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    <p>After a Long struggle I have solved the issue with the following code.</p> <pre><code>public static Bitmap GrayscaleToBin(Bitmap bm2) { Bitmap bm; bm=bm2.copy(Config.RGB_565, true); final int width = bm.getWidth(); final int height = bm.getHeight(); int pixel1,pixel2,pixel3,pixel4,A,R; int[] pixels; pixels = new int[width*height]; bm.getPixels(pixels,0,width,0,0,width,height); int size=width*height; int s=width/8; int s2=s&gt;&gt;1; double t=0.15; double it=1.0-t; int []integral= new int[size]; int []threshold=new int[size]; int i,j,diff,x1,y1,x2,y2,ind1,ind2,ind3; int sum=0; int ind=0; while(ind&lt;size) { sum+=pixels[ind] &amp; 0xFF; integral[ind]=sum; ind+=width; } x1=0; for(i=1;i&lt;width;++i) { sum=0; ind=i; ind3=ind-s2; if(i&gt;s) { x1=i-s; } diff=i-x1; for(j=0;j&lt;height;++j) { sum+=pixels[ind] &amp; 0xFF; integral[ind]=integral[(int)(ind-1)]+sum; ind+=width; if(i&lt;s2)continue; if(j&lt;s2)continue; y1=(j&lt;s ? 0 : j-s); ind1=y1*width; ind2=j*width; if (((pixels[ind3]&amp;0xFF)*(diff * (j - y1))) &lt; ((integral[(int)(ind2 + i)] - integral[(int)(ind1 + i)] - integral[(int)(ind2 + x1)] + integral[(int)(ind1 + x1)])*it)) { threshold[ind3] = 0x00; } else { threshold[ind3] = 0xFFFFFF; } ind3 += width; } } y1 = 0; for( j = 0; j &lt; height; ++j ) { i = 0; y2 =height- 1; if( j &lt;height- s2 ) { i = width - s2; y2 = j + s2; } ind = j * width + i; if( j &gt; s2 ) y1 = j - s2; ind1 = y1 * width; ind2 = y2 * width; diff = y2 - y1; for( ; i &lt; width; ++i, ++ind ) { x1 = ( i &lt; s2 ? 0 : i - s2); x2 = i + s2; // check the border if (x2 &gt;= width) x2 = width - 1; if (((pixels[ind]&amp;0xFF)*((x2 - x1) * diff)) &lt; ((integral[(int)(ind2 + x2)] - integral[(int)(ind1 + x2)] - integral[(int)(ind2 + x1)] + integral[(int)(ind1 + x1)])*it)) { threshold[ind] = 0x00; } else { threshold[ind] = 0xFFFFFF; } } } /*------------------------------- * --------------------------------------------*/ bm.setPixels(threshold,0,width,0,0,width,height); return bm; } </code></pre>
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