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visual basic print barcode label detectedges routine in Java
Listing 19.5 detectedges routine Creating QR Code JIS X 0510 In Java Using Barcode creator for Android Control to generate, create QR Code image in Android applications. www.OnBarcode.comCreating QR Code In Java Using Barcode generation for Android Control to generate, create QR Code 2d barcode image in Android applications. www.OnBarcode.comJNIEXPORT void JNICALL Java_com_msi_manning_ua2efindedges_UA2EFindEdges_detectedges( JNIEnv * env, jobject obj, jobject bitmapgray, Input grayscale jobject bitmapedges) Bitmap Output edges { Bitmap AndroidBitmapInfo infogray; void* pixelsgray; AndroidBitmapInfo infoedges; void* pixelsedge; int ret; int y; int x; int sumX,sumY,sum; Setup masks int i,j; int Gx[3][3]; int Gy[3][3]; uint8_t *graydata; Point to uint8_t *edgedata; pixel data Creating Barcode In Java Using Barcode printer for Android Control to generate, create Barcode image in Android applications. www.OnBarcode.comBarcode Encoder In Java Using Barcode generation for Android Control to generate, create Barcode image in Android applications. www.OnBarcode.comGx[0][0] = -1;Gx[0][1] = 0;Gx[0][2] = 1; Gx[1][0] = -2;Gx[1][1] = 0;Gx[1][2] = 2; Gx[2][0] = -1;Gx[2][1] = 0;Gx[2][2] = 1; Gy[0][0] = 1;Gy[0][1] = 2;Gy[0][2] = 1; Gy[1][0] = 0;Gy[1][1] = 0;Gy[1][2] = 0; Gy[2][0] = -1;Gy[2][1] = -2;Gy[2][2] = -1; LOGI("detectedges in JNI code"); Generating PDF 417 In Java Using Barcode maker for Android Control to generate, create PDF-417 2d barcode image in Android applications. www.OnBarcode.comPainting ANSI/AIM Code 39 In Java Using Barcode maker for Android Control to generate, create Code 39 Full ASCII image in Android applications. www.OnBarcode.comSet up transformations
UCC - 12 Generation In Java Using Barcode generation for Android Control to generate, create Universal Product Code version A image in Android applications. www.OnBarcode.comEAN / UCC - 8 Encoder In Java Using Barcode generator for Android Control to generate, create UPC - 8 image in Android applications. www.OnBarcode.comif ((ret = AndroidBitmap_getInfo(env, bitmapgray, &infogray)) < 0) { LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret); return; } if ((ret = AndroidBitmap_getInfo(env, bitmapedges, &infoedges)) < 0) { LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret); return; } LOGI("gray image :: width is %d; height is %d; stride is %d; format is %d;flags is %d",infogray.width,infogray.height,infogray.stride, infogray.format,infogray.flags); if (infogray.format != ANDROID_BITMAP_FORMAT_A_8) { Generate QR Code ISO/IEC18004 In Visual Studio .NET Using Barcode encoder for Reporting Service Control to generate, create QR image in Reporting Service applications. www.OnBarcode.comPainting QR-Code In None Using Barcode generator for Word Control to generate, create QR-Code image in Microsoft Word applications. www.OnBarcode.comBuilding the JNI library
UCC-128 Reader In VB.NET Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comReading Universal Product Code Version A In None Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comLOGE("Bitmap format is not A_8 !"); return; } Encode PDF-417 2d Barcode In Visual C# Using Barcode generator for VS .NET Control to generate, create PDF-417 2d barcode image in .NET applications. www.OnBarcode.com2D Barcode Encoder In VS .NET Using Barcode maker for .NET Control to generate, create Matrix Barcode image in Visual Studio .NET applications. www.OnBarcode.comLOGI("color image :: width is %d; height is %d; stride is %d; format is %d;flags is %d",infoedges.width,infoedges.height,infoedges.stride, infoedges.format,infoedges.flags); if (infoedges.format != ANDROID_BITMAP_FORMAT_A_8) { LOGE("Bitmap format is not A_8 !"); return; } if ((ret = AndroidBitmap_lockPixels(env, bitmapgray, &pixelsgray)) < 0) { LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret); } if ((ret = AndroidBitmap_lockPixels(env, bitmapedges, &pixelsedge)) < 0) { LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret); } // modify pixels with image processing algorithm graydata = (uint8_t *) pixelsgray; edgedata = (uint8_t *) pixelsedge; Data Matrix 2d Barcode Encoder In Visual Studio .NET Using Barcode generator for Reporting Service Control to generate, create ECC200 image in Reporting Service applications. www.OnBarcode.comPDF-417 2d Barcode Scanner In Visual C# Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comAccess pixels
Linear Creator In Java Using Barcode drawer for Java Control to generate, create Linear 1D Barcode image in Java applications. www.OnBarcode.comReading Barcode In C# Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.comfor (y=0;y<=infogray.height - 1;y++) { for (x=0;x<infogray.width -1;x++) { sumX = 0; sumY = 0; // check boundaries if (y==0 || y == infogray.height-1) { Ignore sum = 0; border pixels } else if (x == 0 || x == infogray.width -1) { sum = 0; } else { Calculate X // calc X gradient dimension for (i=-1;i<=1;i++) { for (j=-1;j<=1;j++) { sumX += (int) ( (*(graydata + x + i + (y + j) * infogray.stride)) * Gx[i+1][j+1]); } } Calculate Y // calc Y gradient dimension for (i=-1;i<=1;i++) { for (j=-1;j<=1;j++) { sumY += (int) ( (*(graydata + x + i + (y + j) * infogray.stride)) * Gy[i+1][j+1]); } } sum = abs(sumX) + abs(sumY); } if (sum>255) sum = 255; Constrain if (sum<0) sum = 0; pixel values QR Code JIS X 0510 Recognizer In Java Using Barcode scanner for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.comGenerating EAN-13 Supplement 5 In None Using Barcode creator for Software Control to generate, create GTIN - 13 image in Software applications. www.OnBarcode.com*(edgedata + x + y*infogray.width) = 255 - (uint8_t) sum; } Calculate edge value
Android Native Development Kit
} AndroidBitmap_unlockPixels(env, bitmapgray); AndroidBitmap_unlockPixels(env, bitmapedges); } Like the prior function, this one takes two Bitmap arguments, both of which are grayscale images. The first contains the grayscale image B created in the converttogray method. The second bitmap argument C becomes the edges only version of the image. A number of variables D are defined to aid in the edge-detection process. Like the prior function, we have local pointers E to the image data. The Sobel Edge Detection algorithm involves a mathematical operation known as a convolution, which requires initializing a pair of convolution masks F. The convolution must be performed across the entire image G with the exception of the border pixels, which are skipped H. First the calculations are made in the x dimension I and then in the y dimension J. Once the calculations have been performed for a particular pixel, a new value is calculated based on the surrounding pixels and stored in the output image 1). Prior to storing a value, the new pixel value is constrained to be between 0 and 255 1!. You re now ready to compile this code, but before you can do that you need to define the make file for the library. 19.3.3 Compiling the JNI library
In addition to the C source file, you require a make file to instruct the NDK on how the library is compiled. The following listing contains the make file used with this library.
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