## 5 Results of Tests and Analyses
### Proposed Methods of Line Length Estimation of the Reconstructed Image
Figure 32: (a) The normalized values of the adopted measures (method I, II and III) calculated in domain of image line length \(d_{\Delta}\) for the accuracy \(\Delta=0.00001\) (for the original image shown in Figure 7e) and images reconstructed on the basis of the recorded revealing emission signals at frequency \(f_{o}=450\) MHz (receiving bandwidth \(BW=50\) MHz, accuracy \(\Delta=0.00001\)), (b) for estimated line length \(d_{\Delta}=3303.22632\) and (c) for estimated line length \(d_{\Delta}=3303.22637\) —multiple of image summation \(Sum_{MTL}=15\), the source of revealing signal emission—display monitor, VGA standard. Figure 34: The normalized values of the adopted measures (method I, II and III) calculated in domain of image line length \(d_{\Delta}\) for the accuracy (**a**) \(\Delta=0.1\), (**b**) \(\Delta=0.01\), (**c**) \(\Delta=0.001\) and (**d**) \(\Delta=0.0001\) (for the original image shown in Figure 7f). Figure 33: (**a**) The normalized values of the adopted measures (method I, II and III) calculated in domain of image line length \(d_{\Delta}\) for the accuracy \(\Delta=1.0\) (for the original image shown in Figure 7f) and images reconstructed on the basis of the recorded revealing emission signals at frequency \(f_{o}=235\) MHz (receiving bandwidth \(BW=10\) MHz, accuracy \(\Delta=1.0\)), (**b**) for estimated line length \(d_{\Delta}=1863.00000\), image summation multiple \(Sum_{MTL}=1\) and (**c**) for estimated line length \(d_{\Delta}=1863.00000\), multiple of image summation \(Sum_{MTL}=60\) —the source of revealing signal emission—display of laser printer. Table 20 shows the estimated values of the line length \(d_{\Delta}\) of the analyzed image. These are the values for which the criteria of the adopted methods have been met, allowing us to carry out the process of estimating the image line length for the next accuracy step \(\Delta\). Conclusions from the Analysis, Recommendations for the Software Implementation of Automatic Image Recognition  
The article presents the issue related to the correct determination of the line length of the reconstructed image on the basis of the recorded revealing emission signal. The correct line length ensures that the graphic elements contained in the image remain vertical. They are not tilted to the left or right. Determining the correct value of \(d_{\Delta}\) is very important when it is necessary to further process the image by the coherent summation method in order to improve its quality, i.e., improve the \(SNR\) parameter. Incorrectly determined line length of the reconstructed image causes the summation of several dozen repetitions of  
\begin{table}
\begin{tabular}{l c c c} \hline \hline \multirow{2}{*}{**Accuracy**} & **Method I** & **Method II** & **Method III** \\  & \(Sum\_minMat\_I  
the same image, reconstructed from a sufficiently long implementation of the revealing emission signal, resulting in blurring and not sharpening the data contained in the image. The solution to the problem is not to use common image contrast assessment measures that can be combined with the line length of the image. This is because changing the value of d does not affect the amplitudes of the background pixels of the image and the data contained in the image. Hence, the authors proposed their own methods (measures) and criteria, which were verified with appropriate analyzes and which can be used to automate the process of determining the correct \(d_{\Delta}\) value. The recorded, revealing emission signals and reconstructed on their basis images were used for the analysis (Figure 7). The source of the mentioned emissions was a computer set, on the monitor of which various images were displayed in order to check the proposed methods in terms of their effectiveness for various structures of the reconstructed images. The computer monitor worked with two standards: analog VGA and digital HDMI. In addition, a laser printer display was used as the source of the revealing emissions.