Image taking/reproducing apparatus and data processing method

Abstract

The image sensing / playback apparatus has an image sensing device that senses an image of an object and obtains electrical image data, an input / output I / F that inputs / outputs image data from / to an external storage medium, and a system controller that sequentially performs a plurality of tasks, exclusively controlling the input / output I / F and having respective priorities decided in advance, while giving an opportunity to switch between the plurality of tasks after processing of one unit data amount of data. The one unit data amount is one of the first unit data amount that is large and the second unit data amount that is smaller than the first unit data amount. If an instruction is given to perform the second task of the plurality of tasks while the first task, different from the second task, is performed to process the first unit data amount at a time, the system controller sets the unit data amount of one with a higher priority of the first and second tasks to the first unit data amount and the unit data amount of the other task with a lower priority to the second unit data amount to perform the tasks.

Description

technical field [0001] The present invention relates to an image capturing and reproducing device and a method for processing image data and non-image data in the image capturing and reproducing device, and in particular, relates to an image capturing and reproducing device capable of inputting and outputting image data through a common input and output interface such as a recording medium to perform multiple tasks And the processing method of image data and non-image data in the image shooting and reproducing device. Background technique [0002] Conventionally, general image capture and playback devices include so-called input / output devices for writing data to and reading data from a recording medium in order to record captured images and reproduce recorded images. Its CPU is controlled in so-called multitasking that appears to execute multiple processes at the same time. When multitasking is used for control in this way, when different tasks access a common I / O device, ...

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Problems solved by technology

[0004] However, although the point of determining the access time and sleep time once according to the priority is described in the Japanese Patent Laid-Open No. 10-283204, if such control is used, the task with the highest priority does not request access to the common device, and only When a low-priority task requests access to a common device, it may happen that all tasks become sleep time

In this case, the processing efficiency is poor because no tasks access the common device

[0005] In addition, even if the access time and sleep time between a plurality of tasks achieve high processing efficiency at a certain time, when one of the plurality of tasks ends, for example, the same access time and sleep time continue, so especially when When the task with high priority ends, it may happen that all tasks with low priority that continue to be processed will become sleep time, and the processing efficiency will be poor.

[0006] Furthermore, when a plurality of tasks are accessing a common device and a task with a lower priority is added, as a result, all tasks with a lower priority do not go to sleep. Processing multiple tasks efficiently, so that the processing of high-priority tasks takes more time

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