Image encoding apparatus and method of camera device
An apparatus and method for adjusting compression rate based on the image size analysis in a camera device are provided. The image processing apparatus includes a compression rate determiner which determines a compression rate according to complexity of an image by extracting auto focus filter values of the image acquired from the camera, a processor which processes the image acquired from the camera in a unit of the line, and a still image codec which compresses line images output from the processor at the compression rate.
1. An image processing apparatus of a camera, the apparatus comprising:
a table which stores one or more factors for determining compression rate of an image;
a processor which processes an image acquired from the camera in a unit of a line, and determines a complexity of the image using edge data of the image;
a compression rate determiner which configures at least a part of the image acquired from the camera as a window, extracts auto focus filter values by filtering pixels in the window, and identifies, in the table, a factor corresponding to the complexity of the image by comparing the auto focus filter values with a predetermined value; and
a still image codec which compresses line images output from the processor at a compression rate corresponding to the identified factor.
2. The apparatus of claim 1 , wherein the compression rate determiner comprises:
a filter which generates the auto focus filter values by filtering luminance data or Green (G) data of the image acquired from the camera;
a summing unit which sums the auto focus filter values; and
a determiner which analyzes the summed auto focus filter value to identify the factor for adjusting the compression rate according to the complexity of the image.
3. The apparatus of claim 1 , wherein the processor comprises:
a pre-processor which corrects auto exposure and focus, lens shading, and dead pixels of the image acquired from the camera; and
a post-processor which performs color interpolation and image conversion on the pre-processed image.
4. The apparatus of claim 1 , wherein the processor comprises:
a pre-processor which corrects auto exposure and focus, lens shading, and dead pixels of the image acquired form the camera;
an image scaler which scales the pre-processed image to a size of a display screen;
a first post-processor which performs color interpolation and image conversion on the scaled image; and
a second post-processor which performs color interpolation and image conversion on the pre-processed image and sends the post-processed image to the still image codec.
5. The apparatus of claim 1 , further comprising multiplexing viewing and the compressed images as line images and sending the multiplexed images to an application processor.
6. The apparatus of claim 5 , wherein the multiplexed images include header information for identifying the viewing and compressed images.
7. An image processing method of a camera including a table which stores one or more factors for determining compression rate of an image, the method comprising:
processing an image acquired from the camera in a unit of a line;
determining a complexity of the image using edge data of the image;
configuring at least a part of the image acquired from the camera as a window;
extracting auto focus filter values by filtering pixels in the window;
identifying, in the table, a factor corresponding to the complexity of the image by comparing the auto focus filter values with a predetermined value; and
compressing the processed line images at the compression rate corresponding to the identified factor.
8. The method of claim 7 , wherein the identifying of the factor comprises:
generating the auto focus filter values by filtering luminance data or Green (G) data of the image acquired from the camera;
summing the auto focus filter values; and
identifying the factor for adjusting the compression rate according to the complexity of the image by analyzing the summed auto focus filter value.
9. The method of claim 7 , wherein the processing of the image comprises:
pre-processing the image to correct auto exposure and focus, lens shading, and dead pixels of the image acquired from the camera; and
post-processing the pre-processed image through color interpolation and image conversion.
10. The method of claim 7 , wherein the processing of the image comprises:
pre-processing the image to correct auto exposure and focus, lens shading, and dead pixels of the image acquired form the camera;
scaling the pre-processed image to a size of a display screen;
post-processing the scaled image through color interpolation and image conversion on the scaled image; and
post-processing the pre-processed image through color interpolation and image conversion.
11. The method of claim 7 , further comprising multiplexing viewing and the compressed images as line images and sending the multiplexed images to an application processor.
12. The method of claim 11 , wherein the multiplexed images include header information for identifying the viewing and compressed images.
13. At least one non-transitory processor readable medium for storing a computer program of instructions configured to be readable by at least one processor for instructing the at least one processor to execute a computer process for performing the method as recited in claim 7 .