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The experiment was conducted on six images (512¡¿512), as shown in Figure . A total of 2048 bits (256 ASCII characters) were embedded in a block size of 32¡¿32 with a gain of 0.125.
Embedding was performed by decomposing the image data into Y, Cb, and Cr, and embedding them into the luminance data.
The upper table shows the correct response rates for electronic data reading. This was more than 98.8%. The experiment was also conducted with images printed using a Canon TS5030 inkjet printer at 175 ppi (pixels per inch) (print size 74.3 mm). The image was scanned with a scanner built into the printer at 600dpi. After reading, the images were cropped and formatted to 512¡¿512 pixels, and watermark extraction was performed. The below Table shows the results of watermark identification. All the results showed a high rate of correct answers (greater than 95%)
As for embedded image quality, if print resistance is required, 𝑔𝑎𝑖𝑛 is about 0.125~0.1875, and the visual PSNR is about 26~28 dB.
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IEEE/ICACT20220093 Slide.19
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