EMBEJIED::Embedded+Jisu

카메라 버퍼에 접근해서 Y,Cb,Cr값을 나누고 이진화와 원하는 곳에 선긋기를 해보았다. 포맷이 YUYV일 때, Y,Cb,Cr값은 아래 표와 같이 저장된다. Y1 Cb1 Y2 Cr1 Y3 Cb2 Y4 Cr2 · · · Y,Cb,Cr각각의 배열을 버퍼크기만큼 만들어서 버퍼에 있는 값을 차례대로 담으면 된다. 나중에 하나로 만들때도 똑같이 하면 된다. 이진화작업은 Y값만 살리고 Cb,Cr값은 128로 만들어 버리면 된다. Y값은 명도를 나타내는 값이라서 흑백만 남게된다. 아래 사진처럼 원하는 곳에 선을 긋고 싶으면 for문을 이용하여 원하는 경로를 지나는 Y,Cb,Cr값을 변경해주면 된다. 초록색으로 표시하고 싶으면 Cb,Cr값을 0으로 바꿔준다. 빨간색에 해당하는 Y,Cb,Cr값은 대략 80, 90, 24..

Input and output devices support this I/O method when the V4L2_CAP_STREAMING flag in the capabilities field of struct v4l2_capability returned by the VIDIOC_QUERYCAP ioctl is set. There are two streaming methods, to determine if the memory mapping flavor is supported applications must call the VIDIOC_REQBUFS ioctl. A driver can support many sets of buffers. Each set is identified by a unique buf..

Now, set the data format. Each devices are exchange different kind of data with applications. A single mechanism exists to negotiate all data formats using the aggregate struct v4l2_format and the VIDIOC_G_FMT and VIDIOC_S_FMT ioctls. The VIDIOC_S_FMT ioctl is a major turning-point in the initialization sequence. Prior to this point multiple panel applications can access the same device concurre..

IOCTL For using V4L2, learn about ioctl. What's ioctl? ioctl is abbreviation of Input/Output Control. In computing, ioctl is a system call for device-specific input/output operations and other operations which is can not be expressed by regular system calls. * ioctl definition * /* Perform the I/O control operation specified by REQUEST on FD. One argument may follow; its presence and type depend..

Video For Linux Two(V4L2) is a video capture application programming interface for Linux, supporting many USB webcams, TV tuners, and other devices. V4L2 is closely integrated with the Linux kernel. Video4Linux was named after Video for Windows(which is sometimes abbreviated "V4W"), but is not technically related to it. If you connect the right device, "video0" will appear in "/dev" directory. S..

너무 기뻐서 글을 안쓸수가 없다. 드디어... 마침내.... 며칠동안 고생한 결과가 나왔다. 200줄도 안되는 코드 주제에 나를 애먹이다니. 캬~ 기분좋다. 새벽4시에.... 아아아ㅏ아아아아아아 기쁘다...낭러ㅏ널ㄴ리너ㅏ런라ㅣㅓㅁ나ㅣ러ㅏㅣ널ㅇ ㄹ내러나ㅣ러ㅣ너라ㅣ널나ㅣㅓ라ㅣ넝리ㅓ리ㅏㅓ나ㅓ라ㅣ너아ㅣ러나ㅣㅓ라너ㅏㅣㅇ러ㅏㅓ읾ㄴ ㅇ러ㅏㅣㅁ너리ㅓ지러ㅏㅣ러ㅣ정리저ㅑㅐ덕랴ㅓㄹ나ㅓ리나ㅣ러ㅣㅏ너라ㅣㅓ니러ㅣㄴㅇ러ㅓㅁㄴㄹ 넝ㄹ멍라ㅣㅓㅣ낭러ㅏㅣㅇ러ㅏㅣ언리ㅓ니ㅏ러ㅏㅇ러ㅣ널 ㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ..