After extrapolation, it was found that the value of the maximum-value pixel in the reconstructed 478 keV γ-ray production image overestimates the simulated production by an average of 9.2%, and that the standard deviation associated with the same value is 11.4%.
The PSNR measure can be obtained from the MSE as follows: (3) where MAX I is the maximum value that a pixel can retain, e.g., if using an 8 bit pixel representation, the maximum value will be 255.
Maximum temperature thresholding: From each two minute block of data the function produces a single composite image of maximum temperature, which is constructed from the maximum value at each pixel position through that time span (Patrick et al. 2010).
An empirical threshold is then used to locate the boundary of the lake against the crater wall 2) Maximum temperature thresholding: From each two minute block of data the function produces a single composite image of maximum temperature, which is constructed from the maximum value at each pixel position through that time span (Patrick et al. 2010).
where I stands for the resulting image obtained with the CPU, K is the resulting image obtained with the GPU or the FPGA, m and n are de dimensions of the image and MAX I is the maximum value that a pixel can reach (255 in our case).
where MSE is the mean squared error, m is the width of the images, n is the height of the images, I and J are the two compared images, and MAX I is the maximum value of a pixel in image I. Since the images are converted to gray scale for the comparison, MAX I is 255.
Approaches, like comparing the pixel to be added with the average intensity of the region grown at each step, maximum pixel value at region boundary, or maximum value of the pixels inside the region, tried to improve segmentation accuracy by controlling overgrowing to homogenous neighboring areas [ 9, 10].
The PW measurement can be naively defined as the brightest luminance pixel in the image, but to avoid noisy pixels and lonely bright pixels, it can be better defined as a global maximum value of the local minimum of pixel luminance in a small window of size.
Hence, for each pixel the maximum value of the three indexes is considered so that: {text{TI }} =, hbox{max}, left( {{text{TI}}_{R - G},{text{ TI}}_{R - B},{text{ TI}}_{G - B} } right) (3).
The pixel having maximum value in the largest component is labeled as the center of concave region.
