JP2003060955A - Mobile phone with camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile phone with camera that enhances the frame rate of image display photographed by the camera. SOLUTION: An exclusive DSP, provided to an image data processing section 2 of the camera 1, converts a photographed image into LCD display data and transfers the converted data from the camera 1 to an LCD driver 4 by a switching operation of BUS changeover switches 6, 7, not via a CPU 3 as in the conventional mobile phone.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera-equipped mobile telephone configured to process data of an image photographed by a camera by a CPU. 2. Description of the Related Art A conventional camera-equipped cellular phone has a block diagram shown in FIG. And converted into an LCD display data format by the CPU 3,
This is performed in a three-stage process of transferring data from the PU 3 to the LCD driver 4. The transfer time from the camera 1 to the CPU 3 is 100 ms, and the data conversion process of the CPU 3 is 100
ms, and the transfer time from the CPU 3 to the LCD driver 4 is 100 ms, and the image taken by the camera 1 is LC
When calculating the frame rate displayed on the D screen 5,
The time to display one screen is 300 ms, which is 3.3 frames / second. [0003] However, it has been difficult for conventional camera-equipped mobile phones to further improve the frame rate of displaying images taken by the camera. In other words, in order to improve the frame rate, it is conceivable to increase the processing speed of the CPU 3 in the second stage, but the CPU 3 must not only perform the image processing of the camera 1 but also perform other processing. Therefore, it is difficult to dramatically increase the transfer rate in the third stage, and it is difficult to improve the frame rate. [0004] It is an object of the present invention to provide a camera-equipped mobile phone having an improved frame rate for displaying images taken by a camera. [0005] In order to achieve the above object, the present invention provides a camera, a CPU for processing image data taken by the camera, and an image display device for displaying the image data taken by the camera on an LCD. In a camera-equipped mobile phone having an LCD driver for receiving data after converting it into data and displaying the data on an LCD screen, the camera has a built-in image data processing unit for converting image data captured by the camera into LCD display data. In this case, the connection between the camera and the CPU is cut off, and BUS changeover switch means for connecting the image data processing unit and the LCD driver is provided. A camera-equipped mobile phone according to the present invention is a camera having a built-in image data processing unit for converting photographed image data into LCD display data.
U and the image data processing unit and LC
Since the BUS changeover switch means for connecting the D drivers is provided, the captured image is
The data can be converted to D display data and transferred from the camera to the LCD driver by switching the BUS switch without using the CPU as in the conventional case. Without increasing the frame rate, it is possible to improve the frame rate of displaying an image captured by a camera with a relatively simple configuration. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a mobile phone with a camera according to an embodiment of the present invention. B between camera 1, CPU 3 and LCD driver 4
It is configured to be selectively connectable by a US changeover switch means. This BUS changeover switch means has BUS changeover switches 6 and 7 connected in series by BUS8,
The BUS switch 6 is an image data processing unit 2 of the camera 1
And the BUS change switch 7 is configured to switch and connect the BUS 8 and the memory 9 of the CPU 3 with the LCD driver 4 in common. Further, conventionally, image data taken by the camera 1 is transferred to the CPU 3,
Although the PU 3 converts the data to LCD display data, the image data processing unit 2 of the camera 1 converts the image data captured by the camera 1 to LCD display data. Generally, an image data processing unit 2 of the camera 1
Is provided with a dedicated DSP, and the image data processing unit 2 can sufficiently perform conversion processing to LCD display data. Now, when an image captured by the camera 1 is displayed on the LCD screen 5, the connection between the camera 1 and the CPU 3 is disconnected by the BUS changeover switch 6, and the image data processing unit 2 and the BUS
BUS8 and LC with BUS switch 7
The D driver 4 is switched to be connected. Then
LCD display data for LCD screen 5 from camera 1 to B
LCD via US changeover switches 6, 7 and BUS8
The data is displayed on the LCD screen 5 from the driver 4. According to such a camera-equipped mobile phone, the data for LCD display can be sent directly from the camera 1 to the LCD driver 4, so that the camera 1
Is transferred to the CPU 3 and the UPU
After the data is converted into the data for LCD display at 3, the transfer time is reduced by half as compared with the case where the data is sent from the CPU 3 to the LCD driver 4. When image data captured by the camera 1 is stored in the memory 9 or the like, the BUS switch 6 is switched to disconnect the camera 1 from the BUS 8, and the image data processing unit 2 and the CPU 3 are connected. , CPU3
When the image data is processed by the following, the BUS changeover switch 6 is switched to disconnect the camera 1 from the BUS 8, and the image data processing unit 2 and the CPU 3 are connected.
After importing the image data into the CPU 3 and processing it,
By switching the BUS switch 7, the LCD driver 4 is connected to the memory 9 and the CPU 3, and can be displayed on the LCD screen 5 or stored in the memory 9. In the camera-equipped mobile phone having the above-described structure,
When the frame rate of the image display taken by the camera 1 is calculated, the transfer time from the camera 1 to the CPU 3 is omitted, the time required for the data conversion processing by the DSP of the image data processing unit 2 is 75 ms, and the camera 1 and the LCD screen 5 The transfer time to one screen is 75 ms, and the time required to display one screen is 150 ms, which is 6.6 frames / second.
This is the conventional frame rate of 3.3 frames /
This means that the time is improved about twice as much as the second. As described above, the camera-equipped mobile phone described above converts the captured image into LCD display data by the image data processing unit 2 of the camera 1 and, unlike the conventional one, does not involve the CPU 3 but the BUS changeover switch 6, 7 is transferred from the camera 1 to the LCD driver 4 by the switching operation of 7, so that the image taken by the camera with a relatively simple configuration can be displayed without increasing the processing speed of the CPU 3 or the transfer speed from the CPU 3 to the LCD driver 4. Can be doubled. As described above, the camera-equipped mobile phone of the present invention improves the frame rate of the displayed image without increasing the processing speed of the CPU or the transfer speed from the CPU to the LCD driver. Can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a camera-equipped mobile phone according to an embodiment of the present invention. FIG. 2 is a block diagram showing a conventional camera-equipped mobile phone. [Description of Signs] 1 Camera 2 Image data processing unit 3 CPU 4 LCD driver 5 LCD screen 6, 7 BUS switch

Claims (1)

Claims: 1. A camera, a CPU for processing image data captured by the camera, and an LCD receiving the image data captured by the camera after converting the data into LCD display data.
In a camera-equipped mobile phone provided with an LCD driver for displaying on a screen, the camera includes an image data processing unit for converting image data captured by the camera into data for LCD display, and the camera and the CPU.
A mobile phone with a camera, characterized in that a connection between the image data processing unit and the LCD driver is disconnected and a BUS changeover switch is provided for connecting the image data processing unit and the LCD driver.