstream);
Putword(j1, outputstream);
Putword(i, outputstream);
Putword(j, outputstream);
if(flag)
Putbyte((byte)64, outputstream);
else
Putbyte((byte)0, outputstream);
Putbyte((byte)l1, outputstream);
compress(l1 + 1, outputstream);
Putbyte((byte)0, outputstream);
Putbyte((byte)59, outputstream);
void BumpPixel() {
curx++;
if(curx == Width) {
curx = 0;
if(!Interlace) {
cury++;
return;
switch(Pass) {
default:
break;
case 0: // '\0'
cury += 8;
if(cury >= Height) {
Pass++;
cury = 4;
return;
break;
case 1: // '\001'
cury += 8;
if(cury >= Height) {
Pass++;
cury = 2;
return;
break;
case 2: // '\002'
cury += 4;
if(cury >= Height) {
Pass++;
cury = 1;
return;
break;
case 3: // '\003'
cury += 2;
return;
int GIFNextPixel() throws IOException {
if(CountDown == 0) {
return -1;
} else {
CountDown--;
byte byte0 = GetPixel(curx, cury);
BumpPixel();
return byte0 & 0xff;
void Putword(int i, OutputStream outputstream) throws IOException {
Putbyte((byte)(i & 0xff), outputstream);
Putbyte((byte)(i >> 8 & 0xff), outputstream);
void Putbyte(byte byte0, OutputStream outputstream) throws IOException {
outputstream.write(byte0);
final int MAXCODE(int i) {
return (1 << i) - 1;
void compress(int i, OutputStream outputstream) throws IOException {
g_init_bits = i;
clear_flg = false;
n_bits = g_init_bits;
maxcode = MAXCODE(n_bits);
ClearCode = 1 << i - 1;
EOFCode = ClearCode + 1;
free_ent = ClearCode + 2;
char_init();
int j1 = GIFNextPixel();
int i2 = 0;
for(int j = hsize; j < 0x10000; j *= 2)
i2++;
i2 = 8 - i2;
int l1 = hsize;
cl_hash(l1);
output(ClearCode, outputstream);
int i1;
label0:
while((i1 = GIFNextPixel()) != -1) {
int k = (i1 << maxbits) + j1;
int l = i1 << i2 ^ j1;
if(htab[l] == k) {
j1 = codetab[l];
continue;
if(htab[l] >= 0) {
int k1 = l1 - l;
if(l == 0)
k1 = 1;
do {
if((l -= k1) < 0)
l += l1;
if(htab[l] == k) {
j1 = codetab[l];
continue label0;
} while(htab[l] >= 0);
output(j1, outputstream);
j1 = i1;
if(free_ent < maxmaxcode) {
codetab[l] = free_ent++;
htab[l] = k;
} else {
cl_block(outputstream);
output(j1, outputstream);
output(EOFCode, outputstream);
void output(int i, OutputStream outputstream) throws IOException {
cur_accum &= masks[cur_bits];
if(cur_bits > 0)
cur_accum |= i << cur_bits;
else
cur_accum = i;
for(cur_bits += n_bits; cur_bits >= 8; cur_bits -= 8) {
char_out((byte)(cur_accum & 0xff), outputstream);
cur_accum >>= 8;
if(free_ent > maxcode || clear_flg)
if(clear_flg) {
maxcode = MAXCODE(n_bits = g_init_bits);
clear_flg = false;
} else {
n_bits++;
if(n_bits == maxbits)
maxcode = maxmaxcode;
else
maxcode = MAXCODE(n_bits);
if(i == EOFCode) {
for(; cur_bits > 0; cur_bits -= 8) {
char_out((byte)(cur_accum & 0xff), outputstream);
cur_accum >>= 8;
flush_char(outputstream);
void cl_block(OutputStream outputstream) throws IOException {
cl_hash(hsize);
free_ent = ClearCode + 2;
clear_flg = true;
output(ClearCode, outputstream);
void cl_hash(int i) {
for(int j = 0; j < i; j++)
htab[j] = -1;
void char_init() {
a_count = 0;
void char_out(byte byte0, OutputStream outputstream) throws IOException {
accum[a_count++] = byte0;
if(a_count >= 254)
flush_char(outputstream);
void flush_char(OutputStream outputstream) throws IOException {
if(a_count > 0) {
outputstream.write(a_count);
outputstream.write(accum, 0, a_count);
a_count = 0;
private boolean interlace;
int width;
int height;
int rgbPixels[][];
IntHashtable colorHash;
int Width;
int Height;
boolean Interlace;
int curx;
int cury;
int CountDown;
int Pass;
static final int EOF = -1;
static final int BITS = 12;
static final int HSIZE = 5003;
int n_bits;
int maxbits;
int maxcode;
int maxmaxcode;
int htab[];
int codetab[];
int hsize;
int free_ent;
boolean clear_flg;
int g_init_bits;
int ClearCode;
int EOFCode;
int cur_accum;
int cur_bits;
int masks[] = {
0, 1, 3, 7, 15, 31, 63, 127, 255, 511,
1023, 2047, 4095, 8191, 16383, 32767, 65535
int a_count;
byte accum[];

How come 5.0 can't open local desktop images files (.jpg, .tif, .png ...) on my Mac anymore?

I'm using Mac 10.6.8 and the newest version of Firefox 5.0. I have always been able to select File > Open File from the Firefox menu and select any image file on my computer and view it in the browser window. Suddenly I can't do this. All image files on my system are greyed out and not accessible. I can open html files from my local desktop and all images are present but can't open any .css files or single image files.

Here's the *.tiff file.
I've had to switch browser to Safari, as you can't load a tiff in Firefox, either.

Locked Image Files - Adam#1

Here's the situation....
Creating an iWeb site using the Gazette template for my college website. Everything is great until I want to change a published site on the college's non-Mac server. I can publish to my folder on the server great, but when I try to update the folder it tells me I don't have permission to trash the COLUMN DIVIDER image file in the IMAGE FOLDER. That's the only file I can't update on this PC Server.
So everytime I want to publish again...I publish to my SITE USER folder....open up my folder on the non-pc server.....physcially trash everything but the COLUMN DIVIDER file, and then copy everything around that file.....
It works dandy, but annoying...
Any problems with that COLUMN DIVIDER creating a locked file...which it doesn't look like in the Info box?
Any suggestions?
Thanks,
Adam

Hi Adam...
Another workaround that might make your site updating life easier is to use an FTP program like Captain FTP ( http://captainftp.xdsnet.de/ ) that actually has a syncronizing function built in to the upload function. This will allow you to upload only the files that have changed in your sitefolder. And since this "column divider" image file seems to be a template file, it will always be present in your sitefolder. So once it is uploaded, it is there for good...no need to delete and upload another copy, etc.
Lots of people around here using Captain FTP for its sync function. For iWeb, I believe there is a setting that you need to disable....do a search in this forum...I think it is syncronize by date or something like that.

Are the image files on a Time Machine backup password protected?

I have had a hard drive hooked up to my AirPort Express, backing up my computers to it using Time Machine.
Now, the hard drive is broken and I have to return it to the dealer to have it replaced as it is still covered by their warranty.
My question is, will they be able to access my personal data?
I have to enter a password to access the disk over the network, does this mean the image files on it are also password protected?
I know it's not very likely they have any interest in browsing my files, but I don't like the idea to just give everything away.
The disk won't spin so I can't format the drive.

TZW wrote:
I have had a hard drive hooked up to my AirPort Express, backing up my computers to it using Time Machine.
Now, the hard drive is broken and I have to return it to the dealer to have it replaced as it is still covered by their warranty.
My question is, will they be able to access my personal data?
I have to enter a password to access the disk over the network, does this mean the image files on it are also password protected?
I know it's not very likely they have any interest in browsing my files, but I don't like the idea to just give everything away.
The disk won't spin so I can't format the drive.
If the disk isn't spinning it is unlikely to be repaired.. And if you passworded the disk people would need the password to access although given time all those things can be broken.. I would say you have little to fear.

Do IMAQ Cast Image or IMAQ Linear averages give different results when using different computers that are running under Windows XP ?

Hello
I'm currently developping an image processing algorithm using Labview 7.1 and the associated IMAQ Vision tools. After several tests, I found a weird result. Indeed, I put the labview algorithm - including the IMAQ VI on the library to get sure that I use all the time the same VI - on my memory stick and used it on two different computers. I tested the same picture (still in my memory stick) and had two very different results.
After several hours trying to understand why, I found that there were a difference between the results given by both computers at the very begining of the algorithm. Indeed, I used a JPEG file.
To open it, I first create an Image with IMAQ Create (U8). Then, I open it.
Then in my first sub-VI, I use IMAQ Cast Image to be sure that the picture is a U8 grayscale picture.
Right after that, I use the IMAQ Linear Averages. The results of this VI are different on the two computers.
I tried several time on the same picture : one computer always give me the same result but the two computers give me a different result. So there is no random variable on the results.
So my question is : Do IMAQ Cast Image or IMAQ Linear averages give different results when using different computers that are running under Windows XP ?
My bet is on IMAQ Cast Image but I'm not quite sure and I do not undestand why. The labview and IMAQ are the same on both computers.
The difference between the two computer are above :
Computer 1 :
Pentium(R) 4 CPU 3.20GHz with a RAM of 1Go. The processor is an Intel(R).
The OS is windows XP Pro 2002
Computer 2 :
Pentium(R) 4 CPU 2.80GHz with a RAM of 512Mo. The processor is an Intel(R).
The OS is windows XP Pro 2002.
If anybody can help me on this problem, it would be really helpful.
Regards
Florence P.

Hi,
Indeed it's a strange behaviour, could you send me your VI and your JPEG file, (or another file that reproduces) so that I could check this inthere ?
I'll then try to find out what's happening.
Regards
Richard Keromen
National Instruments France
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>> Découvrez, en vidéo, les innovations technologiques réalisées en éco-conception

What does the IMAQ Cast Image VI do exactly?

Hi everyone,
I want to convert a RGB image to grayscale. By now I can do this, using the IMAQ Cast Image VI. But now I was wondering what exacly does this VI do? How does it make a grayscale image from the RGB image? What is happening under the hood?
Hope someone can tell me, since I really can't find it. Thanks in advance ^^.
Solved!
Go to Solution.

For each type conversion there is specific operation. In your case The VI sets the destination value to the average of the three color components of the source.
For more:
http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/casting_images/
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

Error -1074396120 IMAQ Get Image Info Error "Not an image"

Hello everyone,
I'm currently working on Machine Vision project. It has to measure distance of small metal elements, which moves on a conveyor. I've built and tested measurement algorithm in NI Vision Builder and it worked really cool. Today I tried to migrate inspection to LabVIEW in order to add features connected with sensors which I use in my project. When migration completed I run a VI, and suddenly got error:
Error -1074396120 occured at IMAQ Get Image Info
Not an image.
I use in my project Logitech Pro 9000, and I can see it in MAX. I acquire image in 640x480 resolution as RGB2. I read somewhere that it could be caused by RGB colors of image. In my algorithm after acquiring image is thresholded in order to get binary image.
Please tell me which block diagrams should I attach to this post to make it more understandable for you (if it is needed). Is it possible to fix this error ? Did anyone sorted it out already ? Thanks for any help.
Best regards,
Michael

First of all I would like to apologize for long delay in replying and thank you for your replies.
@toto26:
Yes, I used before threshold function a function you mentioned. The problem is that my algorithm works correctly in Vision Builder, but after migrating to LabVIEW, when I run a VI it doesn't work. It's strange for me.
The problem also occurs when I made my algorithm as simple as possible - now it includes two steps: acquisition and find edge function. After migration it still cannot acquire an image. Below I present an error and a place where it occurs (process ID already in use):
I think that it would be easier and faster when I understand IMAQ functions. I want to build my algorithm from the beginning in LabVIEW, because I would be aware of every part of my program. Please tell me if it is possible with my camera. Could you suggest me where can I find information about building vision application in LabVIEW for beginners. What keywords should I look for.
Thanks for any advice,
Michael

Help me to do this "IMAQ"-2 image file attached

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