Method and apparatus for image data reading back

Abstract

The embodiment of the invention discloses an image-data read-back method and a device thereof; the method disclosed by the embodiment of the invention comprises the steps that: the acquired image data is cached; the bit width of the cached image data is transformed; the image data is transmitted according to the time sequence of interfaces used for receiving data by an image processing unit. The device comprises a data caching module used for caching the acquired image data, a data output module used for transforming the bit width of the cached image data and transmitting the image data according to the time sequence of interfaces used for receiving data by the image processing unit. By using the embodiment of the invention, the time sharing processing and the batch processing of the image data can be realized.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method and device for reading back image data. Background technique [0002] The application of image processing technology in mobile terminals is becoming more and more common. Image processing circuits are generally integrated in multimedia SOC (System On Chip, System on Chip) chips of mobile terminal systems to process image data collected by cameras. Due to the improvement of market demand and technical level, the requirements for the specifications of the image processing module are also continuously improved, and higher requirements are put forward for the bus bandwidth, and the implementation process is becoming more and more complicated. [0003] In the prior art, a kind of image processing method is to design image processing subsystem and Camera (camera) interface in a SOC system, as figure 1 As shown, the Camera interface collects the image data output by the Camera, a...

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Problems solved by technology

[0006] In the prior art, the image processing sub-module is directly connected to the image input interface, so the processing speed of the image processing sub-module must be fast enough to meet the first constraint, but some image processing processes take a long time, and this part alone Proposing performance requirements will greatly increase the difficulty of design

In addition, after the image data is processed, the amount of data may increase, resulting in an increase in the amount of data sent to the storage bus. When the bus bandwidth is constant, the access time to the bus increases when using the method provided by the prior art. According to the second constraints, need to give higher bus access priority

This may cause other lower-priority devices on the bus to be unable to obtain bus resources for a long time, thereby affecting the performance of the entire system; if the bus is not properly released, image data may be lost

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