average gradient


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average gradient

In sensitometry, a measure of the contrast of the film or film-screen system by determination of the slope of the sensitometric curve.
See also: gradient
References in periodicals archive ?
According to the figures of the evaluation indices, the variation rule can be described as: with the decrease of the power exponent, the average gradient, entropy and standard deviation of the fusion images increase while the correlation coefficient of the images, the distortion degree and the difference coefficient decrease.
According to the analysis of the above evaluation indices, the increase of the average gradient, standard deviation and entropy will result in the reduction of the spectrum fidelity (difference coefficient, distortion degree and correlation coefficient).
grad] indicates average gradient, and F (i, j) is the gray-value at the position of (i, j), m and n represent the size of the image.
Quality assessment of image fusion Entropy Average gradient Standard deviation (1) (2) (3) (1) (2) (3) (1) (2) (3) 6.
But the 25-year old former National Hill Climb Champion headed up to Yorkshire to tackle the infamous Holme Moss with an average gradient of ten per cent over 1.
The average gradient is one in eight and it reaches to within 66ft of the summit.
Mr Annett said, 'This year the Etape du Tour involved over 4,000 metres of climbing, including Puy Mary which goes up to 1,589 metres for five-and-a-half kilometres at an average gradient of 8%.
Although the trio are driving to France, once in the Alps they will unload their bicycles from the car roof rack and set up camp at the base of the 20-kilometre climb which has an average gradient of one in 12.
Average gradients for both the Standard Education and Reversed Education groups showed shifting away from their respective S-.
The differences between spontaneous ventilation and the controlled ventilation accomplished by positive airway pressure relate both to the average gradients of pressure developed during the tidal cycle and to their regional distributions across the lungs and chest wall.
Everything the radiologic technologist needs to know about film processing is covered here, from average gradients, characteristic curves and latitude to images in space, modulation transfer function and publicly owned treatment works.
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