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POCompressing IplImage to JPEG using libjpeg in OpenCV
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  1. POCompressing IplImage to JPEG using libjpeg in OpenCV
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    copied!<p>So I have this problem. I have an IplImage that i want to compress to JPEG and do something with it. I use libjpeg8b.The code exit when it goes the function of jpeg_start_compress() with an error of "Bogus input colorspace" .Here are my code.</p> <pre><code>#include "highgui.h" #include &lt;stdio.h&gt; #include "jpeglib.h" #include "cv.h" #include &lt;iostream&gt; #include &lt;fstream&gt; using namespace std; using namespace cv; #pragma comment(lib, "jpeglib.lib") bool ipl2jpeg(IplImage *frame, unsigned char **outbuffer, unsigned long*outlen) { IplImage *img = new IplImage; memcpy(img,frame,frame-&gt;nSize); unsigned char *outdata = (uchar *) img-&gt;imageData; struct jpeg_compress_struct cinfo = {0}; struct jpeg_error_mgr jerr; JSAMPROW row_ptr[1]; int row_stride; *outbuffer = NULL; *outlen = 0; cinfo.err = jpeg_std_error(&amp;jerr); jpeg_create_compress(&amp;cinfo); jpeg_mem_dest(&amp;cinfo, outbuffer, outlen); cinfo.image_width = frame-&gt;width; cinfo.image_height = frame-&gt;height; cinfo.input_components = frame-&gt;nChannels; cinfo.in_color_space = JCS_RGB; jpeg_set_defaults(&amp;cinfo); jpeg_start_compress(&amp;cinfo, TRUE); system("pause"); row_stride = frame-&gt;width * frame-&gt;nChannels; while (cinfo.next_scanline &lt; cinfo.image_height) { row_ptr[0] = &amp;outdata[cinfo.next_scanline * row_stride]; jpeg_write_scanlines(&amp;cinfo, row_ptr, 1); } jpeg_finish_compress(&amp;cinfo); jpeg_destroy_compress(&amp;cinfo); return true; } int main() { ofstream fout("text.txt"); unsigned char **buf; buf = new unsigned char* [120]; for(int i=0;i&lt;500;i++) { buf[i] = new unsigned char[120]; } for(int i=0;i&lt; 120;i++) { for(int j=0;j&lt;120;j++) { buf[i][j] = 0; } } unsigned long *len = new unsigned long; *len = 120*120; Ptr&lt;IplImage&gt; img = cvLoadImage("test.jpg",CV_LOAD_IMAGE_GRAYSCALE); ipl2jpeg(img,buf,len); for(int i=0;i&lt; 120;i++) { for(int j=0;j&lt;120;j++) { fout&lt;&lt;buf[i][j]&lt;&lt;endl; } } return 0; } </code></pre>
 

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