US 9,866,727 B2 · Image calibration method and device

Abstract

An image calibration method and device. A deviation compensation coefficient of each pixel is calculated according to image data generated by strong and weak lighting parameters, and the deviation compensation coefficient is used to calibrate data of each image pixel collected and output by an image sensing unit. Therefore, the influence of inconsistency of each photosensitive element of the image sensing unit on the image greyscale can be eliminated, so that the effect of document medium image recognition is increased. The method in the embodiments of the present invention comprises: S1, acquiring a strong lighting parameter of each photosensitive element within a long exposure time and a weak lighting parameter thereof within a short exposure time; S2, acquiring image data of a sheet medium; and S3, according to the strong lighting parameter, the weak lighting parameter and the image data, calculating the calibrated image data of the sheet medium.

Claims10

Dependent claims

A method for image calibration comprising:

S1:
obtaining, by a processor, for each of photosensitive elements in a sensor, a high lighting parameter corresponding to a long exposure time and a low lighting parameter corresponding to a short exposure time;
S2:
obtaining, by the processor, image data of a sheet medium;
and
S3:
calculating, by the processor, calibrated image data of the sheet medium based on the high lighting parameter, the low lighting parameter and the image data;
wherein the process of obtaining, by the processor, for each of the photosensitive elements in the sensor, the high lighting parameter corresponding to the long exposure time comprises:
performing a long time exposure on a gray scale board for a period of tH;
and
recording image data IHi obtained through the long time exposure and a corresponding gray value GrayH.

8 more elements

Dependencies are inferred from the claim text.

Image calibration method and device

Life of this patent

Image calibration method and device

Life of this patent

Abstract

Claims10