I have an Image object which is a jpg picture taken by the camera and I need to create a Bitmap from it.
Is there any way to do it besides using BMPGenerator class? I'm working on a commercial project and I don't think I can use it due to the GPLv3 license.
So far this is the code I have. Can I do something with it?
FileConnection file = (FileConnection) Connector.open("file://" + imagePath, Connector.READ_WRITE);
InputStream is = file.openInputStream();
Image capturedImage = Image.createImage(is);
I tried this but I wasn't able to get the correct filepaht and the image is stuck in null
EncodedImage image = EncodedImage.getEncodedImageResource(filePath);
byte[] array = image.getData();
capturedBitmap = image.getBitmap();
You can use videoControl.getSnapshot(null) and then Bitmap myBitmap = Bitmap.createBitmapFromBytes(raw, 0, raw.length, 1) to get a bitmap from camera.
videoControl is got from player.getControl("VideoControl") and player is got from Manager.createPlayer()
By the way, what kind of Image do you have? If we are talking of EncodedImage, you can just use getBitmap() from it.
Fixed!
Well, almost.
Used the following method but the image is rotated 90 degrees.
Going to fix that with this
public Bitmap loadIconFromSDcard(String imgname){
FileConnection fcon = null;
Bitmap icon = null;
try {
fcon = (FileConnection)Connector.open(imgname, Connector.READ);
if(fcon.exists()) {
byte[] content = new byte[(int) fcon.fileSize()];
int readOffset = 0;
int readBytes = 0;
int bytesToRead = content.length - readOffset;
InputStream is = fcon.openInputStream();
while (bytesToRead > 0) {
readBytes = is.read(content, readOffset, bytesToRead);
if (readBytes < 0) {
break;
}
readOffset += readBytes;
bytesToRead -= readBytes;
}
is.close();
EncodedImage image = EncodedImage.createEncodedImage(content,0,content.length);
icon = image.getBitmap();
}
} catch (Exception e) {
}finally{
// Close the connections
try{ if(fcon != null) fcon.close(); }
catch(Exception e){}
}
return icon;
}
Related
I am trying to import video in javacv but cvCreateFileCapture("Filename") class is returning null value and I have also tried using OpenCVFrameGrabber("File name"), it is also not working properly.
Here is my code :
public class SmokeDetectionInStoredVideo {
private static final int IMG_SCALE = 2;
private static final int width = 640;
private static final int height = 480;
public static void main(String args[]){
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
CvMemStorage storage = CvMemStorage.create();
IplImage img1=null,imghsv=null,imgbin=null;
CvSeq contour1;
CvSeq contour2;
double areaMax = 00, areaC = 0.0;
imghsv = IplImage.create(width/IMG_SCALE, height/IMG_SCALE, 8, 3);
imgbin = IplImage.create(width/IMG_SCALE, height/IMG_SCALE, 8, 1);
try{
CvCapture capture = cvCreateFileCapture("Red.mp4");//cvCreateCameraCapture(0);
if(capture.isNull()){
System.out.println("Error reading file");
}
IplImage grabbedImage = cvQueryFrame(capture);
OpenCVFrameConverter.ToIplImage converter=new OpenCVFrameConverter.ToIplImage();
CanvasFrame canvasFrame = new CanvasFrame("Actual Video");
CanvasFrame canvasBinFrame = new CanvasFrame("Contour Video");
canvasFrame.setCanvasSize(grabbedImage.width(), grabbedImage.height());
canvasBinFrame.setCanvasSize(grabbedImage.width(), grabbedImage.height());
imghsv = IplImage.create(grabbedImage.width(), grabbedImage.height(), 8, 3);
imgbin = IplImage.create(grabbedImage.width(), grabbedImage.height(), 8, 1);
while (canvasFrame.isVisible() && (img1 = cvQueryFrame(capture)) != null) {
cvCvtColor(img1, imghsv, CV_RGB2HSV);
//canvasFrame.showImage(converter.convert(imghsv));
cvInRangeS(img1, cvScalar(220, 220, 220, 0), cvScalar(235, 235, 235, 0), imgbin);
contour1 = new CvSeq();
cvFindContours(imgbin, storage, contour1, Loader.sizeof(CvContour.class), CV_RETR_LIST, CV_LINK_RUNS);
contour2 = contour1;
while (contour1 != null && !contour1.isNull()) {
areaC = cvContourArea(contour1, CV_WHOLE_SEQ, 1);
if(areaC>areaMax){
areaMax = areaC;
}
contour1 = contour1.h_next();
}
while (contour2 != null && !contour2.isNull()){
areaC = cvContourArea(contour2, CV_WHOLE_SEQ, 1);
if(areaC>areaMax){
cvDrawContours(imgbin, contour1, CV_RGB(0, 0, 0), CV_RGB(0, 0, 0), 0, CV_FILLED, 8);
}
contour2 = contour2.h_next();
}
canvasBinFrame.showImage(converter.convert(imgbin));
canvasFrame.showImage(converter.convert(img1));
}
canvasFrame.dispose();
cvReleaseMemStorage(storage);
cvReleaseImage(img1);
cvReleaseImage(imgbin);
cvReleaseImage(imghsv);
}
catch (Exception e) {
System.out.println("Error while processing video");
// TODO: handle exception
}
}
}
Is there any other way of importing the video in javacv.
Are you sure that you have this file in your class path? Can you try the following to check if the file exists and show the output please?
File file = new File("Red.mp4");
System.out.println(file.exists());
I am using this Utility
public class Util_ImageLoader {
public static Bitmap _bmap;
Util_ImageLoader(String url) {
HttpConnection connection = null;
InputStream inputStream = null;
EncodedImage bitmap;
byte[] dataArray = null;
try {
connection = (HttpConnection) Connector.open(url + Util_GetInternet.getConnParam(), Connector.READ,
true);
inputStream = connection.openInputStream();
byte[] responseData = new byte[10000];
int length = 0;
StringBuffer rawResponse = new StringBuffer();
while (-1 != (length = inputStream.read(responseData))) {
rawResponse.append(new String(responseData, 0, length));
}
int responseCode = connection.getResponseCode();
if (responseCode != HttpConnection.HTTP_OK) {
throw new IOException("HTTP response code: " + responseCode);
}
final String result = rawResponse.toString();
dataArray = result.getBytes();
} catch (final Exception ex) {
}
finally {
try {
inputStream.close();
inputStream = null;
connection.close();
connection = null;
} catch (Exception e) {
}
}
bitmap = EncodedImage
.createEncodedImage(dataArray, 0, dataArray.length);
int multH;
int multW;
int currHeight = bitmap.getHeight();
int currWidth = bitmap.getWidth();
multH = Fixed32.div(Fixed32.toFP(currHeight), Fixed32.toFP(currHeight));// height
multW = Fixed32.div(Fixed32.toFP(currWidth), Fixed32.toFP(currWidth));// width
bitmap = bitmap.scaleImage32(multW, multH);
_bmap = bitmap.getBitmap();
}
public Bitmap getbitmap() {
return _bmap;
}
}
When I call it in a listfield which contains 10 childs, then the log keeps saying failed to allocate timer 0: no slots left.
This means the memory is being used up and no more memory to allocate again and as a result my main screen cannot start.
At the same time you have the following objects in memory:
// A buffer of about 10KB
byte[] responseData = new byte[10000];
// A string buffer which will grow up to the total response size
rawResponse.append(new String(responseData, 0, length));
// Another string the same length that string buffer
final String result = rawResponse.toString();
// Now another buffer the same size of the response.
dataArray = result.getBytes();
It total, if you downloaded n ascii chars, you have simultaneously 10KB, plus 2*n bytes in the first unicode string buffer, plus 2*n bytes in the result string, plus n bytes in dataArray. If I'm not wrong, that sums up to 5n + 10k. There's room for optimization.
Some improvements would be:
Check response code first, and then read the stream if response code is HTTP 200. No need to read if server returned an error.
Get rid of strings. No need to convert to string if after that you are converting again to bytes.
If images are large, don't store them in RAM while downloading. Instead, open a FileOutputStream and write to a temporary file as you read from input stream. Then, if temporary images are still large enough to be displayed, downscale them.
Right now i am working on Image download from web.For this i set http connection like below code.
HttpConnection connection = (HttpConnection) Connector.open(url, Connector.READ_WRITE);
connection.setRequestMethod(HttpConnection.POST);
I am calling two images from web.for one picture it display image successfully.But for other picture it show error Unexpected response code:403.I am not understand why this problem is occur.How can i download image from web.Is there any change in HttpConnection need to modify.
Please help me.
Have you tested this on a real phone, or just in the emulator?
If you are using the emulator, make sure you've configured it to connect to the internet, it won't be configured to do that by default.
BlackBerry emulator not connecting to internet
Use this function , as we get bytes from the http connection,you need to convert those bytes into image this function will do that for you , just pass the url of the image in arguments:
public static Bitmap connectServerForImage(String url) {
HttpConnection httpConnection = null;
DataOutputStream httpDataOutput = null;
InputStream httpInput = null;
int rc;
Bitmap bitmp = null;
try {
httpConnection = (HttpConnection) Connector.open(url);
rc = httpConnection.getResponseCode();
if (rc != HttpConnection.HTTP_OK) {
throw new IOException("HTTP response code: " + rc);
}
httpInput = httpConnection.openInputStream();
InputStream inp = httpInput;
byte[] b = IOUtilities.streamToBytes(inp);
EncodedImage hai = EncodedImage.createEncodedImage(b, 0, b.length);
int currentWidthFixed32 = Fixed32.toFP(hai.getWidth());
int currentHeightFixed32 = Fixed32.toFP(hai.getHeight());
int reqWidth = 48;
int reqHeight = 35;
int requiredWidthFixed32 = Fixed32.toFP(reqWidth);
int requiredHeightFixed32 = Fixed32.toFP(reqHeight);
int scaleXFixed32 = Fixed32.div(currentWidthFixed32, requiredWidthFixed32);
int scaleYFixed32 = Fixed32.div(currentHeightFixed32, requiredHeightFixed32);
hai = hai.scaleImage32(scaleXFixed32, scaleYFixed32);
return hai.getBitmap();
} catch (Exception ex) {
System.out.println("URL Bitmap Error........" +url+ ex.getMessage());
} finally {
try {
if (httpInput != null)
httpInput.close();
if (httpDataOutput != null)
httpDataOutput.close();
if (httpConnection != null)
httpConnection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return bitmp;
}
I don’t understand the answer to ”Why does gzip/deflate compressing a small file result in many trailing zeroes?”
(Why does gzip/deflate compressing a small file result in many trailing zeroes?)
How would you go about compressing small amount of data ½-2 Kbyte to minimum size in a .NET-environment?
(Runtime is not an issue for me. Can I trade speed for size? Should I use 3rd party products?
Developer license fees are OK, but runtime license not.)
Any suggestions about how I can improve the code below for:
(a) Higher compression ratio?
(b) More proper use of streams?
Here is the C#-code that needs to be improved:
private static byte[] SerializeAndCompress(MyClass myObject)
{
using (var inStream = new System.IO.MemoryStream())
{
Serializer.Serialize< MyClass >(inStream, myObject); // PROTO-buffer serialization. (Code not included here.)
byte[] gZipBytearray = GZipCompress(inStream);
return gZipBytearray;
}
}
private static Byte[] GZipCompress(MemoryStream inStream)
{
inStream.Position = 0;
byte[] byteArray;
{
using (MemoryStream outStream = new MemoryStream())
{
bool LeaveOutStreamOpen = true;
using (GZipStream compressStream = new GZipStream(outStream,
CompressionMode.Compress, LeaveOutStreamOpen))
{
// Copy the input stream into the compression stream.
// inStream.CopyTo(Compress); TODO: "Uncomment" this line and remove the next one after upgrade to .NET 4 or later.
CopyFromStreamToStream(inStream, compressStream);
}
byteArray = CreateByteArrayFromStream(outStream); // outStream is complete first after compressStream have been closed.
}
}
return byteArray;
}
private static void CopyFromStreamToStream(Stream sourceStream, Stream destinationStream)
{
byte[] buffer = new byte[4096];
int numRead;
while ((numRead = sourceStream.Read(buffer, 0, buffer.Length)) != 0)
{
destinationStream.Write(buffer, 0, numRead);
}
}
private static byte[] CreateByteArrayFromStream(MemoryStream outStream)
{
byte[] byteArray = new byte[outStream.Length];
outStream.Position = 0;
outStream.Read(byteArray, 0, (int)outStream.Length);
return byteArray;
}
i am using the following code for establishing Https connection
HttpsConnection httpConnector = null;
InputStream in = null;
Document doc ;
String content = "";
try
{
httpConnector = (HttpsConnection)Connector.open(url,Connector.READ_WRITE);
httpConnector.setRequestMethod(HttpConnection.GET) ;
in = httpConnector.openInputStream();
byte[] data = new byte[in.available()];
int len = 0;
int size = 0;
StringBuffer raw = new StringBuffer();
while ( -1 != (len = in.read(data)) ) {
raw.append(new String(data, 0, len));
size += len;
}
content = raw.toString().trim();
}
catch(Exception ex)
{
ex.printStackTrace();
return false;
}
try{
in.close();
in =null;
httpConnector.close();
httpConnector =null;
}catch(Exception ex)
{
Dialog.alert("Error:" + ex.getMessage());
return false;
}
}
i think i am able to establish the connection but the values are not coming. i am testing it on Simulator, i have not tested on device
I think your mistake is in the following line:
byte[] data = new byte[in.available()];
The available() method only returns how many bytes are immediately available for reading from the inputstream, but you are using it to initialize the size of the temporary byte array. Since it's possible that available() returns 0, you may be initializing a zero-length array.
It would be better to just initialize "data" with a fixed-length array.