A kind of image shooting brightness control method and device

Abstract

The embodiment of the present invention discloses an image shooting brightness control method and device, which relates to the field of image processing, and provides a method for controlling image shooting based on the distribution of detailed features contained in each brightness category area in an image frame in a preview image frame. It is a method of controlling the exposure parameters used during the shooting, thereby controlling the brightness of the captured image. In the embodiment of the present invention, the preview image frame is obtained, and the brightness level n of each pixel in the preview image frame is determined; according to the determined brightness level n of each pixel point, the preview image frame is divided into M category areas ; According to the distribution of the detailed features contained in each category area in the preview image frame, determine the exposure adjustment level required when shooting the preview image frame; adjust the pre-acquired exposure parameters according to the determined exposure adjustment level, The image is captured according to the adjusted exposure parameters; thus the above functions are realized.

Description

Method and device for controlling brightness of image capture technical field The invention relates to the field of image processing, in particular to a method and device for controlling brightness of image shooting. Background technique With the increasing popularity of photographic equipment, how to control exposure is a basic ability of professional photographers, which is hardly available to non-professionals. In addition to pursuing special exposure effects, users generally require reasonable exposure to enrich the picture information and avoid information loss, so the automatic exposure function is very necessary for ordinary users. The premise of controlling exposure is to meter the current scene before shooting. Existing light metering methods in the prior art include: average light metering, spot light metering, estimated light metering, manual light metering, and the like. Average metering is to calculate the average brightness of the entire image to determine ...

AI Technical Summary

Problems solved by technology

Average metering is suitable for most scenes, but the effect is not ideal for some special scenes such as backlit scenes, outdoor scenes through windows, and shooting against light sources; spot metering has no major advantages except for fast calculation speed. On the contrary, due to the small sampling range, automatic exposure oscillation is prone to occur; evaluation metering is an extension of spot metering, which expands the selected points into selected areas, and then performs weighted calculations for each area. This algorithm can reduce the risk of spot metering. The possibility of automatic exposure oscillation may occur, but the effect is still unsatisfactory for special scenes; manual metering is to push the choice of metering range to the user and let the user choose, but for most users who lack photography knowledge, How to choose and whether the choice is reasonable has always troubled users

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