Image definition calculating method and apparatus
A technology of image definition and calculation method, which is applied in the field of digital photography, can solve the problems of low sensitivity and slow calculation, and achieve high sensitivity, small calculation amount and good real-time performance
Active Publication Date: 2013-01-30
INLIFE HANDNET CO LTD
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[0004] The technical problem to be solved by the present invention is to provide an image definition calculation method and device with fast calculation speed and high sensitivity for the defects of slow calculation and low sensitivity in the above-mentioned image definition calculation method of the prior art
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[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0030] Such as figure 1 As shown, a method for calculating image sharpness, the method includes:
[0031] Step 101, taking the luminance values of 3 to 6 pixel points in each row of the two-dimensional image as a group, and obtaining the maximum value, minimum value, and average value of the luminance values of each group;
[0032] Step 102, according to the maximum value, minimum value, and average value, obtain the sum of the squares of the maximum value minus the average value, the minimum value minus the average value of each group of brightness values;
[0033] Step 103, respectively adding up the square sums of each group of data of each row to obtain the temporary definition of each row of data;
[0034] St...
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The invention discloses an image definition calculating method and apparatus; the image definition calculating method comprises the steps of: taking brightness values of 3-6 pixel points of each row of data of a two-dimensional image as a group, and calculating a maximum value, a minimum value and an average value of various groups of the brightness values of each row of data; depending on the maximum value, the minimum value and the average value, calculating a square sum of subtracting the average value from the maximum value and subtracting the average value from the minimum value of the various groups of the brightness values of each row of data; respectively adding various groups of the square sums of each row of the data to obtain a temporary definition of each row of the data; depending on the temporary definition of each row of the data, ordering the temporary definitions of all rows of the data, selecting the four maximum temporary definitions; and calculating a mean value of the four maximum temporary definitions, and taking the mean value as the definition of the current two-dimensional image. The image definition calculating method has the advantages of low calculating amount, good timeliness and high sensitivity, and is capable of preferably satisfying the requirement of an automatic focusing system on evaluation of the image definition.
Description
technical field [0001] The invention relates to the field of digital photography, and more specifically relates to a method and device for calculating image clarity during the focusing process of digital photography equipment. Background technique [0002] In recent years, with the rapid development of digital image analysis technology, the passive automatic focusing technology based on digital image does not depend on the distance information, and directly adjusts the focus through the clarity of the collected image. Advantages such as mechanism simplification are widely used. In the process of using the shooting device to focus, it is necessary to identify the best focus position through the sharpness value of each frame of the image. If the sharpness calculation is not accurate, it will directly affect the focusing effect of the shooting device during the shooting process and the quality of the picture. quality. [0003] At present, the commonly used sharpness calculati...
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IPC IPC(8): G06T1/00
Inventor 刘道李炜
Owner INLIFE HANDNET CO LTD