Video camera which executes a first process and a second process on image data
View Patent ↗A data-processing circuit includes a distributor. Raw image data of horizontal 3840 pixels×vertical 2160 pixels that is periodically outputted from a CMOS-type imaging device is divided by the distributor into four blocks of partial image data. The divided four blocks of partial image data are subjected to a pre-process in parallel by first to fourth pre-processing blocks. On the other hand, raw image data of horizontal 1280 pixels×vertical 960 pixels that is periodically outputted from a CCD-type imaging device is serially subjected to a pre-process by a fifth pre-processing block. The number of pixels of the raw image data outputted from the CCD-type imaging device is equal to or less than ¼ the number of pixels of the raw image data outputted from the CMOS-type imaging device. A numerical value “4” is equivalent to the number of parallel pre-processes on the raw image data outputted from the CMOS imaging device.
1. A video camera, comprising:
an imager, having an imaging surface irradiated with an optical image of an object scene, which outputs first image data having pixels equivalent to a first number;
a first processor which executes a first process on the first image data outputted from said imager;
a creator which creates second image data having pixels equivalent to a second number different from said first number based on the first image data processed by said first processor; and
a second processor which executes a second process on the second image data created by said creator in synchronous with a frequency having a numerical value based on the difference between the first number and the second number.
2. A video camera according to claim 1 , wherein said first processor executes said first process in synchronous with a frequency having a numerical value based on a reference frequency, and the frequency for said second process has a numerical value obtained by multiplying a ratio of said second number to said first number by a numerical value that said reference frequency indicates.
3. A video camera according to claim 2 , wherein said first processor includes: a divider which divides said first image data into N blocks (N: an integer equal to or more than two) of partial image data; and a parallel processor which executes in parallel said first process on the N blocks of partial image data divided by said divider, and the frequency for said first process has a numerical value that is 1/N the numerical value that said reference frequency indicates.
4. A video camera according to claim 3 , wherein said second processor serially executes said second process on said second image data, and said second number is 1/N said first number.
5. A video camera according to claim 1 , wherein said creator includes: an allocator which allocates an extraction area covering pixels equivalent to said second number, on said imaging surface; and an extractor which extract, as said second image data, one portion of image data belonging to the extraction area allocated by said allocator.
6. A video camera according to claim 5 , further comprising a mover which moves said extraction area in a direction to offset a movement of said imaging surface in a direction orthogonal to an optical axis, wherein said imager repeatedly outputs said first image data.
7. A video camera according to claim 1 , wherein said first image data is data including both an optical black component and an object-scene-image component, and said second image data is data including only said object-scene-image component out of said optical black component and said object-scene-image component.
8. A video camera, comprising:
an imager, having an imaging surface irradiated with an optical image representing a scene, which outputs first image data having pixels equivalent to a first number;
a divider which divides the first image data outputted from said imager into N blocks (N: an integer equal to or more than two) of partial image data;
a first processor which executes in parallel a first process on the N blocks of partial image data divided by said divider;
a creator which creates second image data having pixels equivalent to a second number that is equal to or less than 1/N said first number based on the N blocks of partial image data processed by said first processor; and
a second processor which serially executes a second process on the second image data created by said creator.
9. A video camera according to claim 8 , wherein said first processor and said second processor respectively execute said first process and said second process in synchronous with a common frequency.
10. A video camera according to claim 8 , wherein said first processor executes said first process in synchronous with a first frequency equivalent to 1/N a reference frequency, and said second processor executes said second process in synchronous with a second frequency that is equal to or more than said first frequency.
11. A video camera according to claim 8 , wherein said creator includes: an allocator which allocates an extraction area covering pixels equivalent to said second number, on said imaging surface; and an extractor which extracts, as said second image data, one portion of image data belonging to the extraction area allocated by said allocator.
12. A video camera according to claim 11 , further comprising a mover which moves said extraction area in a direction to offset a movement of said imaging surface in a direction orthogonal to an optical axis, wherein said imager repeatedly outputs said first image data.
13. A video camera according to claim 8 , wherein said first image data is data including both an optical black component and a scene image component, and said second image data is data including only said scene image component out of said optical black component and said scene image component.
14. A video camera, comprising:
an imager, having an imaging surface irradiated with an optical image representing a scene, which outputs first image data having pixels equivalent to a first number;
a first processor which executes a first process in synchronous with a first frequency on the first image data outputted from said imager;
a creator which creates second image data having pixels equivalent to a second number different from the first number based on the first image data processed by said first processor; and
a second processor which executes a second process in synchronous with a second frequency indicating a numerical value based on a difference between the first number and the second number, on the second image data created by said creator, wherein
said first processor includes: a divider which divides the first image data into N blocks (N: an integer equal to or more than two) of partial image data; and a parallel processor which executes in parallel the first process on the N blocks of the partial image data divided by said divider.
15. A video camera according to claim 14 , wherein the first frequency indicates a numerical value that is 1/N the numerical value indicated by a reference frequency, and the second frequency indicates a numerical value obtained by multiplying a ratio of the second number to the first number by a numerical value indicated by the reference frequency.
16. A video camera according to claim 14 , wherein said second processor serially executes the second process on the second image data, and the second number is 1/N the first number.
17. A video camera according to claim 14 , wherein said creator includes:
an allocator which allocates an extraction area covering pixels equivalent to the second number, on said imaging surface; and
an extractor which extracts, as the second image data, one portion of image data belonging to the extraction area allocated by said allocator.
18. A video camera according to claim 17 , further comprising a mover which moves the extraction area in a direction to offset a movement of said imaging surface in a direction orthogonal to an optical axis, wherein said imager repeatedly outputs the first image data.
19. A video camera according to claim 14 , wherein the first image data is data including both an optical black component and a scene image component, and the second image data is data including only the scene image component out of the optical black component and the scene image component.