Decode static image = Q: How to convert NSBitmapImageRep* to ZXBinaryBitmap* ??
notarysojac
- (void) decodeStaticImage:(NSBitmapImageRep*) inBitmap
{
ZXBinaryBitmap* zxbitmap = [someZXobject convert: inBitmap];
ZXDecodeHints* hints = [[[ZXDecodeHints alloc] init] autorelease];
ZXQRCodeReader* reader = [[[ZXQRCodeReader alloc] init] autorelease];
ZXResult* result = [reader decode:zxbitmap hints:hints];
[captureDelegate captureResult:self result:result];
}
notarysojac
Well -- who knows if this'll be of value to anyone - but here it is...
// ----------------------------------------------------------------------------------------------
- (CGImageRef) makeCGImageFromNSImage:(NSImage*) inImage
{
CGImageRef result;
NSData* imagedata = [inImage TIFFRepresentation];
NSBitmapImageRep* bitmaprep = [[NSBitmapImageRep imageRepWithData:imagedata] retain];
size_t rowBytes = [bitmaprep bytesPerRow];
size_t wid = [bitmaprep pixelsWide];
size_t hgt = [bitmaprep pixelsHigh];
size_t bpp = [bitmaprep bitsPerPixel];
size_t spp = [bitmaprep samplesPerPixel];
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)imagedata);
CGColorSpaceRef colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGBitmapInfo bitsInfo = kCGImageAlphaLast;
result = CGImageCreate(wid,hgt,spp,bpp,rowBytes,
colorspace,bitsInfo,provider,NULL,NO,
kCGRenderingIntentDefault);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorspace);
return(result);
}
//==========================================
- (void) decodeStaticImage:(NSImage*) inImage
{
NSLog(@"ZXCapture::decodeStaticImage - ENTER");
CGImageRef cgImage = [self makeCGImageFromNSImage:inImage];
ZXCGImageLuminanceSource* source = [[ZXCGImageLuminanceSource alloc] initWithCGImage:cgImage]
ZXHybridBinarizer* binarizer = [ZXHybridBinarizer alloc];
[[binarizer initWithSource:source] autorelease];
ZXBinaryBitmap* bitmap = [[[ZXBinaryBitmap alloc] initWithBinarizer:binarizer] autorelease];
@try
{
ZXDecodeHints* hints = [[[ZXDecodeHints alloc] init] autorelease];
ZXQRCodeReader* reader = [[[ZXQRCodeReader alloc] init] autorelease];
ZXResult* result = [reader decode:bitmap hints:hints];
[captureDelegate captureResult:self result:result];
}
@catch (ZXReaderException* rex)
{
NSLog(@"ERROR ZXCapture::decodeStaticImage - failed to decode, caught ReaderException [%@]",
rex.reason);
}
@catch (ZXIllegalArgumentException* iex)
{
NSLog(@"ERROR ZXCapture::decodeStaticImage - failed to decode, caught IllegalArgumentException '%@'",
iex.reason);
}
@catch (id ue)
{
NSLog(@"ERROR ZXCapture::decodeStaticImage - Caught unknown exception: %@", ue);
}
}
Steven Parkes
> At this point I am trying to derive a ZXBinaryBitmap* from an NSImage*.
- (CGImageRef)CGImageForProposedRect:(NSRect *)proposedDestRect context:(NSGraphicsContext *)referenceContexthints:(NSDictionary *)hints
This will return a CGImageRef and you can create a ZXCGImageLuminanceSource from that.
notarysojac
but did not work on this image taken with the camera in my iPhone....
Steven Parkes
> BTW - The error reported was that it could not locate the three corners. I would be interested to hear what you think might be the scoop.
notarysojac
Steven Parkes
However, the Java and C++ ports should be in parity (at least for QR codes) and since this image decodes in Java but not C++, that indicates there's a difference between the two that should be corrected.
Steven Parkes
I didn't try any hints, etc. We know there are images that the algorithms don't decode. I saved this to look at primarily because I wanted to check the Java vs. C++ results.
On Sep 10, 2012, at 8:13 PM, notarysojac <hydrat...@gmail.com> wrote:
> Hi Steven -
>
> Well yeah... that is simpler - I did not know that call would do the trick - but, if you say so - that's cool. Actually, I did see that call in the API - but the contents of what might need to be included in the referenceContexthints dictionary and whatever should be the size of the proposedDestRect introduced F.U.D. into the equation - so I did a hand-wrought build on the CGImageRef.
>
> Interestingly, the static image decode worked well on images created with 'code'... like this:
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> Anyway - the ZXing code is remarkably robust and capable - it's quite a pleasure to be working with it. Thanks...
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